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Updated: Jun 7, 2026

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
Oxygen-oxygen bond cleavage enables efficient photocatalytic H2O2 production via an *O2 dissociation pathway
Qiong Liu1,2, Tianxiang Chen3, Tsz Woon Benedict Lo3
1College of Environment and Climate, Guangdong Provincial Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, China.
Abstract:
Photocatalytic reduction of O2 to H2O2 is generally regarded to proceed through the *O2 hydrogenation pathway (*O2 → *OOH), which inevitably encounters a high energy barrier proton extraction process via cleavage of the H-O bond in H2O. Designing a K and Cs co-modified polymeric carbon nitride (CN-KCs) to create dual-end adsorption sites as frustrated Lewis pairs for O2, on which the O-O breaking energy is significantly reduced and a *O2 dissociation pathway towards photocatalytic H2O2 synthesis is realized (*O2 → 2*O, then *O + *H2O → H2O2). The CN-KCs presents a competitive photocatalytic H2O2 yield of 1806.6 μmolh-1, a high quantum efficiency of 72.3% at 420 nm, and a solar-to-H2O2 conversion efficiency of 6.1% with presence of biomass derivative. Here, we show that regulating dual-end adsorption sites opens a door to new *O2 dissociation avenue for efficient conversion of O2 to H2O2.
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