Green Hydrogen Generation by Water Electrolysis

Water electrolysis, which exploits electrical power to split H 2 O, is an effective and rapidly progressing strategy for renewable energy consumption and large-scale green H 2 generation. Nevertheless, various electrolysis techniques confront certain advantages and challenges, including prolonged stability but inadequate performance, and enhanced reaction thermodynamics and kinetics whereas attendant accelerated degradation or increased cost for dependence on precious metals, and are at their specific stage of development. In this chapter, a brief introduction is first proposed, and the fundamental insights of water electrolysis are presented. Subsequently, evaluations of alkaline electrolysis cell (AEC), polymer electrolyte membrane electrolysis cell (PEMEC), together with the frontier research focusing on elevated temperature AEC (ET-AEC) and ET-PEMEC, as well as protonic ceramic electrolysis cell (PCEC) and solid oxide electrolysis cell (SOEC) are sequentially performed, which cover studies concentrating on electrodes and electrolytes, analysis of performance and stability, as well as opportunities and challenges for development and operation of stacks and systems.