Nitrogen Reduction Processes Research Articles

Optimization of precursor structure by dispersants to promote nitrogen reduction process to prepare high-quality VN

In this study, three dispersants of polyvinyl pyrrolidone (PVP), polyethylene glycol (PEG) and citric acid (CA) are used to optimize the structure of the precursor in order to prepare high quality VN. Under optimum condition, the VN with nitrogen content of 17.94 % is prepared by adding 5 % PVP. The sequence of phase evolution from the precursor to VN is: APV → V2O5 → V6O13 → V7O13 → VO2 → V3O5 → V2O3 → (VC) → VN. The precursors of adding 5 % PVP have lower Ea of 0.17 kJ mol−1, 20.51 kJ mol−1 and 62.70 kJ mol−1 during reduction and nitration process, which is easier to be reduced and nitridated. PVP not only promotes the uniform dispersion of the carbon powders in the vanadium rich solution but also enhance the hydrogen bonding of APV ions to promote their nucleation and growth. The precursor with uniform and concentrated particle size distribution, complete and stable encapsulation of shell of APV and core of carbon powder, and uniform and moderate thickness of APV shell is successfully prepared by adding PVP. The precursor has a larger phase reaction interface and more reactive sites during the nitriding reduction process, which results in a faster reduction and nitriding rate. In comparison with the current process, the nitriding reaction temperature has been reduced from 1400 ∼ 1500 °C to 1150 ∼ 1200 °C, the reaction time has been shortened by 75 %, and the N2 consumption has been reduced by 40 %.

Decoupling soil community structure, functional composition, and nitrogen metabolic activity driven by salinity in coastal wetlands

Coastal wetlands, being a multifaceted and crucial global ecosystem, are facing significant impacts from diverse environmental alterations, particularly soil salinization. Concurrently, the escalation of extreme climate events, such as global warming, presents complex challenges for the protection and restoration efforts. Previous researches concerning microbial communities in the context of climate with continous line numbering change have predominantly concentrated on their structural aspects, with limited attention given to establishing relationships between community structure and functional attributes. In this study, a two-year investigation was conducted on conventional coastal wetland ecosystems, considering variations in salinity and seasonal temperature. Utilizing high-throughput 16S rRNA sequencing, isotope technology, and other methods to explore the bacterial community, nitrogen cycling functional groups, and nitrogen reduction process. This research aims to assess the holistic impacts of significant global environmental changes on microbial communities. The results suggest that salinity, acting as an environmental filter, has a significant impact on the microbial community composition. It leads to a decrease in species abundance, an increase in deterministic processes and the nesting of community succession, while also reducing the stability of microbial ecological networks. The mechanism by which soil salinity impacts bacterial communities involves three main aspects: direct effects, positive climate regulation, and negative regulation of soil properties. Surprisingly, soil salinity exerts a mild inhibitory influence on microbial functional genes and metabolic activity. The primary factors involved in the nitrogen reduction process include electron donors/acceptors, types of nitrogen sources, and organic carbon. The three processes are interconnected due to the impact of environmental factors and signal transmission among microbial populations. This study offers a novel scientific framework for the rehabilitation and enhancement of saline-alkali coastal ecosystems in the face of impending global changes. It achieves this by investigating the varied response patterns exhibited by microbial communities and ecological functional metabolism under salinity-induced stress.

Boosting electrocatalytic nitrogen fixation on Ni-P codoped MoS2 nanosheets

Electrocatalytic nitrogen fixation in an aqueous solution is considered a promising approach to ammonia synthesis. Still, this process has low Faraday efficiency and ammonia yield, so it is necessary to develop an efficient, clean, and safe catalyst to promote nitrogen reduction process. Doping can be easily carried out during the crystal growth owing to the weak interaction between the sandwiched layers (due to van der Waals forces) of MoS2. Here, a Ni-P codoped MoS2 nanosheets is designed as a highly efficient catalyst for electrochemical nitrogen fixation with superior selectivity. Especially, the doping of Ni achieved the transformation of MoS2 from 2 H phase to 1 T phase, improving the conductivity of the material. In addition, the doping of P creates more sulfur vacancies in the catalyst, thereby producing more H*, which promotes the adsorption and activation of nitrogen. The as-synthesized Ni-P codoped MoS2 nanosheets show excellent catalytic performance with a high yield of electrocatalytic ammonia synthesis (84.29 μgNH3 h−1 mgcat−1) and Faraday efficiency (2.39 %) at −0.5 V versus reversible hydrogen electrode in acidic electrolytes (0.005 M H2SO4), which outperformed most electrocatalytic ammonia synthesis catalysts. Furthermore, the Ni-P codoped MoS2 catalyst also shows outstanding electrochemical stability and durability. This work may offer a hopeful lead for designing effective non-noble-metal NRR electrocatalysts.

Phosphomolybdic acid regulated the defective metal-organic framework UiO-66 for electrochemical nitrogen reduction reaction

In recent years, electrochemical ammonia synthesis has been considered a green process with excellent application prospects. The nitrogen reduction process (NRR) needs more activation energy when NN bonds are broken, which decreases the ammonia yield rate and Faraday efficiency (FE) for ammonia synthesis. Herein, UiO-66-xHPMo electrocatalysts are effectively synthesized by regulating the defects of the metal-organic framework (UiO-66) using phosphomolybdic acid (HPMo) as a defect regulator. XRD, FT-IR, TEM, XPS, TPD, etc., characterized the catalysts. As a result, the reasons for the increase in NH3 yield rate (RNH3) are catalysts losing the ligand of terephthalic acid, exposing more Zr6 nodes as active sites, and providing numerous active sites for NN cleavage. However, introducing HPMo makes catalysts more alkaline and have lower charge transfer resistance, which are more inclined to adsorb H+ and enhance hydrogen evolution reaction (HER), reducing FEs. Thus, with a voltage of −0.3 V (vs. RHE) and a neutral electrolyte (0.1 mol L−1 Na2SO4), UiO-66–2HPMo has excellent NRR performance (RNH3: 36.61 μg h−1 mg−1, FE: 31.09%).

Unique two-electron transfer pathway of Bismuth nanocrystal for enhanced N2 electroreduction revealed by in situ infrared spectroscopy

Due to the alarming increase in anthropogenic greenhouse gas emissions, there is an urgent need to replace the fossil fuel-driven Haber-Bosch process with green ammonia production. Electrochemical nitrogen fixation has shown preliminary promise for industrially ammonia synthesis, but an in-depth mechanistic understanding of the nitrogen reduction process remains limited. Herein, a unique dinitrogen desorption mechanism for the nitrogen reduction reaction is detected on the bismuth nanocrystals, which may explain some intriguing phenomena reported in previous works, including (1) why hydrazine is still generated in some nitrogen reduction reactions that do not follow the alternating pathway, and (2) a minor change in bismuth particle size can lead to a dramatic change in NRR performance. In addition, the experimental and theoretical calculation results reveal that the dinitrogen desorption pathway involving the transfer of two electrons usually shows lower energy barriers and faster reaction kinetics, resulting in a dramatic enhancement in NRR performance.

Impact of seasonal change on dissimilatory nitrate reduction to ammonium (DNRA) triggering the retention of nitrogen in lake

Nitrogen (N) reduction processes including denitrification and dissimilatory nitrate reduction to ammonium (DNRA) are critical for the eutrophication in the lake water. However, the understanding about the dominant pathways of N cycling keep limited due to the high complexity of N cycle processes in lacustrine environment. The N fractions in sediments collected from Shijiuhu Lake were measured using high-resolution (HR)-Peeper technique and chemical extraction method in varied seasons. The abundance and microbial community compositions of functional genes involved in various N-cycling processes were also obtained using high-throughput sequencing. The results showed that NH4+ concentrations in the pore water remarkably increased from the upper layer toward the deeper layer and from winter to spring. This trend suggested that higher temperature facilitated the accumulation of NH4+ in the water. Decreased NO3− concentrations were also detected at deeper sediment layers and higher temperature, indicating the intensification of N reduction on anaerobic conditions. The NH4+-N concentrations reduced in spring along with the slight change of NO3−-N in solid sediment, indicating the desorption and release of mobile NH4+ from solid phase to the solution. Remarkably decreased absolute abundances of functional genes were found in spring with DNRA bacteria nrfA gene as dominant genus and Anaeromyxobacter as the most dominant bacterium (21.67 ± 1.03%). Higher absolute abundance (146.2-788.1 × 105 Copies/g) of nrfA gene relative to other genes was mainly responsible for the increase of bio-available NH4+ in the sediments. Generally, microbial DNRA pathway predominated the N reduction and retention processes in the lake sediment at higher temperature and water depth even experiencing the suppression of DNRA bacteria abundance. These results suggested the existence of ecological risk via N retention by the action of the DNRA bacteria in the sediment on the condition of higher temperature, further provided valuable information for N management of eutrophic lakes.

Controlling heavy metals pollution is vital for the restoration of carbon and nitrogen transformation function of mangrove ecosystems in the Greater Bay Area, China

Pollutants, especially for heavy metals (HMs), discharged from anthropogenic activities are the potential risks to newly planted mangrove forests in the restoration process. Thus, it is crucial to investigate how HMs affect the biological processes that take place in these mangrove habitats, e.g., the transformation of carbon and nitrogen. In this study, correlations between HMs pollution, carbon storage, and nitrogen biotransformation in the Great Bay Area (GBA) were examined at five typical sites with different mangrove restoration ages. The results indicated that there were distinct differences in the concentration distribution of HMs (ranges: 0.2–369.7 mg/kg) at five sample sites, with Cd (0.2–1.6 mg/kg) being the heavily polluted element in sediments. The fluctuation of SOC (16.0–25.7 mg/kg), δ13C (−27.5 to −20.2), and NO3−-N (1.2–3.3 mg/kg) was positively correlated with the content of HMs in sediments, indicating that these components in mangrove ecosystems might have similar emission source and pose a potential threat to mangrove carbon storage. Notably, sediments with high HMs concentration decelerated carbon decomposition rate of mangrove ecosystems, especially for sites with newly planted mangrove forest. Moreover, a large abundance of Euryarchaeota was found in the HO site, suggesting that HMs may promote the conversion of carbon to CH4. The inflow of contaminants also induced the significant increasing proportion of microorganisms related to nitrogen fixing, denitrification, and dissimilarity nitrogen reduction processes, resulting a decline in the stability of co-occurrence network of nitrogen transformation. Fortunately, mangrove site with the establishment of natural reserves and controlling pollutant discharge could contribute to the rapid restoration of its ecological function, e.g., nutrient cycling and co-occurrence stability, in SZ site. Therefore, future management should focus on the decrease of pollutants discharge and pay more attention to the ecological function restoration of mangrove wetlands in the GBA.

A Review of Transition Metal Nitride-Based Catalysts for Electrochemical Nitrogen Reduction to Ammonia

Electrochemical nitrogen reduction (NRR) has attracted much attention as a promising technique to produce ammonia at ambient conditions in an environmentally benign and less energy-consuming manner compared to the current Haber–Bosch process. However, even though much research on the NRR catalysts has been conducted, their low selectivity and reaction rate still hinder the practical application of the NRR process. Among various catalysts, transition metal nitride (TMN)-based catalysts are expected to be promising catalysts for NRR. This is because the NRR process can proceed via the unique Mars–Van Krevelen (MvK) mechanism with a compressed competing hydrogen evolution reaction. However, a controversial issue exists regarding the origin of ammonia produced on TMN-based catalysts. The instability of the TMN-based catalysts can lead to ammonia generation from lattice nitrogen instead of supplied N2 gas. Thus, this review summarizes the recent progress of TMN-based catalysts for NRR, encompassing the NRR mechanism, synthetic routes, characterizations, and controversial opinions. Furthermore, future perspectives on producing ammonia electrochemically using TMN-based catalysts are provided.

Advances in Semiconductor-Based Nanocomposite Photo(electro)catalysts for Nitrogen Reduction to Ammonia.

Photo(electro)catalytic nitrogen fixation technology is a promising ammonia synthesis technology using clean solar and electric energy as the driving energy. Abundant nitrogen and water as raw materials uphold the principle of green and sustainable development. However, the generally low efficiency of the nitrogen reduction reaction has seriously restricted the application and development of this technology. The paper introduces the nitrogen reduction process and discusses the main challenges and differences in the current photo(electro)catalytic nitrogen fixation systems. It focuses on promoting the adsorption and activation of N2 and the resolution and diffusion of NH3 generated. In recent years, reviews of the modification strategies of semiconductor materials in light of the typical cases of nitrogen fixation have been reported in the literature. Finally, the future development trend of this field is analyzed and prospected.

Boosting photocatalytic ammonia synthesis performance over OVs-Rich Ru/W18O49: Insights into the roles of oxygen vacancies in enhanced hydrogen spillover effect

Synergistic water activation and nitrogen reduction process is significant to the photocatalytic ammonia synthesis reaction, in which the obtainment of active hydrogen (H*) from H2O dissociation and then transfer to N2 activation site is essential. Herein, the oxygen vacancies (OVs) enhanced hydrogen spillover is used to increase the H* transfer between the H2O activation site (Ru) and the N2 activation site (OVs-rich W18O49). Results shown that the OVs-rich Ru/W18O49 achieves high activity for NH3 production with a yield of 222.75 µmol‧g−1‧h−1, which is 5.60 folds of the OVs-deficient Ru/W18O49. Control experiments, characterization, and theoretical calculation made it clear that OVs played crucial roles in enhancing the hydrogen spillover by modifying the support's Gibbs free energy for hydrogen adsorption and lowering the barrier of H* migration. Finally, the detail mechanism was explained from a new perspective. This strategy may provide new insights for other hydrogenation reactions under mild conditions.

Nitrogen-metabolising microorganism analysis in rapid sand filters from drinking water treatment plant.

Sand filters (SFs) are common treatment processes for nitrogen pollutant removal in drinking water treatment plants (DWTPs). However, the mechanisms on the nitrogen-cycling role of SFs are still unclear. In this study, 16S rRNA gene amplicon sequencing was used to characterise the diversity and composition of the bacterial community in SFs from DWTPs. Additionally, metagenomics approach was used to determine the functional microorganisms involved in nitrogen cycle in SFs. Our results showed that Pseudomonadota, Acidobacteria, Nitrospirae and Chloroflexi dominated in SFs. Subsequently, 85 high-quality metagenome-assembled genomes (MAGs) were retrieved from metagenome datasets of selected SFs involving nitrification, assimilatory nitrogen reduction, denitrification and anaerobic ammonia oxidation (anammox) processes. Read mapping to reference genomes of Nitrospira and the phylogenetic tree of the ammonia monooxygenase subunit A gene, amoA, suggested that Nitrospira is abundantly found in SFs. Furthermore, according to their genetic content, a nitrogen metabolic model in SFs was proposed using representative MAGs and pure culture isolate. Quantitative real-time polymerase chain reaction (qPCR) showed that ammonia-oxidising bacteria (AOB) and archaea (AOA), and complete ammonia oxidisers (comammox) were ubiquitous in the SFs, with the abundance of comammox being higher than that of AOA and AOB. Moreover, we identified a bacterial strain with a high NO3-N removal rate as Pseudomonas sp. DW-5, which could be applied in the bioremediation of micro-polluted drinking water sources. Our study provides insights into functional nitrogen-metabolising microbes in SFs of DWTPs.

Nickel Nanoflowers with Controllable Cation Vacancy for Enhanced Electrochemical Nitrogen Reduction.

The key to the design of electrochemical nitrogen reduction (NRR) catalysts is that the reaction sites can not only activate the N≡N bond but also have high catalytic selectivity. Vacancy engineering is an effective way to modulate active sites, and cation vacancies are considered to have enormous potential in tuning catalytic selectivity. However, research on NRR activity is still at an early stage due to the difficulty in preparation and precise regulation. Here, we provided an adjusted method of cation vacancy through topotactic transformation, which combines solvothermal reduction with etching via lattice confinement effect to accomplish precursor reduction and vacancy construction while maintaining consistent material morphologies. Based on the topotactic transformation, NiAl-LDH precursor was reduced to Ni metal nanoflower, while Al is simultaneously etched by alkali, thus the precise tunability of the cation vacancy can be achieved by adjusting the Al content in the LDH. The Ni nanoflower achieved excellent stability and high ammonia yield by adjusting the vacancy concentration. In addition, the insight into the selectivity and intrinsic activity of cation vacancies on NRR process has been revealed. For the reaction selectivity, the cation vacancy is beneficial to activate N≡N but not conducive to the HER process. For the intrinsic NRR activity, the generation of cation vacancies can also significantly reduce the energy barrier of NRR process and accelerate the reaction kinetics.

A Bioinspired Iron‐Molybdenum μ‐Nitrido Complex and Its Reactivity toward Ammonia Formation

AbstractMultimetallic nitride species, especially those containing biologically related iron or molybdenum, are fundamentally important to understand the nitrogen reduction process catalysed by FeMo‐nitrogenase. However, until now, there remains no report about the construction of structurally well‐defined FeMo heteronuclear nitrido complex and its reactivity toward ammonia formation. Herein, a novel thiolate‐bridged FeIIMoVI complex featuring a bent Fe−N≡Mo fragment is synthesized and structurally characterized, which can be easily protonated to form a μ‐imido complex. Subsequently, through the proton‐coupled electron transfer (PCET) process, this imido species can smoothly convert into the μ‐amido complex, which can further undergo reductive protonation to afford the FeMo complex containing an ammine ligand. Overall, we present the first well‐defined {Fe(μ‐S)2Mo} platform that can give a panoramic picture for the late stage (N3−→NH2−→NH2−→NH3) of biological nitrogen reduction by the heterometallic cooperativity.

A Bioinspired Iron-Molybdenum μ-Nitrido Complex and Its Reactivity toward Ammonia Formation.

Multimetallic nitride species, especially those containing biologically related iron or molybdenum, are fundamentally important to understand the nitrogen reduction process catalysed by FeMo-nitrogenase. However, until now, there remains no report about the construction of structurally well-defined FeMo heteronuclear nitrido complex and its reactivity toward ammonia formation. Herein, a novel thiolate-bridged FeII MoVI complex featuring a bent Fe-N≡Mo fragment is synthesized and structurally characterized, which can be easily protonated to form a μ-imido complex. Subsequently, through the proton-coupled electron transfer (PCET) process, this imido species can smoothly convert into the μ-amido complex, which can further undergo reductive protonation to afford the FeMo complex containing an ammine ligand. Overall, we present the first well-defined {Fe(μ-S)2 Mo} platform that can give a panoramic picture for the late stage (N3- →NH2- →NH2- →NH3 ) of biological nitrogen reduction by the heterometallic cooperativity.

Weak Hypoxia Enhanced Denitrification in a Dissimilatory Nitrate Reduction to Ammonium (DNRA)-Dominated Shallow and Eutrophic Coastal Waterbody, Jinhae Bay, South Korea

The effects of seasonal hypoxia on sediment-water interface nitrogen (N) transformations in Jinhae Bay were examined from 2015 to 2019. The rates of benthic denitrification, anaerobic ammonium oxidation (anammox), dissimilatory nitrate reduction to ammonium (DNRA), nutrient exchange, and sediment oxygen consumption were measured seasonally. The oxygen (O2) and hydrogen sulfide (H2S) depth profiles were measured using microelectrodes. Neither penetration nor consumption of oxygen decreased during hypoxia. Denitrification, anammox, and DNRA ranged from 0 to 0.73, 0.13, and 1.09 mmol N m-2 day-1, respectively. Denitrification, the dominant N removal pathway, increased by 75% while anammox ceased, which led to an overall increase of 55% in the total N2 gas production during hypoxia relative to that during normoxia. Enhanced denitrification is the result of increased coupled nitrification–denitrification due to the intermittent supply of oxygen during bottom water hypoxia (“weak hypoxia”). In the hypoxic period, DNRA decreased by 62%, and the relative contribution of DNRA to the total nitrogen reduction process decreased from 81 to 58%, but it still outperformed denitrification as the main nitrate reduction pathway. Sediments were strong sources of ammonium for the water column, both under normoxia and hypoxia, whereas they were a sink of nitrate from the water column during hypoxia. Bioturbation may be important for maintaining oxygen penetration and consumption in sediments. The dominance of DNRA was mainly due to the relatively high content of sulfide and organic-rich sediments. The repressed macrofaunal activity and increased coupling of nitrification and denitrification during hypoxia may have contributed to enhanced denitrification. Taken together, the overall dominance of DNRA might contribute to the development and maintenance of eutrophication and seasonal hypoxia in this system. However, in contrast to the previous results, denitrification was enhanced during “weak hypoxia,” which might be helpful in alleviating eutrophication.

Activation of Fe species on graphitic carbon nitride nanotubes for efficient photocatalytic ammonia synthesis

Photocatalytic ammonia synthesis, as a suitable alternative to traditional Haber-Bosch artificial nitrogen reduction process, has aroused widespread interest. Graphitic carbon nitride (g-C3N4) has emerged as an attractive metal-free photocatalyst, but its development in photocatalytic ammonia synthesis field is greatly shackled to the low photocatalytic activity. In this work, a highly active Fe-doped tubular graphitic carbon nitride (Fe-TCN) is reported, which demonstrates transformative performance on photosynthesis of NH3 from N2. Such excellent photocatalytic activity is derived from the incorporation of Fe species as the active sites to efficiently adsorb and activate N2 molecules on the surface of TCN. Simultaneously, surface-active Fe species are also regarded as the trap sites of electrons, and the concentrated electrons at surface-active Fe species can significantly improve the NH3 conversion efficiency. Impressively, Fe-TCN realized a 9.5-fold enhancement of NH3 production rate with the yield of 647 μmol g−1 h−1 (λ ≥ 420 nm), and the corresponding reaction pathways are also established.

Quantitative Operando Detection of Electro Synthesized Ammonia Using Mass Spectrometry

AbstractIn this work the successful operando detection of synthesized ammonia from nitrogen reduction in non‐aqueous electrolytes with an electron‐ionization mass spectrometer was reported. Using selective ionization at 22 eV together with a highly sensitive micro‐chip‐based electrochemistry mass spectrometry set‐up, quantitative detection of produced ammonia down to few pmol s−1 in non‐aqueous as well as aqueous electrolytes was demonstrated. The well‐defined electrochemical and mass transport environment of the thin‐layer electrochemical cell allowed for fundamental studies of the nitrogen reduction process, which was shown to produce ammonia at faradaic efficiencies of 49±3 % at ambient pressure. Moreover, through the operando capabilities of the developed method, it was shown that ammonia production proceeded even after lithium electroplating had been terminated This potentially explained why higher faradaic efficiencies of lithium mediated ammonia synthesis were observed under dynamic cycling conditions. Two possible mechanisms for this behavior were proposed and an outlook towards future research in operando studies of lithium mediated ammonia synthesis was given.

Facile Synthesis and High‐Value Utilization of Ammonia

Comprehensive SummaryAmmonia is a key component in fertilizer and the carbon‐free hydrogen carrier. Catalytic ammonia synthesis and utilization have played a central role in the development of chemical engineering. The industrial production of ammonia remains dependent on the energy‐ and carbon‐intensive Haber–Bosch process. A major effort has been devoted to developing robust and efficient catalysts, as well as alternative benign processes. Herein, we detail our endeavors that develop the ammonia synthesis and decomposition catalysts, and utilize the ammonia energy. We firstly discuss the catalysts for ammonia synthesis via dissociative and associative process, and the regulation of catalysts’ properties. Then, we review the burgeoning electrocatalytic nitrogen reduction process, focusing on the enhanced catalytic performances by the regulation of the catalysts and the electrode. Additionally, we provide a novel high‐value utilization of ammonia to achieve the “zero‐carbon” circular economy. The promising catalysts, reactors, and ammonia energy systems have been discussed in detail. We end this Account that offers future research directions and prospects of ammonia. What is the most favorite and original chemistry developed in your research group?Ammonia synthesis catalysts and ammonia energy.How do you get into this specific field? Could you please share some experiences with our readers?I have received my B.S. in 1997. After graduation from college, I have joined Prof. Kemei Wei's group at the National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University. Since 1972, our group has dedicated to the efficient industrial synthesis and high‐value utilization of ammonia. So, I have done much work in this field. I think that the research work should match with the major national demands and global challenges. The researcher should focus on cutting‐edge discoveries and creative work.How do you supervise your students?When the students come in our group, I teach them the norms andstandards of academic research and writing. After that, I would formulate the research project based on their motivations, aspirations, and academic background. If they have any problems during the project, I will help them overcome. We discuss termly on their research methods and evaluate their research results. I also encourage the students to prepare in advance for the next steps in their career or further study.What is the most important personality for scientific research?Research integrity.What are your hobbies? What's your favorite book(s)?I like playing badminton and table tennis. My favorite books are history and industry development plan.How do you keep the balance between research and family?The understanding and support from the family are very important. I have increased my efficiency and productivity, and tried alternative schedules.

Atomically Dispersed Manganese Lewis Acid Sites Catalyze Electrohydrogenation of Nitrogen to Ammonia

Atomically Dispersed Manganese Lewis Acid Sites Catalyze Electrohydrogenation of Nitrogen to Ammonia

Single-Atom High-Valent Fe(IV) for Promoted Photocatalytic Nitrogen Hydrogenation on Porous TiO2-SiO2

Synergistic nitrogen reduction and water oxidation process is significant to the photocatalytic fixation of nitrogen. However, the coupling mechanism remains ambiguous and lacks study. Herein, we r...