The article discusses the significant advancements in enhancing the efficiency of photocatalytic water splitting processes through innovative doping strategies. By introducing dopants to regulate band structures, micro-morphology, and surface properties of photocatalysts, researchers have achieved improved hydrogen production by enhancing the overall water splitting process. Various studies have demonstrated the success of doping, with examples like nitrogen doping in TiO2 and gallium-zinc nitrogen oxide for visible light water splitting. The integration of rare earth elements into bismuth-based composite oxides, particularly through Selected Local Gradient Doping, has shown promise in controlling ion release and enhancing energy conversion efficiency. Prof. Wenfeng Shangguan's team from Shanghai Jiao Tong University has contributed significantly to this field by providing a comprehensive review of doping strategies, defect regulation, and energy band structure studies. Their research aims to achieve overall water splitting under visible light conditions, with the potential for novel materials exploration and improved energy conversion efficiency. The article was published in the Chinese Journal of Catalysis, emphasizing the importance of these advancements in the field of catalysis and materials science.