Electronic Products Research Articles

High power density redox-mediated Shewanella microbial flow fuel cells

Microbial fuel cells utilize exoelectrogenic microorganisms to directly convert organic matter into electricity, offering a compelling approach for simultaneous power generation and wastewater treatment. However, conventional microbial fuel cells typically require thick biofilms for sufficient metabolic electron production rate, which inevitably compromises mass and charge transport, posing a fundamental tradeoff that limits the achievable power density (<1 mW cm−2). Herein, we report a concept for redox-mediated microbial flow fuel cells that utilizes artificial redox mediators in a flowing medium to efficiently transfer metabolic electrons from planktonic bacteria to electrodes. This approach effectively overcomes mass and charge transport limitations, substantially reducing internal resistance. The biofilm-free microbial flow fuel cell thus breaks the inherent tradeoff in dense biofilms, resulting in a maximum current density surpassing 40 mA cm−2 and a highest power density exceeding 10 mW cm−2, approximately one order of magnitude higher than those of state-of-the-art microbial fuel cells.

Facile recycling of porous Si waste for stable Si/C anodes

As the rapid development of photovoltaic industry, vast of polycrystalline Si has been produced for photovoltaic products. Meanwhile, large amount of Si waste is generated from mechanical slicing process and retired electronic products. Reasonable recycling the Si waste can save resources and reduce environmental pollution. Herein, porous Si is prepared from Si waste by magnesium thermal reduction and then embedded in industry lignin alkali-based carbon matrix (LAC) via co-precipitation and sintering process to obtain Si/C composite anode for lithium-ion batteries. Owing to the encapsulation structure, the carbon matrix can alleviate the volumetric expansion of Si and improve electronic conductivity of composite, the obtained Si@LAC anode exhibits high charge capacity of 1017.5 mAh g−1 at 0.1 A g−1 and high capacity retention of 94.9 % at 0.5 A g−1 after 200 cycles. Furthermore, the Si@LAC composite displays superior rate performance with high capacity of 596.7 mAh g−1 at 2 A g−1 which is 61.5 % of the value at 0.2 A g−1. Such a high performance Si/C anode from facile preparation demonstrates a viable route to utilization of photovoltaic Si waste and industrial lignin.

A Study of Group Work Intervention on Children’s Concentration in Lower Grades: A Case Study of Children’s Concentration Enhancement Group in Elementary Schools

According to the survey on the concentration level of children in the lower grades, the results show that most of the children have concentration deficits. Concentration ability plays a crucial role in children’s intellectual development. With the continuous development of science and technology, different types of electronic products are emerging, which will undoubtedly create a great temptation for children. This hinders the development of children’s ability to concentrate, which not only affects the development of their own ability but also poses a threat to their future development. Therefore, it becomes an essential course to improve children’s ability to concentrate. This paper adopts research methods such as participant observation method and interview method, based on social learning theory, social support theory, and other related theories, through the J City social work service agency selected six children in the lower grades who are not focused and voluntarily participate in this activity into group activities, analyzed the practical effect of group work intervention in the lower grades concentration and problems from the practical point of view. On this basis, corresponding countermeasures are proposed to improve the quality of group intervention services. This paper found that the practical effects of group work intervention on children’s concentration in the lower grades include: improving children’s concentration, promoting children’s self-knowledge, and enhancing children’s self-confidence. Problems include insufficient parental participation and insufficient peer group social interaction. The following countermeasures are proposed: building a platform for peer interaction to improve children’s concentration; constructing a social support network for children with the participation of multiple parties; social workers clarifying their own role positioning and flexibly switching their roles; and enhancing their professional competence and strengthening their practical work skills.

Strong and tough anisotropic short-chain chitosan-based hydrogels with optimized sensing properties for flexible strain sensors

Conductive hydrogels are ideal candidates for developing flexible electronic devices, but they still cannot exhibit excellent strength, satisfactory toughness and high conductivity in sync, greatly limiting their further applications. Inspired by the structure-enhanced properties of natural tissues, we adopted a straightforward and efficient methodology for constructing strong and tough anisotropic short-chain chitosan-based hydrogels with salting-assisted tensile remodeling treatment. The anisotropic hydrogels present anisotropic mechanical and electrochemical performance due to the oriented arrangement of chitosan and P(AM-AA) macromolecular networks. The remarkable tensile strength, toughness, and conductivity of parallel-oriented hydrogels are up to 9.01 MPa, 32.77 MJ/m3, and 692.30 mS/m, respectively, which are much higher than that of isotropic and vertical-oriented hydrogels, verifying the structure-optimized mechanical and sensing performance. The anisotropic conductive polypolysaccharide hydrogels are assembled as strain sensors for real-time human movement monitoring, Morse code encryption and decryption transmission, and gesture prediction combined with a machine learning algorithm, providing new inspiration for blossoming strong, flexible electronic products.

Hierarchical MnCo2O4@MnWO4 core-shell nanoarrays on Ni foam as binder-free electrode for asymmetric supercapacitors

Supercapacitors (SCs) are generally perceived as competitive possibilities for portable electronic products due to their exceptionally high power density and extended operational lifespan. Nevertheless, the relatively low energy density remains a crucial obstacle to its widespread application. A hierarchical MnCo2O4@MnWO4 core-shell nanoarrays on nickel foam (NF) was designed and synthesized by utilizing the MnCo2O4 nanosheet array as the backbone and the MnWO4 nanosheet array as the shell via hydrothermal procedure and calcination. The MnCo2O4@MnWO4/NF electrode achieves 1428.5 F g−1 at 1 A g−1 with 97.8 % of its pristine capacity after 4000 cycles. The superior energy storage characteristic is a result of several factors, including the binder-free integrated electrode design, the synergistic effect between MnCo2O4 and MnWO4, and abundant active sites. The assembled asymmetric supercapacitor (ASC) has an energy density of 36.46 Wh kg−1 at 750 W kg−1, and 85.4 % capacity reserved after 5000 cycles.

Introduction of Nicotine Analogue-Containing Oral Pouch Products in the United States.

In 2023, 6-methyl nicotine (6MN), a synthetic nicotine analogue, was introduced in US-marketed electronic cigarette products advertised as exempt from regulation. It is unknown whether the use of 6MN has spread to the oral nicotine pouch product category that has become increasingly popular. Industry reports and the USPTO database were searched for informationon 6-methyl nicotine products. The search terms "Metatine", "Nixotine", "Imotine" and "pouches" were shortlisted and used to identify US-marketed pouch products. Ingredient contents were compared to popular products, and safety warnings and regulatory statements assessed in context with US state and federal regulations. Two US-based brands, "MG" and "Hippotine" pouches, were identified in August 2024, advertised to contain "Imotine"-trademarked 6MN. MG Pouches are marketed in four youth-appealing flavors. "Hippotine"-branded pouches are marketed in two flavors. 6MN contents ranged between 8mg - 25mg with almost identical ingredient lists otherwise. Products list extensive addiction and health warnings, including warnings not to operate vehicles. Vendors state that these are not a tobacco product, implicating that federal and state tobacco regulations do not apply. The spread of nicotine analogues to additional product categories such as oral pouches is concerning, especially given the high 6MN contents that exceed nicotine contents in popular US-marketed oral nicotine pouch products. Legislators and regulators need to provide certainty about the regulatory status of nicotine analogues to prevent further erosion of tobacco flavor bans and other regulations.

Innovating Sustainability: Digital Marketplaces as Catalysts for Circular Economy in Electronic Device Reuse

This study delves into the synergy between innovation management, the circular economy, and the development of digital marketplaces, with a particular focus on the reuse of electronic devices. It highlights how digitalisation within the circular economy can spur innovation in managing the reuse of electronic gadgets through digital platforms. Drawing on a robust quantitative analysis of data from over 400 Finnish and Baltic companies, this research is pioneering in its holistic integration of these sectors, addressing the critical need for insights into the operational and managerial dynamics of circular economy digital marketplaces. Employing a comprehensive quantitative approach, our investigation uncovered significant insights regarding the perceived opportunities, challenges, and value-added features of these marketplaces for electronic device reuse. Environmental protection, cost savings, and enhanced recycling opportunities were identified as major advantages by participants. However, the study also pointed out significant barriers to effective marketplace operation, including IT system integration, organisational culture challenges, and resource limitations. A noteworthy contribution of this research is its elucidation of the influence of company size on engagement in the circular economy, pinpointing large and micro-enterprises as potential pioneers in this domain. It also sheds light on the business-to-business (B2B) dynamics within digital marketplaces, exploring the interactions among sellers, buyers, and service providers. Our findings underscore digital marketplaces as pivotal enablers for sustainable practices in electronic device reuse, whereas digital platforms may expedite the transition towards a circular economy. This aligns with principles of innovation management by promoting collaboration, minimising waste, and fostering new business models. The conclusion emphasises the digital marketplace not just as a platform for transactions but as a vital ecosystem enabler, providing a wide array of value-added services. It underscores the importance for businesses, especially in the electronics sector, to integrate circular economy principles strategically, leveraging digital marketplaces to achieve sustainability goals while gaining competitive advantages. The research has directly influenced the launch of a pilot digital marketplace for electronic product reuse, showcasing the practical application of its findings. This emphasises the study’s role in advancing innovation management practices by demonstrating the transformative potential of digital marketplaces in promoting circular economy practices.

EXPRESS: From Stars to Dogs – Identifying “Out-Of-Favor” Products on E-Commerce Platforms? Data Analytic Approach to System Design

Online retail platforms are increasingly challenged by the proliferation of low-quality products, which may damage their reputation and sales. To address this problem, we propose a system architecture to proactively identify products that are likely to go "out of favor". Our approach uses historical data to extract useful information from customer ratings and textual reviews. Available data are fed into a state-of-the-art deep learning sequence model to forecast future ratings. We then analyze rating trends, extracting hyperparameters that a binary classifier uses to label products as "out of favor" or not. We tested this system on an Amazon dataset comprising nearly 800,000 observations across 2,826 electronics products. Our results show that the Long Short-Term Memory (LSTM) model excels in forecasting future product ratings compared to other benchmarks. Ablation analysis shows sentiment-related features significantly improve rating forecasts by up to 40%, with review topics adding 10% and other review characteristics 4%. Counterintuitively, topic extraction from reviews does not provide substantial benefits, despite the heavy computational resources it requires. Finally, the two-stage classification process, which leverages time-series data and rating trends, offers a more stable and robust performance than conventional single-stage methods. We provide considerations for system architecture development through robustness checks ensuring its resilience to stressors. Our experiments indicate that rating trends can change in subtle ways over time, leading a promising “star” product to turn into a liability (“dog”). E-commerce platforms can use the proposed system architecture proactively to identify and remove potentially dubious products instead of waiting to take reactive action.

Stress-induced warpage estimation of advanced semiconductor copper interconnect processes

The growth of the semiconductor industry is driven by the demand for electronic products and high transistor density. However, complex manufacturing processes generate residual stress and result in wafer warpage. Therefore, mastering wafer warpage has become a crucial challenge. This study proposes a process-oriented simulation methodology with simulation-based equivalent material method to overcome the difficulty of finite element modeling and the substantial amount of computation time. Three different methodologies, including volume percentage, representative volume element, and Timoshenko bi-material approach, are discussed due to the estimation of residual stress for equivalent material. In addition, each methodology is validated through process-oriented simulations and comparison with measurement data. The Timoshenko bi-material approach is efficient in predicting warpage in the back end of line (BEOL) interconnects and provides a comprehensive understanding of the warpage variation that occurs during different stages of BEOL.

MXene quantum dots modified pitaya peel-based composite phase change material with excellent thermal properties for building energy efficiency applications

Bio-based materials have attracted much attention because their application in the construction field is conducive to energy saving and emission reduction. In this paper, a bio-based composite phase change material (CPCM) was prepared by utilizing pitaya peel as a bio-based material, MXene quantum dots (MQDs) as a modified material, and polyethylene glycol (PEG) as a phase change medium. MXene quantum dots dispersed in the pitaya peel-based porous carbon skeleton enhanced the three-dimensional thermal conductivity network of the porous carbon skeleton somewhat improved the thermal conductivity (0.676 W/mK) of the polyethylene glycol/MXene quantum dots-modified pitaya peel-based porous carbon foam (PPF) composite phase change material (PEG/PPF@M). It is worth noting that PEG/PPF@M has excellent thermal stability and its enthalpy is basically unchanged after 100 cycles, which proves the recyclable stability of PEG/PPF@M in practical applications. PEG/PPF@M has great potential for thermal management of buildings and electronic components. Overall, a novel multifunctional CPCM was prepared in this study using a simple process method, which can not only be applied in electronic products to improve the service life of electronic components, but also in the field of construction to realize energy saving and emission reduction, as well as the recycling and reuse of waste.

Who drives the green shift? EV and battery policymaking and systemic marginalisation of auto suppliers in South Korea

The swift global transition to electric vehicles (EV) and batteries in the automotive industry highlights the nature of governments’ efforts towards a green economy, marking a transition from environmental regulations to industrial policies. This shift has led to renewed interest in industrial policies, especially in East Asian developmental states, like South Korea. The EV and battery industries in South Korea have grown rapidly along with the government's efforts to mobilise the entire economy through aggressive green industrial policy, particularly during the Lee Myung-bak administration (2008–2012). Big Korean automobile and electronics manufacturers have participated directly in setting the country's industrial agenda, leading the green industrial policy with their business interests. However, the process of EV and battery policymaking also marginalized auto suppliers in the existing manufacturing sector from agenda setting. Focusing on business’ structural power, this paper explains how big business elites systematically alienate small and medium-sized suppliers from the new growth policy thanks to their strong information monopoly in the hierarchical structure of production in the automobile industry and EV policies in South Korea.

Collaborative interface optimization strategy guided Fe3C/MnO-NC electrocatalysts for rechargeable flexible zinc-air batteries

The flexible zinc-air batteries characterized by heightened flexibility, durability, and high electrochemical performance have been recognized as the most promising candidates for the next-generation wearable electronic products. Herein, a novel Fe3C/MnO heterostructure coupled with nitrogen-doped carbon (Fe3C/MnO-NC) derived from metal-organic frameworks (MOFs) is innovatively designed as a highly active bifunctional electrocatalyst. The Fe3C/MnO heterostructure in Fe3C/MnO-NC can effectively regulate the electronic structure to optimize the free energy of the related intermediates in the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), consequently improving the catalytic properties of liquid Zn-air battery with impressive power density and outstanding stability. The theoretical calculations reveal that the design of the heterogeneous Fe3C/MnO interface effectively tunes the electron distribution to optimize the adsorption energy of ORR/OER related intermediates and significantly promotes intrinsic ORR/OER activities. Notably, the flexible Zn-air battery was also assembled with the bifunctional Fe3C/MnO-NC electrocatalyst and the prepared polyacrylamide polyacrylic acid-glycerin composite gel polymer electrolyte (PAM-PAA-Gly GPE). The electrochemical results reveal that the constructed flexible Zn-air battery can achieve a remarkable open-circuit voltage of 1.50 V and sustain stable cycling for 48 h (288 cycles). This work not only sheds light on the effective utilization of Fe3C/MnO-NC catalysts but also highlights the potential of hydrogels in achieving high-performance wearable Zn-air batteries.

Modelling the Behaviour of Millennials towards the Adoption of Mobile E-Money Services in National Capital Region of the Philippines using Structural Equation Modelling

This study investigates the behavioural intention of millennials towards the adoption of mobile e-money services. The Theory of Planned Behaviour as the theoretical foundation with Attitude, Subjective Norms, and Perceived Behavioural Control variables and Structural Equation Modelling as the modelling technique were employed to identify what factor(s) influence the millennial’s behavioural intent. A combined online and paper-and-pencil survey form was employed to assess how electronic banking through the use of mobile e-wallets is perceived by the millennials residing in the National Capital Region of the Philippines. The sociodemographic profile of the respondents and their banking experiences, including their access to financial products and services, are other goals of this study. The research concludes that millennials’ attitude and perceived behavioural control have a significant impact on their intent to adopt mobile e-money services, and the majority have access to financial products and services. The millennials’ subjective norms have a positive effect, but it is not significant. Additionally, the respondents’ gender and whether they own a bank account or not were used for moderation analysis. The research findings showed that both variables do not have a significant effect on the links between variables. Results of this research could guide the financial regulatory bodies in their policy-making activities, the users of electronic financial products in their financial endeavours, and the government, ultimately, to achieve its financial goals.

A self-healing composite solid electrolyte with dynamic three-dimensional inorganic/organic hybrid network for flexible all-solid-state lithium metal batteries

Composite solid electrolytes (CSEs), which combine the advantages of solid polymer electrolytes and inorganic solid electrolytes, are considered to be promising electrolytes for all-solid-state lithium metal batteries. However, the current CSEs suffer from defects such as poor inorganic/organic interface compatibility, lithium dendrite growth, and easy damage of electrolyte membrane, which hinder the practical application of CSEs. Herein, a CSE (PBHL@LLZTO@DDB) with polyurethane (PBHL) as the polymer matrix and Li6.4La3Zr1.4Ta0.6O12 (LLZTO) modified by silane coupling agent (DDB) as inorganic fillers (LLZTO@DDB) has been prepared. Disulfide bond exchange reactions between PBHL and LLZTO@DDB enable PBHL@LLZTO@DDB to form a dynamic three-dimensional (3D) inorganic/organic hybrid network, which promotes the uniform dispersion of LLZTO in PBHL@LLZTO@DDB, improves the Li+ conductivity (1.24 ± 0.08 × 10−4 S cm−1 at 30 ℃), and broadens the electrochemical stability window (5.16 V vs. Li+/Li). Moreover, a combination of hydrogen bonds and disulfide bonds endows PBHL@LLZTO@DDB with excellent self-healing properties. As such, both all-solid-state symmetric and full cells exhibit excellent cycle performance at ambient temperature. More importantly, the healed PBHL@LLZTO@DDB can almost completely restore its original electrochemical properties, indicating its application potential in flexible electronic products.

Radial dependence of ionization clustering around a gold nanoparticle irradiated by X-rays under charged particle equilibrium

Objective.This work explores the enhancement of ionization clustering and its radial dependence around a gold nanoparticle (NP), indicative of the induction of DNA lesions, a potential trigger for cell-death.Approach.Monte Carlo track structure simulations were performed to determine (a) the spectral fluence of incident photons and electrons in water around a gold NP under charged particle equilibrium conditions and (b) the density of ionization clusters produced on average as well as conditional on the occurrence of at least one interaction in the NP using Associated Volume Clustering. Absorbed dose was determined for comparison with a recent benchmark intercomparison. Reported quantities are normalized to primary fluence, allowing to establish a connection to macroscopic dosimetric quantities.Main results.The modification of the electron spectral fluence by the gold NP is minor and mainly occurs at low energies. The net fluence of electrons emitted from the NP is dominated by electrons resulting from photon interactions. Similar to the known dose enhancement, increased ionization clustering is limited to a distance from the NP surface of up to200nm. The number of clusters per energy imparted is increased at distances of up to150nm, and accordingly the enhancement in clustering notably surpasses that of dose enhancement. Smaller NPs cause noticeable peaks in the conditional frequency of clusters between50nm-100nmfrom the NP surface.Significance.This work shows that low energy electrons emitted by NPs lead to an increase of ionization clustering in their vicinity exceeding that of energy imparted. While the electron component of the radiation field plays an important role in determining the background contribution to ionization clustering and energy imparted, the dosimetric effects of NPs are governed by the interplay of secondary electron production by photon interaction and their ability to leave the NP.

Tailoring Mechanical and Optical Properties of Sputtered SiNx/BN Coatings.

The swift evolution of contemporary electronics products, such as flexible screens and wearable electronic devices, highlights the significance of flexible protective coatings, which combine superior mechanical and optical properties. Even though the recently developed polymer protective coatings can satisfy requirements for flexibility and transparency, their intrinsic nature often results in a hardness below 1 GPa, rendering them susceptible to scratches. On the other hand, traditional inorganic coatings, known for their high hardness and transparency, fall short of meeting flexibility requirements. In the present study, a SiNx/BN periodical nanolayered coatings (PNCs) structure has been tailored to achieve high mechanical durability, transparency, and flexibility. In SiNx/BN PNCs, the optical and mechanical properties of the single-layer SiNx film are crucial to the overall performance of the PNCs. Therefore, pulse direct current (DC) magnetron sputtering was optimized first to enhance the ionization efficiency of Si and N, thereby promoting their reaction and diminishing the presence of elemental silicon in SiNx. The effects of the pulse frequency and duty cycle on SiNx were evaluated. Additionally, the influence of the thickness ratio and modulation periods on the overall performance of the SiNx/BN PNCs was investigated. As a result, a SiNx/BN coating with sapphire-grade hardness, almost no optical absorption in the visible-near-infrared (vis-NIR) range, high wear resistance, and exceptional flexibility was demonstrated.

From e-waste to living space: Flame retardants contaminating household items add to concern about plastic recycling

Brominated flame retardants (BFRs) and organophosphate flame retardants (OPFRs) are commonly used in electric and electronic products in high concentrations to prevent or retard fire. Health concerns related to flame retardants (FRs) include carcinogenicity, endocrine disruption, neurotoxicity, and reproductive and developmental toxicity. Globally, a lack of transparency related to chemicals in products and limited restrictions on use of FRs in electronics have led to widespread use and dissemination of harmful FRs. Despite the lack of transparency and restrictions, plastics from electronics are often recycled and can be incorporated in household items that do not require flame retardancy, resulting in potentially high and unnecessary exposure. This study sought to determine whether black plastic household products sold on the U.S. market contained emerging and phased-out FRs and whether polymer type was predictive of contamination. A total of 203 products were screened for bromine (Br), and products containing >50 ppm Br were analyzed for BFRs, OPFRs, and plastic polymers (e.g. acrylonitrile butadiene styrene, high impact polystyrene, polypropylene). FRs were found in 85% of analyzed products, with total FR concentrations ranging up to 22,800 mg/kg. FRs detected include the restricted compound deca-BDE, which was used widely in electronics casings, as well as its replacements decabromodiphenyl ethane (DBDPE) and 2,4,6-Tris(2,4,6-tribromophenoxy)-1,3,5-triazine (TBPP-TAZ) along with associated compound 2,4,6-tribromophenol (2,4,6-TBP), recently detected in breast milk. Plastic typically used in electronics (styrene-based) contained significantly higher levels of ∑FRs than plastics less typically used for electronics (polypropylene and nylon). Estimation of exposure to BDE-209 from contaminated kitchen utensils indicated users would have a median intake of 34,700 ng/day, exceeding estimates for intake from dust and diet. The detection of FRs in collected household products indicates that recycling, without the necessary transparency and restrictions to ensure safety, is resulting in unexpected exposure to toxic flame retardants in household items.

Study on chloride attack resistance of concrete with lithium slag content

The demand for lithium batteries in electronic products is constantly increasing, and a large amount of solid waste is generated during the production of lithium batteries. These wastes are not only harmful to the environment, but more importantly, the cost of processing the wastes is very high. To reduce the harm caused by lithium slag waste and increase the chloride ion penetration resistance of concrete, this paper designs C20, C30, C40, and C60 concrete with lithium slag contents of 0 %, 10 %, 20 %, and 30 %. The effects of different lithium slag contents on the compressive strength, electric flux, and porosity of concrete specimens were studied. The study found that for C20, C40, and C60 concrete, the compressive strength decreases with the increase of lithium slag content. For C30 concrete, the compressive strength shows a trend of increasing first and then decreasing with the increase of lithium slag content. For the electric flux of C20, C30, and C40 concrete, it shows a trend of decreasing with the increase of lithium slag content. For the porosity of C20, C30, and C40 concrete, it shows a trend of first decreasing and then increasing with the increase of lithium slag content. Combining Fick's second law and the law of conservation of mass, a chloride ion penetration model of lithium slag concrete under the action of different lithium slag contents was established. The results show that the penetration performance of chloride ions in the immersion environment conforms to the experimental law; the maximum error between the simulation results and the test results is at 360 min of C30-30LS, and the error value is 14.49 %.

Steady and transient modeling of dye-sensitive solar cells: The impact of electrode thickness and dye specifications

Investigating the impact of dye compounds on cell performance is crucial for advancing dye-sensitized solar cells (DSSCs). This research focuses on the sensitivity analysis of the effect of critical parameters to enhance DSSC efficiency using a thermo-electric numerical model. These parameters include dye types, trapping parameters, diffusion coefficients, and photoanode thickness. When the type of dye changes, in fact, both physical and chemical properties (molar absorption coefficient, etc.) Change, but to avoid the complexity of solving the equations and only to evaluate the effect of the absorption wavelength range on the cell performance only changes in physical properties are considered. The model calculates steady and transient currents under actual weather conditions and sunlight. It incorporates time/space-dependent relationships for increased accuracy and examines electron, iodide, and triiodide ion interactions under varying environmental conditions. Key concepts include the quasi-Fermi level and the multiple trap model, assuming that trapping processes are faster than electron transport and recombination. The results showed that increasing the trapping parameter can affect the transient current behavior, also increasing the thickness of the photoanode and the wavelength range of the dye increases the efficiency of the cell, so that the N749-BD provides the best performance. The findings provide insights into current–voltage characteristics, electron production, and the effects of photoanode thickness and dye types on cell performance, offering pathways for optimizing DSSC technology.

Single Site W(0) versus Re(I)‐Dipyridophenazine‐ Based Conjugated Porous Polymer for CO2 Photoreduction

Herein, the synthesis and characterization of two robust tungsten and rhenium carbonyl complexes integrated into an organic polymer (CPP‐Re, CPP‐W) are reported. These polymers are obtained by a Suzuki coupling reaction between the corresponding dibromo metal‐carbonyl substituted dipyrido[3,2‐a:2′,3′‐c]phenazine complex and 1,3,5‐triphenylbenzene‐4′,4″,4″,4‴‐triboronic acid and integrated catalytic active sites and photosensitizer since they have not only nitrogen sites to coordinate metal active centers as rhenium or tungsten but photoactive units with good charge‐separating ability which can significantly improve the CO2 photoreduction reaction (CO2PRR). These polymers show similar activity in solid–gas CO2PRR in absence of sacrificial agents to produce syn gas (CO + H2) but CPP‐W selectivity to products change regarding CPP‐Re being able to produce also large amount of more demanding electron products such as methane and ethane. Moreover, the single‐site Re‐ or W‐CPP catalysts could prevent the dimerization of complexes that produces its deactivation. This work shows the potential of CPPs as matrices to support single active centers for heterogeneous catalysis.