Photocatalytic Water Splitting

The increasing global demand for clean and renewable energy sources has prompted extensive research into the development of efficient and sustainable methods for producing hydrogen. An emerging technology called photocatalytic water splitting shows great promise in utilizing solar energy to decompose water into hydrogen and oxygen. This chapter provides a detailed overview of the fundamental principles, progress, obstacles, and future prospects of photocatalytic water splitting. The discussion revolves around the photoelectrochemical and photocatalytic processes employed to harness solar energy for water splitting, with a focus on the critical factors that affect overall efficiency. Various noteworthy photocatalysts, including metal oxides, metal sulfides, and organic semiconductors, are examined in terms of their electronic structures and photocatalytic mechanisms. Key challenges such as limited solar absorption, charge carrier recombination, low quantum efficiency, and catalyst stability are also highlighted. To tackle these challenges, strategies like bandgap engineering, co-catalyst optimization, and the development of tandem photoelectrodes are explored. Furthermore, insights are provided into the integration of photocatalytic systems with energy storage and fuel cell technologies. The chapter concludes by offering a glimpse into future directions, including emerging fields such as artificial photosynthesis, plasmonic photocatalysis, and photoelectrochemical tandem systems. By covering these topics, the book chapter aims to serve as a comprehensive reference for researchers, students, and professionals interested in the field of photocatalytic water splitting. Its primary goal is to foster a deeper understanding of the fundamental principles, advanced materials, and challenges associated with this technology, while also emphasizing its potential as a crucial contributor to achieving a sustainable and clean energy future.