Electron and ion behaviors at the graphene/metal interface during the acidic water electrolysis

Author:

Xu Yue1ORCID,He Yingjian1ORCID,Wang Shaofeng1ORCID,Wu Zhaomeng1ORCID,Hu Haolin1ORCID,Jeong Samuel2ORCID,Lin Xi13ORCID,Hu Kailong13ORCID

Affiliation:

1. School of Materials Science and Engineering, and Institute of Materials Genome and Big Data, Harbin Institute of Technology Shenzhen 1 , Shenzhen 518055, People's Republic of China

2. Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba 3 , Tsukuba 305-8573, Japan

3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology 2 , Harbin 150001, People's Republic of China

Abstract

Hydrogen produced via proton exchange membrane (PEM) water electrolysis has been considered as one of the most promising alternatives to store and convert energy derived from renewable sources. The acidic environment within the PEM electrolyzer poses challenges to the metal-based electrocatalysts employed in both cathode and anode, necessitating a high level of corrosion resistance. This review provides a comprehensive overview of the emerging graphene-encapsulated metals in catalyzing cathodic and anodic reactions of water electrolysis under acidic media. The two major behaviors occurring at the graphene/metal interface, i.e., the electron transfer and ionic penetration, are systematically discussed owing to the experimental results and computational simulations. The correlation between the graphene shell and underlying metal, as well as their impact on the electron and ion behaviors, is further revealed. The mechanisms governed by the electron and ion behaviors are proposed for graphene encapsulated metal catalysts, providing valuable insights toward the design of cutting-edge metal catalysts for the acidic water electrolysis.

Publisher

AIP Publishing

Subject

General Earth and Planetary Sciences,General Engineering,General Environmental Science

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