Tandem Active Sites in Cu/Mo‐WO₃ Electrocatalysts for Efficient Electrocatalytic Nitrate Reduction to Ammonia

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 5, 2025

Abstract Electrocatalytic NO 3 − reduction to NH is a promising technique for both ammonia synthesis and nitrate wastewater treatment. However, this conversion involves tandem processes of H 2 O dissociation hydrogenation, leading inferior Faraday efficiency (FE) yield rate. Herein, catalyst by anchoring atomically dispersed Cu species on Mo‐doped WO (Cu 5 /Mo 0.6 ‐WO ) the RR constructed, which achieves superior FE N 98.6% rate 26.25 mg h −1 cat at −0.7 V (vs RHE) in alkaline media, greatly exceeding performance Mo /WO counterparts. Systematic electrochemical measurement results reveal that promoted activation sites, accompanying accelerated water producing active hydrogens are responsible performance. In situ infrared spectroscopy theoretical calculation further demonstrate sites accelerate , dopant activates adjacent resulting decreased energy barrier * stepwise hydrogenation processes, making thermodynamically favorable. This work demonstrates critical role atomic level enhancing electrocatalytic paving feasible avenue developing high‐performance electrocatalysts.

Язык: Английский

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Purification and Value-Added Conversion of NO_x under Ambient Conditions with Photo-/Electrocatalysis Technology

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 6, 2025

As primary air pollutants from fossil fuel combustion, the excess emission of nitric oxides (NOx) results in a series atmospheric environmental issues. Although selective catalytic reduction technology has been confirmed to be effective for NOx removal, green purification and value-added conversion under ambient conditions are still facing great challenges, especially nitrogen resource recovery. To address that, photo-/electrocatalysis offers sustainable routes efficient upcycling temperature pressure, which received considerable attention scientific communities. In this review, recent advances critically summarized. The target products reaction mechanisms systems, together with responsible active sites, discussed, respectively. Then, realistic practicability is proposed, including strict performance evaluation criteria application by photo-/electrocatalysis. Finally, current challenges future opportunities proposed terms catalyst design, enhancement, mechanism understanding, practical conditions, product separation techniques.

Язык: Английский

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Theoretical Insights into the Selectivity of Single-Atom Fe–N–C Catalysts for Electrochemical NO_x Reduction

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Фев. 2, 2025

Single-atom Fe-N-C catalysts have attracted significant attention in the NOx reduction reaction (NOxRR). However, origin of their selectivity NOxRR remains unclear, impeding further advancements application. Herein, we investigate potential-driven competitive mechanism for NH3 and NH2OH production over single-atom pyridinic-FeN4 pyrrolic-FeN4 sites using constant-potential density functional theory calculations. The is linked to switching Fe 3d orbitals as they interact with intermediates. between determined by applied potentials. predominantly generates at higher potentials (-0.6 -1.2 V, vs SHE), while favored lower (0.6 -0.6 V). shows a similar potential-dependent product distribution, crossover potential -1.0 V. selectivity-determining intermediates (SDIs) are *NH2OH *NH2 + *OH. governed interacting SDIs, from dumbbell-shaped 3dz2 four-leaf clover-like 3dxz, 3dyz, 3dx2-y2, which plays crucial role controlling distribution based on These findings offer new insights into NOxRR.

Язык: Английский

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Dichalcogenides as Emerging Electrocatalysts for Efficient Ammonia Synthesis: A Focus on Mechanisms and Theoretical Potentials

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 28, 2025

Abstract Developing sustainable technologies for ammonia production through electrochemical reactions offers a promising alternative by leveraging renewable energy sources to produce under ambient conditions. These methods include nitrogen reduction reaction (NRR), nitric oxide (NORR), nitrite (NO 2 RR), and nitrate 3 RR). Optimizing efficiency (EE) in synthesis has become increasingly crucial as commercialization approaches. Herein, this work comprehensive study of system EE improvements the theoretical voltage calculations based on pH expansion bifunctional catalysts like transition metal dichalcogenides (TMDs), which can efficiently catalyze oxygen evolution (OER) synthesis. The review summarizes pH‐dependent redox potential Pourbaix diagrams NRR, NO RR, offering insights into potential‐pH regions where oxides are reduced NH . Incorporating design enables researchers minimize losses better improve overall performance. Finally, wraps up exploring roles TMD different mechanisms identifying areas improvement. broader impact lies its transform alignment with global efforts reduce greenhouse gas emissions.

Язык: Английский

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Advances in electrocatalytic nitrate reduction to ammonia over Cu-based catalysts

Environmental Research, Год журнала: 2025, Номер unknown, С. 121123 - 121123

Опубликована: Фев. 1, 2025

Язык: Английский

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Persulfate-Based Advanced Oxidation Reforming of Polyethylene Terephthalate Fiber into Formate via Singlet Oxygen Activation

Advanced Fiber Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 10, 2025

Язык: Английский

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2D Catalysts for Electrocatalytic Nitrate Reduction and C–N Coupling Reactions

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 16, 2025

Abstract Powering the electrochemical nitrate reduction reaction (NO 3 ⁻RR) by renewable energy is a sustainable way to restore environment and produce nitrogen–hydrogen compounds. However, process requires multiple electron transfers complex paths, making it essential understand mechanisms at molecular level. In this regard, 2D materials attract significant interest due their large surface area, tunable electronic structures, suitability as model catalysts for studying structure–activity relationships. Advances in use of electrocatalytic NO ⁻RR C–N coupling reactions are analyzed elucidated influence various catalyst design strategies on mechanisms. Using advanced situ/operando measurement techniques, conducting rigorous theoretical analyses, scaling up industrial electrolyzers pivotal unlocking practical potential beyond. A map developing next‐generation electrocatalysts devices provided enable efficient nitrogen cycle using electrocatalysis.

Язык: Английский

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Palladium Married with MBene Multilayers: Enabling Intensified Hydrogen Spillover for Efficient Nitrite‐to‐Ammonia Electroreduction

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 8, 2025

Abstract Electrochemical nitrite reduction reaction (NO 2 RR) has emerged as a promising alternative approach for ammonia (NH 3 ) production, offering both energy efficiency and environmental sustainability. The rational regulation of active hydrogen (*H) is pivotal NO − ‐to‐NH conversion, yet it remains significant challenge in the context RR. In this study, molybdenum boride (MBene) multilayers are introduced an electronic support to integrate with palladium (Pd) nanoparticles, creating dual catalytic sites that effectively balance adsorption *H *NO , thereby enabling synergistic catalysis Theoretical experimental analyses revealed efficiently generated on Pd subsequently undergoes spillover ‐adsorbed MBene surfaces, facilitating accelerated hydrogenation NH synthesis. Consequently, Pd/MBene catalyst demonstrated exceptional performance, achieving high Faradaic 89%, yield rate 16.9 mg h −1 cat remarkable cycling stability at low applied potential ‐0.3 V versus RHE. Motivated by outstanding RR further utilized cathode construct Zn‐nitrite formaldehyde‐nitrite batteries. These systems functionality simultaneous production electricity generation, highlighting versatile efficient sustainable conversion.

Язык: Английский

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Efficient nitrate electroreduction to ammonia over Copper catalysts supported on Electron-Delocalized covalent organic frameworks

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 156343 - 156343

Опубликована: Окт. 1, 2024

Язык: Английский

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Advanced Ruthenium‐Based Electrocatalysts for NO_x Reduction to Ammonia

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 15, 2024

Ammonia (NH

Язык: Английский

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