Bimetallic Metal-organic Frameworks Research Articles

Facile Synthesis of Cu–Zn Bimetallic MOF: Application as Superior Adsorbent for Effective Removal of Methylene Blue from Aqueous Solutions

Facile Synthesis of Cu–Zn Bimetallic MOF: Application as Superior Adsorbent for Effective Removal of Methylene Blue from Aqueous Solutions

Enriched Se vacancies engineering of RuSe2 induced by low-valence Cu doping for promoting hydrogen evolution and coupling power generation

Heteroatom doping and vacancy engineering play vital roles in designing a high-activity electrocatalyst. Herein, we proposed a novel enriched Se vacancies engineering of the promising ruthenium chalcogenide of RuSe2 induced by low-valence Cu doping for promoting hydrogen evolution reaction (HER) electrocatalysis in alkaline media. The Cu-doped RuSe2 with enriched Se vacancies supported on graphitized carbon (Cu-RuSe2@C) was synthesized by a simple one-step selenization of bimetallic MOF precursor of Ru/Cu-BTC (1,3,5-benzenetricarboxylic acid) polyhedra. Compared to the Cu(Ⅱ)-dominant doped RuSe2 (CuⅡ/Ⅰ-RuSe2@C) with deficient Se vacancies, the proposed Cu(Ⅰ)-dominant doped RuSe2 (CuⅠ/Ⅱ-RuSe2@C) with enriched Se vacancies exhibited significantly improved electrocatalytic activity, which was potentially derived from the created electron-deficient Ruδ+ and Seν− sites induced by low-valence Cu doping. Specifically, CuⅠ/Ⅱ-RuSe2@C needed only 40 mV overpotential to drive a HER current density of 10 mA cm−2, comparable to commercial Pt/C (38 mV) and much lower than those of CuⅡ/Ⅰ-RuSe2@C (93 mV) and RuSe2@C (362 mV). Furthermore, an alkaline Zn-H2O fuel cell with a CuⅠ/Ⅱ-RuSe2@C cathode was integrated to demonstrate its potential applications, which delivered a maximum power density of 15.1 mW cm−2 and specific capacitance of 660 mAh g−1 with good stability. Two series-connected alkaline Zn-H2O cells acted as a chemical energy converter for simultaneous electricity generation and hydrogen coproduction by driving the coupled water splitting.

Bimetallic Porphyrin-Based Metal-Organic Framework as a Superior Photocatalyst for Enhanced Photocatalytic Hydrogen Production.

The meaningful and rational engineering of porphyrin-based catalysts with multimetallic active sites is very attractive toward photocatalytic hydrogen generation from water decomposition. Herein, three metal organic frameworks (MOFs) based on meso-tetrakis(4-carboxylphenyl)porphyrin (TCPP) were successfully constructed under solvothermal conditions. As a novel architectured photocatalyst (triclinic, C48H29N4O10PdYb), Pd/Yb-PMOF manifested diverse metal active sites, suitable bandgap positions, prominent visible light-collecting capacity, excellent carrier transfer efficiency, and obvious synergistic effect between ytterbium and palladium ions. Consequently, such a bimetallic MOF exhibited strengthened photocatalytic hydrogen evolution performance. Concretely, its hydrogen generation efficiency was up to 3196.42 μmol g-1 h-1 with 2 wt % Pt as a cocatalyst under visible light illumination. Our work demonstrates a promising strategy for highly efficient visible-light catalysts based on bimetallic-trimmed porphyrin MOFs.

Manganese-based microcrystals equipped with Ythdf1-targeted biomimetic nanovaccines for reinforced dendritic cell spatiotemporal orchestration

Undesired dendritic cell (DC) spatiotemporal orchestration and innate immune stimulation severely dampens anti-tumor efficacy of cancer vaccines. Here, we develop a manganese-based (Mn2+) metal-organic framework (MOF) microcrystal equipped with Ythdf1-targeted biomimetic nanovaccines to create an in situ proinflammatory immune niche for augmented DC spatiotemporal orchestration. The bimetallic MOF microcrystal serves as a self-adjuvanting delivery platform that cannot only gradually release tumor-associated antigens and Mn2+, but also create an in situ immune niche for DC spatiotemporal orchestration including recruitment (particularly for DC1s, cross-presenting antigens to CD8+ T cells), activation, and lymph node migration. Benefitting from the Mn2+-mediated cGAS-STING activation together with Ythdf1 downregulation-induced antigen cross-presentation reinforcement, the vaccines elicit robust prophylactic efficacy for delaying B16-OVA and MC38 tumor occurrence, and show potent therapeutic efficacy for suppressing postoperative MC38 tumor recurrence and metachronous liver metastasis. Our study provides a versatile and powerful approach for fabricating personalized scaffold cancer vaccines.

Engineering Platelet Membrane-Coated Bimetallic MOFs as Biodegradable Nanozymes for Efficient Antibacterial Therapy.

Nanocatalytic-based wound therapeutics present a promising strategy for generating reactive oxygen species (ROS) to antipathogen to promote wound healing. However, the full clinical potential of these nanocatalysts is limited by their low reactivity, limited targeting ability, and poor biodegradability in the wound microenvironment. Herein, a bio-organic nanozyme is developed by encapsulating a FeZn-based bimetallic organic framework (MOF) (MIL-88B-Fe/Zn) in platelet membranes (PM@MIL-88B-Fe/Zn) for antimicrobial activity during wound healing. The introduction of Zn in MIL-88B-Fe/Zn modulates the electronic structure of Fe thus accelerating the catalytic kinetics of its peroxidase-like activity to catalytically generate powerful ROS. The platelet membrane coating of MOF innovatively enhanced the interaction between nanoparticles and the biological environment, further developing bacterial-targeted therapy with excellent antibacterial activity against both gram-positive and gram-negative bacteria. Furthermore, this nanozyme markedly suppressed the levels of inflammatory cytokines and promoted angiogenesis in vivo to effectively treat skin surface wounds and accelerate wound healing. PM@MIL-88B-Fe/Zn exhibited superior biodegradability, favourable metabolism and non-toxic accumulation, eliminating concerns regarding side effects from long-term exposure. The high catalytic reactivity, excellent targeting features, and biodegradability of these nanoenzymes developed in this study provide useful insights into the design and synthesis of nanocatalysts/nanozymes for practical biomedical applications.

Component modulation and integrated multidimensional heterostructures of bimetallic MOFs derived 0D Co3ZnC/Co encapsulated in 2D CNTs-grafted 3D N-doped porous carbon polyhedron for high-efficient microwave absorption

Component modulation and multidimensional structural design are effective strategies to regulate the electromagnetic parameters and impedance matching, resulting in high-efficient microwave absorption. Herein, multidimensional integrated Co3ZnC/Co@C heterostructures compounding of 0D Co and Co3ZnC NCs, 1D CNTs and 3D porous carbon polyhedrons were fabricated by pyrolysis of bimetallic MOFs. Co and Co3ZnC NCs are uniformly encapsulated in CNTs-grafted porous carbon polyhedrons, forming 0D-1D-3D integrated heterostructures. The Co3ZnC/Co@C composites show component-modulated electromagnetic parameters and microwave absorption properties, which can be simply regulated by adjusting the ratio of Co/Zn in the MOFs precursor. With a filling ratio of 30 wt%, the optimal Co3ZnC/Co@C heterostructures show a minimum reflection loss (RL) value of −66.78 dB at 7.43 GHz with a thickness of 4.5 mm, located at the C band. The maximum effective absorption bandwidth (RL≤−10 dB) is up to 4.8 GHz (12.9–17.7 GHz) at only 2.0 mm. The high-efficient microwave absorption performance is attributed to that the multidimensional integrated heterostructures can sufficiently maximize the synergistic effects of each component. The uniformly distributed 0D Co and Co3ZnC NCs can promote magnetic loss and interfacial polarization. 1D CNTs are beneficial to enhance the conductive loss. 3D porous carbon polyhedrons grafted with CNTs are favored to promote the scattering of microwaves and impedance matching. These findings suggest a new insight to achieve high-performance microwave absorption by modulating the component and integrating multidimensional structures.

Ultra-Trace Electrochemical Determination of Glyphosate Using Bimetallic Metal–Organic Frameworks (MOFs) with Differential Pulse Voltammetry

Hierarchically bimetallic Zr-Cu metal–organic framework combined with 1,3,5-benzenetricarboxylic acid (Zr-CuBTC MOFs) was synthesized using hydrothermal reaction and used as modifier for investigation of non-electroactive glyphosate. These MOFs were dropcasted on a glassy carbon electrode (GCE) and non-electroactive glyphosate were tested by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Glyphosate in water was recognized by the difference of currents in spiked and non-spiked glyphosate samples. At the same time, CuBTC and Fe-CuBTC were investigated for the best material for sensor development. The results showed the bimetallic Zr-CuBTC MOF is the most promising for the determination of glyphosate. Morphological and structural studies showed the coordination of Cu2+ with the presence of Zr4+ ions with BTC ligands provided a highly porous framework with active surface area up to 1337 m2 g−1. The pore diameter and pore volume increased to 1.75 nm and 0.687 cm3 g−1, respectively. Under optimal conditions, Zr-CuBTC modified on GCE (Zr-CuBTC/GCE) sensor is able to indirectly detect glyphosate in a water environment at a detection limit as low as 9 × 10−13 M. The developed sensor was employed to determine glyphosate in the surface water samples collected from the Red River, North Vietnam. The results showed good recoveries (94.6–107.1%) which were in agreement with liquid chromatography coupled tandem mass spectrometry (LC-MS/MS) measurements. These results demonstrate the possibility of using this MOF material in sensor applications to determine trace pesticides in the contaminated water.

Bimetallic metal-organic framework as a high-performance peracetic acid activator for sulfamethoxazole degradation

A novel 3D bimetallic metal-organic framework (MOF(Fe–Co)) was successfully prepared and its performance on sulfamethoxazole (SMX) removal in advanced oxidation process (AOP) based on peracetic acid (PAA) was evaluated. MOF(Fe–Co) exhibited an efficient catalytic performance on PAA activation for SMX degradation under neutral condition. Increasing PAA concentration could enhance SMX removal, while the variation of MOF(Fe–Co) dosage from 0.05 to 0.2 g/L had an inappreciable effect on SMX removal. According to the results of inductively coupled plasma mass spectrometry analyses and X-ray photoelectron spectroscopy, catalytic reactions mainly occurred on the surface of MOF(Fe–Co). Organic radicals (i.e., CH3C(O)OO• and CH3C(O)O•) were demonstrated to be the predominant reactive radicals for SMX degradation by MOF(Fe–Co)/PAA through radical quenching experiments. The presence of Cl− could enhance the degradation of SMX by MOF(Fe–Co)/PAA, while HCO3− and natural organic matter inhibited SMX degradation severely. Five identified degradation products were detected in this system and four possible SMX transformation pathways were proposed, including amino oxidation, S–N bond cleavage, coupling reaction and hydroxylation.

Enhancing ibuprofen degradation in aqueous solutions: The synergistic role of bimetallic MOFs (Mn/ZIF-67) and modified graphene oxide in peroxymonosulfate activation

An innovative bimetallic (Co and Mn) composite catalyst, Mn/ZIF-67@GO, was synthesized for effective peroxymonosulfate (PMS) activation and rapid degradation of ibuprofen (IBP). The Mn/ZIF-67@GO/PMS system demonstrates remarkable catalytic performance, achieving a 98 % degradation of a 0.05 mM IBP solution within 15 min. This high efficiency is maintained across a pH range of 5 to 9, with excellent system stability over five cycles, showing only minimal metal leaching (Co and Mn < 50 µg/L). The system's versatility is further proven by its ability to remove over 80 % of other antibiotics tested. Additionally, a detailed mechanism study has identified 5 degradation pathways and 19 intermediates of IBP, offering deep insights into the catalytic process. Our findings underscore the potential of MOFs in advanced water treatment applications through PMS activation, presenting a promising approach for antibiotic removal.

Hierarchical bimetallic metal-organic frameworks with controllable assembling sub-units and interior architectures for enhanced ammonia detection

A series of hierarchical three-dimensional (3D) manganese-cobalt BTC (Mn-Co BTC; BTC = benzene-1,3,5-tricarboxylate ) metal–organic frameworks (MOFs) with controllable sub-units and interior architectures have been synthesized at room temperature without templates, etchants, or high-pressure conditions. The assembling sub-units of the hierarchical 3D Mn-Co BTC MOFs can be controlled by tuning the Mn/Co ratio, with higher Mn content favoring one-dimensional (1D) sub-units, while higher Co content favors two-dimensional (2D) sub-units. The hierarchical hollow Mn-Co BTC spheres (M2C-BTC) exhibit a frequency change (ΔF) of 383.7 Hz to 69.5 ppm of NH3 which is ∼1.7-, 2.1-, 4.2-, and 8.3-times higher than the ΔFs of hierarchical Mn-Co BTC nanorods (M1C-BTC), hierarchical flower-like Mn-Co BTC (M0.5C-BTC), Mn-BTC nanospheres, and Co-BTC nanoplates, respectively. In addition, they exhibit low limit of detection (1.12 ppm), high selectivity (41 %) and excellent stability for NH3 sensing with a minor change of 3.1 % in the ΔF value after 5 months of testing. The superior NH3 sensing performance of the hierarchical hollow Mn-Co BTC spheres may be attributed to the hollow cavities which can enhance the adsorption rate of NH3 molecules (based on the adsorption kinetics analysis) and enable them to interact with the less accessible metallic active sites on the inner cores of this MOF. The possible sensing mechanisms include the chemisorption of NH3 molecules on unsaturated metal (Mn and Co) centers as well as the hydrogen bonding between the hydroxyl and carboxyl groups with NH3.

Enhancing carbon dioxide separation from natural gas in dynamic adsorption by a new type of bimetallic MOF; MIL-101(Cr-Al)

This study explores the use of a high surface area nano-adsorbent for selective adsorption and separation of very low concentrations of carbon dioxide from methane. The adsorbent, MIL-101(Cr-Al) with unsaturated metal sites, was prepared by one pot facile hydrothermal method and it was compared with MIL-101(Cr). Characterizations of the synthesized samples were conducted using XRD, FESEM, EDAX, elemental mapping, and BET analyses. Static adsorption experiments were carried out at pressures ranging from close to 1 bar up to 50 bar and at temperatures of 25 and 35 °C. The ideal selectivity of carbon dioxide relative to methane and the isosteric heat of adsorption were also calculated. Results indicated that with the bimetallic modification method, the CO2/CH4 selectivity increased from 5.2 to 5.7 at the pressure of 1 bar and from 8.2 to 8.3 at the pressure of 50 bar and temperature of 35 °C. Dynamic adsorption experiments were conducted for the mixture of CH4, CO2 and He (85 %-5% −10 % mol%). The dynamic selectivity of CO2/CH4 at the pressure of 15 bar with the space time of 1.12 min was increased from 1.82 to 4.2 using bimetallic MIL-101(Cr-Al).

Empowering the Water Oxidation Activity of the Bimetallic Metal-Organic Framework by Annexing Gold Nanoparticles over the Catalytic Surface.

Electrocatalytic water splitting to an anodic oxygen evolution reaction (OER) and a cathodic hydrogen evolution reaction (HER) is believed to be the most important application for sustainable hydrogen generation. Being a four-electron, four-proton transfer process, the OER plays the main obstacle for the same. Therefore, designing an effective electrocatalyst to minimize the activation energy barrier for the OER is a research topic of prime importance. The metal-organic framework (MOF) with a highly porous network is considered an appropriate candidate for the OER in alkaline conditions. Apart from several MOFs, the bimetallic one has an advantageous electrocatalytic performance due to the synergistic electronic interaction between two metal ions. However, most bimetallic MOFs have an obstacle to electrocatalytic application due to their low conductive nature, and therefore, they possess a barrier for charge transfer kinetics at the interface. Surface functionalization via various nanoparticles (NPs) is believed to be the most effective strategy for nullifying the conductive issue. In this work, we have designed a CoNi-based bimetallic MOF that was surface-functionalized by Au NPs (Au@CoNi-Bpy-BTC) for the OER under alkaline conditions. Au@CoNi-Bpy-BTC required an overpotential of just 330 mV, which is 56 mV lower as compared to the pristine MOF. Impedance analysis confirms an improved conductivity and charge transfer at the interface, where Au@CoNi-Bpy-BTC possesses a lower Rct value than CoNi-Bpy-BTC materials. Moreover, the Au-decorated MOF shows an 8.5 times increase in the TOF value compared to the pristine MOF. Therefore, this noble strategy toward the surface functionalization of MOFs via noble metal NPs is believed to be the most effective strategy for developing effective electrocatalysts for electrocatalytic application in energy-related fields. Overall, this report displays an exceptional correlation between the decorated NPs over the MOF surface, which can regulate the OER activity, as confirmed by experimental analysis.

Favosites shaped carbon nanofibers modified by bimetallic Zn-Ni-MOF derivatives loaded with CoS2 as counter electrode material for liquid film dye-sensitized solar cells

Exploring new material structures of dye-sensitized solar cells for electrode materials is one of the important means to improve their performance. The Zn-Ni bimetallic MOF derivatives with coralliform structure are grown on carbon fibers to improve the ion diffusion rate by taking advantage of the structure, and the combination of carbon fibers and MOF derivatives fully improves the conductivity and specific surface area of the counter electrode material, and the loading of CoS2 nanoparticles on surface, together with the redox properties of Zn-Ni-MOF derivatives, make CoS2/Zn-Ni-MOF-D/CNF exhibit a photoelectric conversion efficiency of 10.11% (Pt, 8.73%) in DSSCs, and perform superiorly in the 50-turn CV stability test, while Pt electrode dispersion is obvious and peak position is derailed. This fully confirms that CoS2/Zn-Ni-MOF-D/CNF is a feasible attempt to substitute Pt as counter electrode in DSSCs.

Facile synthesis of Cu-Zn bimetallic metal-organic framework for effective catalyst toward electrochemical reduction of CO2

Bimetallic metal-organic framework (BM) and high temperature BM (HTBM) based catalysts have several advantages, including uniformly distributed bimetallic ions, less tendency towards aggregation, and more stable interfacial sites. In this study, CuZn-MOF were synthesized using ZIF-8 as a template, and then calcination at a high temperature in the nitrogen atmosphere. The electrochemical reduction CO2 (ERC) was taking place on an H-type cell in 0.1 M KHCO3 aqueous solution. The HTBM calcination at 700 °C exhibited excellent electrochemical CO2 reduction properties, including high CO selectivity (∼ 90%) and low overpotential (< −1.5 V)

Electrochemical-driven removal of organic dyes by using bimetallic MOFs /waste cellulose acetate derived carbon foam as a freestanding electrode material

Converting the solid waste into high-value products were significant to environmental protection and resources saving. Waste cigarette filters, were made of cellulose acetate, a common kind of solid waste in daily life. In this work, waste cigarette filters were used as cellulose precursors and decorated with bimetallic MOFs to fabricate a light-weight, monolithic and porous carbon foam. The specific surface area and pore size of as-prepared carbon foams can be regulated through changing the mass ratio of ZIF-8 to ZIF-67. Importantly, as-prepared samples exhibited good electrochemical performances when accessed a great balance between the surface area and conductivity. The sample of C/Zn/Co-0.5:0.5 exhibited an excellent electrosorption capacity for methylene blue, which was high up to 2847 mg g−1. Moreover, it had a superior stability, and the removal efficiency for methylene blue remained above 90 % after 5 cycles. Thus, this study successfully realized the conversion of waste cigarette filters into porous materials, which can be regarded as an effective and economic adsorbent used in wastewater treatment.

A portable sensor for glucose detection in Huangshui based on blossom-shaped bimetallic organic framework loaded with silver nanoparticles combined with machine learning.

In this work, we propose a blossom-like Ni, Co bimetallic metal-organic framework (NiCo-MOF) synthesized hydrothermally and decorated with silver nanoparticles (AgNPs) via chemical reduction for electrochemical enzyme-free glucose sensing. The NiCo-MOF nanostructures had large specific surface area and good sensing performance. The AgNPs enhanced the electrochemical performance of the MOF, resulting in excellent electrochemical activity. The sensor exhibited sensitivities of 1191.84 and 271.19 μA mM-1 cm-2 in the linear ranges of 0.005-1.125 and 1.525-5.325mM, respectively, with a detection limit of 2.3μM. The sensor was successfully applied for glucose determination in Huangshui (HS) using an artificial neural network as machine learning (ML) model. The R2 value near 1, low RMSE, and high RPD values of the proposed ML model demonstrate its excellent fitting and prediction performance. This will provide a fast and portable intelligent sensing analysis technology for the detection of glucose in HS.

Bayberry-like bimetallic CoNi-MOF-74 derivatives/MXene hybrids with abundant heterointerfaces toward high-efficiency electromagnetic wave absorption

The flourishing development of electronic devices and radar detection technologies necessitates the urgent creation of high-efficiency electromagnetic wave (EMW) absorption materials with expansive absorption bandwidths. Although MXene has garnered significant interest in the domain of EMW absorption due to its tunable dielectric properties and structural designability, its high permittivity often results in poor impedance matching and a single loss mechanism, which makes it difficult to realize optimal EMW absorption capabilities. In this work, CoNi bimetallic metal–organic frameworks (MOFs) derived bayberry-like magnetic porous carbon (CoNiMPC)@carbon nanotubes (CNTs)/MXene (CNCM) hybrids were initially synthesized via simple solution precipitation, thermal treatment, and electrostatic self-assembly strategy. As anticipated, excellent EMW absorption characteristics were achieved by adjusting the ratio of CoNiMPC@CNTs and MXene. Multi-heterointerfaces consisting of zero-dimensional porous carbon, one-dimensional carbon nanotubes, and two-dimensional (2D) MXene, electrical/magnetic coupling effects, and polarization loss induced by abundant heterointerfaces endow the prepared CNCM hybrids with high-performance EMW absorption. Notably, the CNCM-7 hybrid material exhibits a minimum reflection loss (RLmin) of − 65.3 dB at 6.8 GHz with a mere 2.7 mm thickness and an effective absorption bandwidth (EAB, RL < −10 dB) of 5.0 GHz at a thickness of 1.27 mm. This study proposes a unique viewpoint and approach towards the design and preparing high-performance MXene-based EMW absorption materials.

Ni‐Co‐based bimetal organic framework as superior electrode material for hydrogen evolution reaction and supercapacitors

AbstractMetal‐organic frameworks (MOFs) possess several desirable properties, including a homogeneous crystal structure, variable porosity, high surface area, and a notable adsorption affinity, making them highly promising contenders for deployment as electrode materials in supercapacitors (SCs) and water electrolyzers, which are acknowledged for the ever‐increasing demand for instantaneous energy. Herein, we report the rationally assembled Ni‐Co‐based bimetallic MOF compounds using a glutaric acid as an organic ligand and low‐temperature hydrothermal treatment that surmounts the electrocatalytic and electrochemical charge storage activity in an alkaline medium. The NiCo‐MOF surpassed the hydrogen evolution reaction (HER) among other as‐synthesized materials, exhibiting the least overpotential of 182 mV at 10 mA/cm2 of current density, showed splendid kinetics with a turnover frequency of 2.86 s−1, and higher stability after 1000 HER cycles in 1 M KOH. Furthermore, NiCo‐MOF impetuses were employed for SC application and displayed the highest specific capacitance of 978 F/g than Ni‐MOF (706 F/g) and Co‐MOF (91 F/g) at 1 A/g of current density. Theoretical studies exhibited that the optimal electronic coupling and synergistic effect due to Ni‐Co sites enhances the overall electronic properties of NiCo‐MOF. Therefore, enhancing its electrochemical performance concerning water‐splitting and charge storage. This study showcases a novel approach for producing ultrathin and flexible bimetallic MOF‐based electrode material to enrich the performance in electrocatalytic HER and SCs.

Electrochemical Synthesis and Electrocatalytic Oxygen-Evolution Performance of Two-Dimensional NiCo-BPDC Materials.

Metal-organic frameworks (MOFs) have been widely studied as electrocatalysts, and the research strategy to improve their electrocatalytic oxygen evolution reaction (OER) performance is to modify their structure. In this paper, two-dimensional bimetallic MOFs were constructed to improve electrocatalytic OER performance. Using a mild electrochemical method with Ni and Co as metal sources and 4, 4 '-biphenyl dicarboxylic acid (H2BPDC) as ligand, two-dimensional NiCo-BPDC was synthesized and then deposited on a carbon cloth electrode. The results show that NiCo-BPDC/CC possessed a low overpotential of 356 mV at a current density of 20 mA cm-2 with a small Tafel slope of 86 mV dec-1 in 1.0 M KOH solution. The two-dimensional NiCo-BPDC exhibits excellent electrocatalytic OER performance because the coordination of Ni and Co in the material and the interaction of the two-dimensional materials provide a large electrochemically active surface area and expose more metal active sites for OER, thus improving the reaction efficiency and indicating NiCo-BPDC as potential OER electrocatalyst.

Smartphone-integrated ratiometric fluorescence sensing platform based on bimetallic metal-organic framework nanowires for anthrax biomarker detection.

Developing an intelligent, sensitive, and visual strategy for quickly identifying anthrax biomarkers is crucial for ensuring food safety and preventing disease outbreaks. Herein, a smartphone-integrated ratiometric fluorescent sensing platform based on bimetallic metal-organic framework (Eux/Tb1-x-MOF) nanowires was designed for specific recognition of pyridine-2,6-dicarboxylic acid (DPA, anthrax biomarker). The Eux/Tb1-x-MOF was prepared by coordinating Eu3+ and Tb3+ with BBDC ligands, which exhibited a uniform fibrous morphology and dual-emission fluorescence at 543 and 614nm. After the introduction of DPA, the red emission at 614nm displayed obvious fluorescence quenching, while the green emission at 543nm wasgradually enhanced. The ratiometric sensing offered a wide linear equation in the range of 0.06-15µg/mL and a low detection limit (LOD) of 20.69ng/mL. Furthermore, a portable smartphone installing the color recognition application can achieve sensitive, real-time, and visual detection of DPA. As a simple and effective smartphone-assisted sensing platform, this work holds admirable promise to broaden the applications in biomarker real-time determinations and other fields.