Oxygen Gas Nanovessel Promotes Hydrogen Peroxide Photosynthesis

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