Light driven water oxidation on silica supported NiO-TiO<sub>2</sub> heteronanocrystals yields hydrogen peroxide.

Artificial photosynthesis systems do not have this restriction, and there may be significant advantages in alternative water oxidation approaches, such as faster reaction kinetics and more valuable oxidation products. 27,28 For example, hydrogen peroxide can be used for metal-peroxide batteries, 29 disinfectant, or bleaching agent. 30–33 Though hydrogen peroxide can be formed by oxygen red

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