Highly Efficient Photocatalytic HO Production under Ambient Conditions via Defective InS Nanosheets.

Oxygen and water generating hydrogen peroxide (HO) by optical drive is an extremely promising pathway, and the large amount of oxygen in air and natural sunlight illumination are excellent catalytic conditions. However, the separation efficiency of photogenerated electron-hole pairs greatly limits the photocatalytic efficiency, especially in the absence of sacrificial agents. Here, we report an InS nanosheet with an S vacancy (S-InS). The highest HO yield of S-InS is 2.585 mmol g h under pure water, air, and sunlight ( = 920 W/m), largely outperforming other reported photocatalysts for HO production. The experimental results show that the introduction of S accelerates the separation of photogenerated electron-hole pairs and achieves efficient HO production through an oxygen reduction reaction. This efficient photosynthesis under ambient conditions allows solar-chemical conversion to take place in a truly cost-effective and sustainable way, opening up possibilities for practical production.