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

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 360, P. 124528 - 124528

Published: Aug. 24, 2024

Language: Английский

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

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 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.

Language: 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, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 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.

Language: Английский

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

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(16), P. 7228 - 7236

Published: March 29, 2024

The development of electrocatalysts that can efficiently reduce nitrate (NO

Language: 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, Journal Year: 2024, Volume and Issue: 146(36), P. 24966 - 24977

Published: Aug. 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.

Language: Английский

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

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110708 - 110708

Published: Jan. 1, 2025

Language: 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, Journal Year: 2024, Volume and Issue: 354, P. 124150 - 124150

Published: May 4, 2024

Language: Английский

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

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 495, P. 153108 - 153108

Published: June 13, 2024

Language: Английский

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

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 492, P. 138266 - 138266

Published: April 15, 2025

Language: 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, Journal Year: 2024, Volume and Issue: 357, P. 124286 - 124286

Published: June 12, 2024

Language: Английский

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