Oxygen Gas Nanovessel\nPromotes Hydrogen Peroxide Photosynthesis

Harnessing sunlight to drive the two-electron reduction\nof oxygen\npresents a promising approach for on-site H<sub>2</sub>O<sub>2</sub> generation. However, the efficacy of this process is hampered by\nits low solubility and inadequate supply of O<sub>2</sub> in water.\nTo address this challenge, we introduce an O<sub>2</sub> gas nanovessel\nstrategy to enhance O<sub>2</sub> availability during H<sub>2</sub>O<sub>2</sub> photosynthesis. These O<sub>2</sub> nanovessels composed\nof silica zeolite can adsorb and store O<sub>2</sub> and then swiftly\nrelease it as dissolved O<sub>2</sub> when needed during photosynthesis.\nThis approach leads to a remarkable 3.0-fold increase in H<sub>2</sub>O<sub>2</sub> yield by the CoO<sub><i>x</i></sub>/Mo:BiVO<sub>4</sub>/Pd system, achieving a high apparent quantum yield of 13%\nat 375 nm and a solar-to-H<sub>2</sub>O<sub>2</sub> conversion efficiency\nof 0.6% at full spectrum in pure water under ambient air conditions.\nOur findings present a viable solution to the O<sub>2</sub> limitation\nbottleneck in H<sub>2</sub>O<sub>2</sub> photosynthesis and hold potential\nfor application in other gas-limited photosynthetic systems.