Efficient photosynthesis of H2O2 over β-ZrNBr nitrohalide nanosheets

Inorganic mixed-anion semiconductor photocatalysts are promising for water splitting due to their broad visible light absorption and structural stability. However, efficient photocatalytic production of hydrogen peroxide (H 2 O 2 ) remains challenging. This study reports a one-step photocatalytic method for H 2 O 2 production using the synthesized β-ZrNBr inorganic nanosheet photocatalyst, achieving an apparent quantum efficiency of 11.7% at 420 ± 10 nm and a solar-to-H 2 O 2 efficiency of 0.5%. This superior H 2 O 2 synthesis performance is attributed to efficient carrier mobility, high bulk charge carrier separation efficiency exceeding 70%, and the ability to directly promote water oxidation into H 2 O 2 . Additionally, 600 μmol L −1 g cat −1 of H 2 O 2 can be continuously generated over the β-ZrNBr film without significant decay under visible light in a homemade flow cell. Our work offers a scalable alternative for H 2 O 2 production using robust inorganic semiconductors under ambient conditions.