Chinese Journal of Catalysis ›› 2024, Vol. 56: 1-8.DOI: 10.1016/S1872-2067(23)64572-3

• Perspectives •     Next Articles

General definition of hydrogen energy and related electrochemical technologies

Gongwei Wanga, Li Xiaoa,b, Lin Zhuanga,c,*()   

  1. aCollege of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources, Wuhan University, Wuhan 430072, Hubei, China
    bSauvage Center for Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, China
    cThe Institute for Advanced Studies, Wuhan University, Wuhan 430072, Hubei, China
  • Received:2023-09-23 Accepted:2023-11-16 Online:2024-01-18 Published:2024-01-10
  • Contact: *E-mail: lzhuang@whu.edu.cn (L. Zhuang).
  • About author:Lin Zhuang is the Chuan-Sin Cha Chair Professor and Dean in College of Chemistry and Molecular Sciences at Wuhan University, China. He received Ph.D. at Wuhan University in 1998, and was a visiting scientist at Cornell University in 2004-2005. His research focuses on electrocatalysis and hydrogen energy technology, in particular alkaline polymer electrolyte fuel cells, water electrolysis, and CO2 electrolysis.
  • Supported by:
    National Natural Science Foundation of China(21991154);National Natural Science Foundation of China(21991150);National Natural Science Foundation of China(22172115);National Natural Science Foundation of China(92045302);Fundamental Research Funds for the Central Universities(2042022kf1174);Fundamental Research Funds for the Central Universities(2042021kf1064)

Abstract:

Electrochemical energy conversion, based on the transformation between electrical energy and chemical energy, is crucial for the storage and utilization of renewable electrical energy, as well as the eco-friendly production of valuable fuels and chemicals. Here we put forward a general definition of hydrogen energy that covers the energy storage/release in any hydrogen-involved chemical bonds, such as H-H, C-H, and N-H bonds. Given that H2 gas, hydrocarbons, and hydronitrogens are not only high-energy-density fuels but also important industrial feedstocks, the successful implementation of efficient energy storage/release in the H-H (hydrogen cycle), C-H (carbon cycle), and N-H (nitrogen cycle) bonds are of great significance in establishing sustainable energy systems and reducing dependence on fossil fuels, which contributes to address global energy crisis and environmental problems. We provide a concise overview of the current development status of some key low-temperature (< 100 °C) electrochemical technologies relevant to general hydrogen energy, including fuel cells, water electrolysis, CO2 electrolysis, and N2 electrolysis. This discussion aims to elucidate the major challenges and future trends in this field.

Key words: Hydrogen energy, Fuel cells, Water electrolysis, CO2 electrolysis, N2 electrolysis