Chinese Journal of Catalysis ›› 2025, Vol. 77: 4-19.DOI: 10.1016/S1872-2067(25)64783-8

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Ultrathin two-dimensional electrocatalysts: Structure-property relationships, mechanistic insights, and applications in water electrolysis

Lina Wanga, Muhan Naa, Ruofei Dua, Xiujin Wanga, Boyang Yua, Lan Yangb, Hui Chena,*(), Xiaoxin Zoua,*()   

  1. aState Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, Jilin, China
    bBeijing Institute of Smart Energy, Beijing 102209, China
  • Received:2025-05-15 Accepted:2025-06-30 Online:2025-10-18 Published:2025-10-05
  • Contact: *xxzou@jlu.edu.cn (X. Zou), chenhui@jlu.edu.cn (H. Chen).
  • About author:Hui Chen has received his Ph.D. in materials science from Jilin University (China) in June 2018, and completed his postdoctoral training at College of Chemistry, Jilin University from June 2018 to November 2022. He is currently a professor at the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry in Jilin University. His research interests are in catalytic materials for water electrolysis technologies, including alkaline water electrolyzer (AWE) and proton exchange membrane water electrolyzer (PEMWE). Some of his recent progresses include (i) the development of low‐iridium oxygen‐evolution catalysts and anode catalyst layers for PEMWEs, and (ii) the large‐area synthesis of highly active and stable nickel-based electrodes for AWEs. He has authored 40+ peer-reviewed papers and 10 patents.
    Xiaoxin Zou (State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University) has received his PhD in inorganic chemistry from Jilin University in June 2011, and then moved to the University of California, Riverside, and Rutgers, The State University of New Jersey, as a postdoctoral scholar from July 2011 to October 2013. He is currently a professor at the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry in Jilin University. His research interests are in hydrogen energy materials chemistry, comprising the elucidation of the atomic basis for water splitting electrocatalysts, prediction and searching of efficient catalysts with novel crystal structures and preparative technology of industrial water splitting catalysts.
  • Supported by:
    State Grid Headquarter Science and Technology project(5419-202320652A-3-2-ZN)

Abstract:

The pursuit of sustainable hydrogen production has positioned water electrolysis as a cornerstone technology for global carbon neutrality. However, sluggish kinetics, catalyst scarcity, and system integration challenges hinder its widespread deployment. Ultrathin two-dimensional (2D) materials, with their atomically exposed surfaces, tunable electronic structures, and defect-engineering capabilities, present unique opportunities for next-generation electrocatalysts. This review provides an integrated overview of ultrathin 2D electrocatalysts, discussing their structural diversity, synthetic routes, structure-activity relationships, and mechanistic understanding in water electrolysis processes. Special focus is placed on the translation of 2D materials from laboratory research to practical device implementation, emphasizing challenges such as scalable fabrication, interfacial engineering, and operational durability in realistic electrolyzer environments. The role of advanced characterization techniques in capturing dynamic structural changes and active site evolution is discussed. Finally, we outline future research directions, emphasizing the synergy of machine learning-driven materials discovery, advanced operando characterization, and scalable system integration to accelerate the industrial translation of 2D electrocatalysts for green hydrogen production.

Key words: Two-dimensional material, Water splitting reaction, Electrocatalysis, Catalytic mechanism, Electrolyzer