Novel materials and techniques for photocatalytic water splitting developed by Professor Kazunari Domen

Abstract

ABSTRACT

Professor Kazunari Domen at the Shinshu University and the University of Tokyo has pioneered materials and techniques for solar-driven water splitting using photocatalysts, a promising technology for contributing to the construction of a sustainable and carbon-neutral society. In this paper, we summarize his groundbreaking contributions to photocatalytic water splitting and, more broadly, photocatalytic research. We highlight various novel functional photocatalytic materials, including oxides, (oxy)nitrides, and oxysulfides, along with innovative techniques such as cocatalyst engineering and Z-scheme system construction developed by the Domen Group. His team has also pioneered readily accessible and cost-effective photo(electro)chemical device fabrication methods, such as the particle-transfer method and thin-film-transfer method. Furthermore, their research has made significant contributions to understanding the (photo)catalytic mechanisms using advanced characterization techniques. Together with his research team, Professor Domen has set many milestones in the field of photocatalytic overall water splitting, notably demonstrating the first scalable and stable 100 m² solar H₂ production system using only water and sunlight. His work has revealed the potential for practical solar H₂ production from water and sunlight, and highlighted the application of fundamental principles, combined with chemical and materials science tools, to design effective photocatalytic systems. Through this review, we focus on his research and the foundational design principles that can inspire the development of efficient photocatalytic systems for water splitting and solar fuel production. By building on his contributions, we anticipate a significant impact on addressing major global energy challenges.