Directional Reconstruction of Iron Oxides to Active Sites for Superior Water Oxidation

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(43)

Published: June 27, 2023

Abstract Rationally constructing and manipulating the in situ formed catalytically active surface of catalysts remains a tremendous challenge for highly efficient water electrolysis. Herein, an anion cation co‐induced strategy is presented to modulate catalyst dissolution‐redeposition achieve directional reconstruction Zn S co‐doped Fe 2 O 3 4 on iron foams (Zn,S‐Fe ‐Fe /IF), oxygen evolution reaction (OER). Benefiting from Zn, co‐doping presence , directionally reconstructed obtained. The Zn,S‐Fe /IF into FeOOH ‐FeOOH/IF), which leaching promotes dissolution co‐deposition regulates activity obtained FeOOH. Moreover, provides stable site deposition, thus causes more components be formed. Directionally ‐FeOOH/IF outperformes many state‐of‐the‐art OER demonstrates remarkable stability. experimental density functional theory (DFT) calculation results show that introduction Zn‐doped with abundant vacancies through has activated lattice atoms, facilitating process heterojunction following mechanism (LOM) pathway. This work makes stride modulating reconstruction.

Language: Английский

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Atomic-level polarization in electric fields of defects for electrocatalysis

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Nov. 29, 2023

The thriving field of atomic defect engineering towards advanced electrocatalysis relies on the critical role electric polarization at scale. While this is proposed theoretically, spatial configuration, orientation, and correlation with specific catalytic properties materials are yet to be understood. Here, by targeting monolayer MoS2 rich in defects, we pioneer direct visualization such defects combining electron microscopy differential phase contrast technology. It revealed that asymmetric charge distribution caused facilitates adsorption H*, which originally activates sites for hydrogen evolution reaction (HER). Then, it has been experimentally proven atomic-level fields can enhance HER activity. This work bridges long-existing gap between directly revealing angstrom-scale correlating as-tuned materials; methodology here could also inspire future studies focusing mechanism understanding structure-property-performance relationship.

Language: Английский

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Recent Progress of Non‐Noble Metallic Heterostructures for the Electrocatalytic Hydrogen Evolution

Small Science, Journal Year: 2023, Volume and Issue: 3(9)

Published: Aug. 2, 2023

Developing energy production, storage, and conversion technologies based on sustainable or renewable is essential to address the environmental crisis. Electrochemical water splitting one of most promising approaches realize production green hydrogen. The design catalytic materials with low cost, high activity, long‐term stability exploration specific reaction mechanisms are key focus for involved electrochemical hydrogen evolution (HER). Recently, substantial efforts have been devoted rational synthesis non‐noble metallic heterostructures fascinating synergistic effects among different components. These heterostructured demonstrate comprehensive properties exceeding estimations by rule mixtures display activity in industrial conditions HER. Herein, mechanism parameters improving performance HER process discussed detail. latest advances synthetic methods electrocatalytic characteristics from experimental computational perspectives summarized according role various insights provided this review into an in‐depth understanding as electrocatalysts, opportunities challenges scale up future‐oriented developments highlighted.

Language: Английский

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Unraveling and leveraging in situ surface amorphization for enhanced hydrogen evolution reaction in alkaline media

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 13, 2023

Surface amorphization provides electrocatalysts with more active sites and flexibility. However, there is still a lack of experimental observations mechanistic explanations for the in situ process its crucial role. Herein, we propose concept that by reconstructed amorphous surface, metal phosphorus trichalcogenides could intrinsically offer better catalytic performance alkaline hydrogen production. Trace Ru (0.81 wt.%) doped into NiPS3 nanosheets Using electrochemical transmission electron microscopy technique, confirmed occurred on edges critical achieving superior activity. Comprehensive characterizations theoretical calculations reveal primarily stabilized at through formed layer containing bridging S22- species, which can effectively reduce reaction energy barrier. This work emphasizes role suggests potential optimizing activities electrocatalysts.

Language: Английский

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Unlocking power of neighboring vacancies in boosting hydrogen evolution reactions on two-dimensional NiPS3 monolayer

eScience, Journal Year: 2023, Volume and Issue: 4(3), P. 100204 - 100204

Published: Oct. 16, 2023

This study investigates the effect of defect engineering on catalytic activity a NiPS3 monolayer catalyst for hydrogen evolution reaction (HER). Three different types vacancies basal plane are explored through multi-step mechanism involving dissociative adsorption water molecule and subsequent electrochemical dissociated proton. Co-formation in both Ni S sites is found to be most effective enhancing performance monolayer. A key resource thermodynamics S-substitution-like physisorption vacant site, followed by occupation OH H into elements, boosted NiS di-vacancy configuration with low activation energy barriers. Investigation reveals highest contribution bonding orbitals monolayer-H bond makes it desirable approach transition metal phosphorus chalcogenides high HER activities. Overall, this highlights significance controlled augmenting catalysts HER.

Language: Английский

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