Breaking the Ru−O−Ru Symmetry of a RuO2 Catalyst for Sustainable Acidic Water Oxidation

Proton exchange membrane water electrolysis is a highly promising hydrogen production technique for sustainable energy supply, however, achieving a highly active and durable catalyst for acidic water oxidation still remains a formidable challenge. Herein, we propose a local microenvironment regulati...

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Published inAngewandte Chemie International Edition Vol. 63; no. 3; pp. e202316903 - n/a
Main Authors Wang, Yi, Lei, Xue, Zhang, Bo, Bai, Bing, Das, Pratteek, Azam, Tasmia, Xiao, Jianping, Wu, Zhong‐Shuai
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 15.01.2024
EditionInternational ed. in English
Subjects
Acidic oxides
Acidic water
Acidic Water Oxidation
Asymmetric Active Structure
Asymmetry
Catalysts
Electrochemistry
Electrolysis
Free energy
Graphene
Heat of formation
Hydrogen production
Microenvironments
Oxidation
Oxygen Evolution
Oxygen evolution reactions
Ruthenium oxide
Stability
Sustainable energy
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Summary:Proton exchange membrane water electrolysis is a highly promising hydrogen production technique for sustainable energy supply, however, achieving a highly active and durable catalyst for acidic water oxidation still remains a formidable challenge. Herein, we propose a local microenvironment regulation strategy for precisely tuning In−RuO2/graphene (In−RuO2/G) catalyst with intrinsic electrochemical activity and stability to boost acidic water oxidation. The In−RuO2/G displays robust acid oxygen evolution reaction performance with a mass activity of 671 A gcat−1 at 1.5 V, an overpotential of 187 mV at 10 mA cm−2, and long‐lasting stability of 350 h at 100 mA cm−2, which arises from the asymmetric Ru−O−In local structure interactions. Further, it is unraveled theoretically that the asymmetric Ru−O−In structure breaks the thermodynamic activity limit of the traditional adsorption evolution mechanism which significantly weakens the formation energy barrier of OOH*, thus inducing a new rate‐determining step of OH* absorption. Therefore, this strategy showcases the immense potential for constructing high‐performance acidic catalysts for water electrolyzers. The asymmetric Ru−O−In active structure exhibits impressive electrocatalytic performance for acid oxygen evolution reaction, which is significantly enhanced by the contracted Ru−O bond compared to RuO2.
Bibliography:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202316903