Oxygen-oxygen bond cleavage enables efficient photocatalytic H<sub>2</sub>O<sub>2</sub> production via an *O<sub>2</sub> dissociation pathway.
basic_science · Level V
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- Record sourced from PubMed, PMID 42248847.
- Also identified by DOI 10.1038/s41467-026-73685-x.
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Abstract
Photocatalytic reduction of O<sub>2</sub> to H<sub>2</sub>O<sub>2</sub> is generally regarded to proceed through the *O<sub>2</sub> hydrogenation pathway (*O<sub>2</sub> → *OOH), which inevitably encounters a high energy barrier proton extraction process via cleavage of the H-O bond in H<sub>2</sub>O. Designing a K and Cs co-modified polymeric carbon nitride (CN-KCs) to create dual-end adsorption sites as frustrated Lewis pairs for O<sub>2</sub>, on which the O-O breaking energy is significantly reduced and a *O<sub>2</sub> dissociation pathway towards photocatalytic H<sub>2</sub>O<sub>2</sub> synthesis is realized (*O<sub>2</sub> → 2*O, then *O + *H<sub>2</sub>O → H<sub>2</sub>O<sub>2</sub>). The CN-KCs presents a competitive photocatalytic H<sub>2</sub>O<sub>2</sub> yield of 1806.6 μmolh<sup>-1</sup>, a high quantum efficiency of 72.3% at 420 nm, and a solar-to-H<sub>2</sub>O<sub>2</sub> conversion efficiency of 6.1% with presence of biomass derivative. Here, we show that regulating dual-end adsorption sites opens a door to new *O<sub>2</sub> dissociation avenue for efficient conversion of O<sub>2</sub> to H<sub>2</sub>O<sub>2</sub>.