Coupling Adsorbed Evolution and Lattice Oxygen Mechanism in Fe‐Co(OH)₂/Fe₂O₃ Heterostructure for Enhanced Electrochemical Water Oxidation

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(45)

Published: Sept. 1, 2023

Abstract Oxygen evolution reaction (OER) remains a bottleneck for electrocatalytic water‐splitting to generate hydrogen. However, the traditional adsorbed mechanism (AEM) possesses sluggish kinetics due scaling relationship, while lattice oxygen (LOM) triggers an unstable structure escaping of oxygen. Herein, proof‐of‐concept Fe‐Co(OH) 2 /Fe O 3 heterostructure is put forward, where following AEM can complete rapidly deprotonation process Fe LOM trigger O─O coupling step. Combining theoretical and experimental investigation confirmed that redistributed space‐charge junction optimize synergistically oxygen, facilitate synchronously OER activity stability. As result, shows excellent performance with low overpotential only 219 249 mV reach current density 10 100 mA cm −2 . Specifically, electrocatalyst maintains long‐term stability h at large This work paves avenue break through limit conventional mechanism.

Language: Английский

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Recent progress of electrocatalysts for oxygen reduction in fuel cells

Journal of Colloid and Interface Science, Journal Year: 2021, Volume and Issue: 607, P. 791 - 815

Published: Sept. 6, 2021

Language: Английский

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Engineering electron redistribution of bimetallic phosphates with CeO2 enables high-performance overall water splitting

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 453, P. 139796 - 139796

Published: Oct. 15, 2022

Language: Английский

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Swapping Catalytic Active Sites from Cationic Ni to Anionic S in Nickel Sulfide Enables More Efficient Alkaline Hydrogen Generation

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(8)

Published: Jan. 9, 2022

Abstract Tuning active sites in catalyst design is the key to boosting intrinsic activity of hydrogen evolution reaction (HER). Cationic Ni has been widely established as an site nickel sulfide due relatively low Gibbs free energy adsorption ( Δ G H* ). However, one big unsettled issues whether S can be activated a more than NiS 2 . Herein, swapping catalytic from cationic anionic hierarchical structure consisting nanoflowers grown on dual‐phased ‐NiS foam (denoted /NiS ‐NiS) shown. A combined study theoretical calculations and X‐ray photoelectron spectroscopy analysis demonstrate remarkably antidromic electron transfer sites, therefore relieving species endowing higher at over site. The new exhibits superior HER performance, identified by doubling twofold increased turnover frequency value compared its pure counterpart (0.028 s −1 vs 0.015 applied overpotential 200 mV). electrode also demonstrates outstanding toward oxygen overall water splitting.

Language: Английский

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Surface reconstruction-derived heterostructures for electrochemical water splitting

EnergyChem, Journal Year: 2022, Volume and Issue: 5(2), P. 100091 - 100091

Published: Sept. 6, 2022

Language: Английский

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