The accelerating global drive for clean energy has substantially increased interest in electrolyser technologies, especially for producing green hydrogen at scale. Once considered niche industrial equipment, electrolysers are now pivotal emerging technologies within the decarbonised energy landscape. For more than a century since the first commercial alkaline water electrolyser was introduced, continuous research and innovation have fueled major technological advances, giving rise to new electrolyser designs that prioritise efficiency, durability, and scalability. This book captures these developments, detailing recent advances across six different technologies at various stages of maturity. Featuring up-to-date perspectives from international researchers and entrepreneurs, it addresses the prospects and challenges of each specific technology. It also examines how these innovations can facilitate the use of renewable electricity to convert feedstocks such as water and carbon dioxide into valuable fuels and chemical products, thereby advancing the global journey toward a cleaner, more resilient, and more equitable energy future. Spanning fundamental principles to practical, applied insights, the book is a valuable resource for both newcomers and experts seeking to understand the rapidly evolving field of electrolyser technologies and their potential to contribute to the clean energy transition.

Chong-Yong Lee is a senior research fellow at the University of Wollongong, Australia. Following his PhD at Monash University, Australia, and postdoctoral work at the University of Erlangen-Nuremberg, Germany, and as a Marie Curie fellow at the University of Cambridge, UK, he assumed a UOW Vice-Chancellor’s fellowship position at the University of Wollongong in 2015. His research is centred on developing innovative solutions for sustainable clean energy, including electrolyser technology.

Gerhard F. Swiegers is an Australian Research Council Industry Laureate Fellow. Following his PhD at the University of Connecticut, USA, and postdoctoral work at the Australian National University, he joined the University of Wollongong in 1995. From 1998 to 2009, he was a principal research scientist at the Commonwealth Scientific and Industrial Research Organisation (CSIRO). In 2010, he returned to the University of Wollongong, specialising in the commercialisation of fundamental research and bridging the academia-to-industry divide.