Essential features of weak current for excellent enhancement of NOx reduction over monoatomic V-based catalyst

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 6, 2024

Human society is facing increasingly serious problems of environmental pollution and energy shortage, up to now, achieving high NH3-SCR activity at ultra-low temperatures (<150 °C) remains challenging for the V-based catalysts with V content below 2%. In this study, monoatomic catalyst under weak current-assisted strategy can completely convert NOx into N2 temperature 1.36%, which shows preeminent turnover frequencies (TOF145 °C = 1.97×10−3 s−1). The improvement catalytic performance mainly attributed enhancement catalysis current (ECWC) rather than electric field, significantly reduce consumption system by more 90%. further mechanism research ECWC based on a series characterization means DFT calculations confirms that migrated electrons concentrate around single atoms increase proportion antibonding orbitals, make V-O chemical bond weaker (electron scissors effect) thus accelerate oxygen circulation. novel in present work potentially apply other fields. Achieving NH3 selective reduction (below 150 challenge catalysts. Here authors explore electron effect catalysis, enables exhibit exceptional denitration temperatures.

Language: Английский

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An overview of silicon-air batteries: Principle, current state and future perspectives

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 517, P. 216045 - 216045

Published: July 1, 2024

Language: Английский

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Unlocking the potential of hydrogen evolution: Advancements in 3D nanostructured electrocatalysts supported on nickel foam

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 355, P. 124197 - 124197

Published: May 12, 2024

Language: Английский

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Insights into Operating Conditions on Electrocatalytic CO₂ Reduction

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

Published: Feb. 5, 2025

Abstract Electrocatalytic CO 2 reduction (CO RR) is rapidly emerging as a promising sustainable strategy for transforming into valuable fuels and chemical feedstocks, crucial step toward carbon‐neutral society. The efficiency, selectivity, stability of RR are heavily influenced by the chosen catalyst operating conditions used. Despite substantial advances in development catalysts, there scarcity comprehensive reviews focusing on influence different environments performance. This review offers detailed examination internal external environmental control strategies designed to enhance efficiency. fundamental reaction mechanisms through situ operational techniques, paired with theoretical analyses, discussed while also identifying key challenges future research directions technology. By delivering overview current state field, this highlights critical role control, mechanistic insights, practical considerations needed successful commercialization

Language: Английский

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Vacancy defect activation spin magnetic effect of Ni(OH)2 enhanced oxygen catalysis

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 72, P. 201 - 208

Published: May 29, 2024

Language: Английский

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Reconstruction of Ferromagnetic/non‐magnetic Cobalt‐based Electrocatalysts under Gradient Magnetic Fields for Enhanced Oxygen Evolution

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(46)

Published: Aug. 6, 2024

Abstract The rational manipulation of the surface reconstruction catalysts is a key factor in achieving highly efficient water oxidation, but it challenge due to complex reaction conditions. Herein, we introduce novel situ strategy under gradient magnetic field form catalytically active species on ferromagnetic/paramagnetic CoFe 2 O 4 @CoBDC core–shell structure for electrochemical oxygen evolution (OER). We demonstrate that Kelvin force from cores’ local modulates shells’ reconstruction, leading higher proportion Co 2+ as sites. These sites with optimized electronic configuration exhibit more favorable adsorption energy oxygen‐containing intermediates and lower activation overall catalytic reaction. As result, significant enhancement OER performance achieved large current density increment about 128 % at 1.63 V an overpotential reduction by 28 mV 10 mA cm −2 after reconstruction. Interestingly, removing external field, activity could persist over 100 h. This work showcases directional enhanced oxidation.

Language: Английский

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Modulation of Electrochemical Reactions through External Stimuli: Applications in Oxygen Evolution Reaction and Beyond

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Electrochemical water splitting is a promising method for generating green hydrogen gas, offering sustainable approach to addressing global energy challenges. However, the sluggish kinetics of anodic oxygen evolution reaction (OER) poses great obstacle its practical application. Recently, increasing attention has been focused on introducing various external stimuli modify OER process. Despite significant enhancement in catalytic performance, an in-depth understanding origin superior activity contributed by remains elusive, which significantly hinders further development highly efficient and durable electrolyzed devices. Herein, this review systematically summarizes recent advancements stimuli, including photon irradiation, applied magnetic field, thermal heating, etc., boost activities. In particular, underlying mechanisms promote species transfer, electronic structure electrocatalysts, accelerate structural reconstruction are highlighted. Additionally, applications other electrocatalytic reactions also presented. Finally, several remaining challenges future opportunities discussed, providing insights that could study support rational design storage conversion

Language: Английский

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Static magnetic field-enhanced cathodic electrocatalysis of Fe3O4-based nitrogen-doped carbon for improving the performance of microbial fuel cells

Bioresource Technology, Journal Year: 2025, Volume and Issue: 426, P. 132345 - 132345

Published: March 4, 2025

Language: Английский

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Experimental evidences of the direct influence of external magnetic fields on the mechanism of the electrocatalytic oxygen evolution reaction

APL Energy, Journal Year: 2024, Volume and Issue: 2(1)

Published: Feb. 12, 2024

The use of magnetic fields as external stimuli to improve the kinetics electrochemical reactions is attracting substantial attention, given their potential reduce energy losses. Despite recent reports showing a positive effect on catalytic performance upon applying field working electrode, there are still many uncertainties and lack experimental evidence correlating presence electrocatalytic performance. Here, we present combination spectroscopic tools that demonstrate how an alters reaction mechanism oxygen evolution (OER), accelerating overall Ni4FeOx electrode. Complementary has been gathered supporting participation this microscopic effect. Electrochemical impedance spectroscopy (EIS) points speed-up intrinsic kinetics, independent other indirect effects. In same direction, spectro-electrochemical fingerprint intermediate species appear during cycle, detected under operando conditions, indicates change in order function hole accumulation. All these data confirm direct influence at origin magnetically enhanced OER.

Language: Английский

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Strain engineering induced surfacial catalytic amorphous Ni3C with room temperature ferromagnetism for magnetic heating enhancement of overall water-splitting

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 486, P. 150174 - 150174

Published: March 4, 2024

Language: Английский

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