S-Scheme Heterojunction Photocatalysts for H 2 O 2 Production

Photocatalysis opens a new door to H O formation via a low-cost, clean, mild, and sustainable process, which holds great promise for the next generation of massive H O production. However, fast photogenerated electron-hole recombination and slow reaction kinetics are the main obstacles for its practical application. An effective solution is to construct the step-scheme (S-scheme) heterojunction, which remarkably promotes carrier separation and boosts the redox power for efficient photocatalytic H O production. Considering the superiority of S-scheme heterojunctions, this Perspective summarizes the recent advances of S-scheme photocatalysts for H O production, including photocatalysts for building S-scheme heterojunctions, H O -production performance, and S-scheme photocatalytic mechanisms. Lastly, some prospects are given to motivate future research in this promising field, other promising strategies are provided to further improve H O yields, and future research directions are suggested.