Review on the characteristics of existing hydrogen energy storage technologies
Sanfeng Wang, Zhewen Zhang, Yufan Tan, Kai Liang, Shenghan Zhang
Abstract
In this paper, the characteristics of current hydrogen storage technologies are reviewed from the aspects of hydrogen storage capacity, working conditions, reversibility, and safety. Among the technologies mentioned herein, N-containing liquid organic hydrogen carriers (N-containing LOHCs) are regarded as an ideal hydrogen storage medium because of their excellent hydrogen storage performance. However, N-containing LOHCs are mostly hydrogenated/dehydrogenated by traditional thermal catalysis, which requires strict reaction conditions (120 ~ 200°C; 6 ~ 7 MPa) and external hydrogen supply. Thermal catalysis has high energy consumption and certain safety risks. The electrochemical method can hydrogenate/dehydrogenate organic substrates under mild conditions (25 ~ 60°C; normal pressure) and does not require an external H2 supply. Therefore, electrochemical hydrogen storage technology based on N-containing LOHCs has great development potential.