The 5th National Symposium on Innovation and Application of Photocatalytic materials is an important academic conference in the field of scientific research and application of photocatalytic materials in China. It has been successfully held in Nanjing, Changsha, Jinan, Suzhou, and Changzhou for five sessions. The conference mainly focuses on academic exchanges and discussions in the fields of photoelectrochemistry and photoelectrocatalysis, photocatalytic organic synthesis and mechanism research, photocatalytic water splitting for hydrogen production, photocatalytic CO2 reduction, photocatalytic pollutant degradation, photocatalytic nitrogen fixation and environmental purification, new concepts, theories, and materials for nano photocatalyst design from both academic and application perspectives.