Promoting active hydrogen supply for kinetically matched tandem electrocatalytic nitrate reduction to ammonia

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 360, С. 124528 - 124528

Опубликована: Авг. 24, 2024

Язык: Английский

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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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Cd Single Atom as an Electron Mediator in an S‐Scheme Heterojunction for Artificial Photosynthesis of H₂O₂

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 13, 2025

Abstract Developing conductor‐mediated S‐scheme heterojunction photocatalysts imitating natural photosynthetic systems emerges as a promising approach to hydrogen peroxide (H 2 O ) production. However, achieving precise coupling between two semiconductors with charge shuttle and modulating the interfacial interactions still remain significant bottleneck. Herein, we propose catalyst architecture Cd single atom mediated formed by interfacing CdS TiO nanoparticles. This exhibits an H production rate high 60.33 µmol g −1 min under UV–vis light irradiation, which is attributed efficient transport at interface of thanks S‐scheme. In‐situ X‐ray photoelectron spectroscopy (XPS) electron spin resonance (ESR) spin‐trapping tests confirm transfer route. Femtosecond transient absorption (fs‐TA) other ex‐situ characterizations further corroborate across interface. work offers new perspective on constructing atoms heterojunctions enhance photocatalytic performance.

Язык: Английский

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Co-Cu dual active sites for synergistic electrochemical nitrate reduction to ammonia

Journal of Hazardous Materials, Год журнала: 2025, Номер 492, С. 138266 - 138266

Опубликована: Апрель 15, 2025

Язык: Английский

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Spatially Separated Cu/Ru on Ordered Mesoporous Carbon for Superior Ammonia Electrosynthesis from Nitrate over a Wide Potential Window

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(36), С. 24966 - 24977

Опубликована: Авг. 28, 2024

Nitrate (NO3–) in wastewater poses a serious threat to human health and the ecological environment. The electrocatalytic NO3– reduction ammonia (NH3) reaction (NO3–RR) emerges as promising carbon-free energy route for enabling removal sustainable NH3 synthesis. However, it remains challenge achieve high Faraday efficiencies at wide potential window due complex multiple-electron process. Herein, spatially separated dual-metal tandem electrocatalysts made of nitrogen-doped ordered mesoporous carbon support with ultrasmall high-content Cu nanoparticles encapsulated inside large low-content Ru dispersed on external surface (denoted Ru/Cu@NOMC) are designed. In NO3–RR, sites can quickly convert adsorbed NO2– (*NO2–), while efficiently produce active hydrogen (*H) enhance kinetics converting *NO2– sites. Due synergistic effect between sites, Ru/Cu@NOMC exhibits maximum Faradaic efficiency (FENH3) approximately 100% −0.1 V vs reversible electrode (RHE) yield rate 1267 mmol gcat–1 h–1 −0.5 RHE. Finite element method (FEM) simulation electrochemical situ Raman spectroscopy revealed that framework intermediate concentration confinement effect. Thanks Cu–Ru mesopore effect, 500 mV FENH3 over 90% superior stability production 156 h be achieved catalyst.

Язык: Английский

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Selective Nitrate Electroreduction to Ammonia on CNT Electrodes with Controllable Interfacial Wettability

Environmental Science & Technology, Год журнала: 2024, Номер 58(16), С. 7228 - 7236

Опубликована: Март 29, 2024

The development of electrocatalysts that can efficiently reduce nitrate (NO

Язык: Английский

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Mechanism of Key Intermediates Regulation in Electrocatalytic Nitrate-to-Ammonia Conversion Driven by Polarized Electric Field

Nano Energy, Год журнала: 2025, Номер unknown, С. 110708 - 110708

Опубликована: Янв. 1, 2025

Язык: Английский

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Engineering low-valent molybdenum sites in CoMoO4 nanosheets to boost electrochemical nitrogen-rich wastewater treatment

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 354, С. 124150 - 124150

Опубликована: Май 4, 2024

Язык: Английский

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Electrochemical reduction of nitrate to Ammonia: Recent progress and future directions

Chemical Engineering Journal, Год журнала: 2024, Номер 495, С. 153108 - 153108

Опубликована: Июнь 13, 2024

Язык: Английский

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Pinning-effect single-atom NiCo alloy embedded graphene-aerogel in electro-fenton process for rapid degradation of emerging contaminants

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 357, С. 124286 - 124286

Опубликована: Июнь 12, 2024

Язык: Английский

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