Enhancing Interfacial Dynamic Stability Through Accelerated Reconstruction to Inhibit Iron‐Loss During Initial Electrochemical Activation

Author:

Lin Yan12,Ren Hao1,Zhang Siyu1,Liu Sijia1,Zhao Tingting1,Jiang Wen‐Jie3,Zhou Weidong4ORCID,Hu Jin‐Song5,Li Zhongtao1

Affiliation:

1. State Key Laboratory of Heavy Oil Processing College of Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China

2. Department of Chemistry Tsinghua University Beijing 100084 P. R. China

3. Department of Chemical Engineering The University of Melbourne Parkville VIC 3010 Australia

4. Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic‐Inorganic Composites Beijing University of Chemical Technology Beijing 100029 P. R. China

5. Beijing National Laboratory for Molecular Sciences (BNLMS) Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 P. R. China

Abstract

AbstractHighly active oxygen evolution reaction (OER) electrocatalysts, such as those containing Fe, often face the challenge of severe dissolution of active elements. Addressing this concern through the establishment of a dynamically stable interface during OER presents a promising strategy, achieved by manipulation of catalyst components. Herein, the findings reveal that Fe loss during OER predominantly occurs during the initial activation phase, marked by irreversible structural distortion that disrupts interfacial dynamical stability. By investigating the structural evolution of Fe‐containing Prussian blue analogs, serving as a model OER precatalyst, the correlation between precatalyst structural changes and interfacial dynamic stability is elucidated. Utilizing thermal annealing of CoFe bimetal Prussian blue, favorable thermodynamic conditions are induced for generating cyano vacancies within the matrix, thereby facilitating enhanced initial activation during OER. Consequently, catalytically active and stable oxyhydroxide species rapidly form at the interface, exhibiting robust interactions with interfacial Fe elements to stabilize interface dynamics. Suppression of the irreversible structural distortion responsible for active element loss during initial activation culminates in enhanced OER activity and stability.

Funder

National Key Research and Development Program of China

Australian Research Council

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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