Highly efficient photosynthesis of hydrogen peroxide in ambient conditions.
basic_science · Level V
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- Record sourced from PubMed, PMID 33853952.
- Also identified by DOI 10.1073/pnas.2103964118 and PMC identifier 8072241.
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Abstract
Photosynthesis of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in ambient conditions remains neither cost effective nor environmentally friendly enough because of the rapid charge recombination. Here, a photocatalytic rate of as high as 114 μmol⋅g<sup>-1</sup>⋅h<sup>-1</sup> for the production of H<sub>2</sub>O<sub>2</sub> in pure water and open air is achieved by using a Z-scheme heterojunction, which outperforms almost all reported photocatalysts under the same conditions. An extensive study at the atomic level demonstrates that Z-scheme electron transfer is realized by improving the photoresponse of the oxidation semiconductor under visible light, when the difference between the Fermi levels of the two constituent semiconductors is not sufficiently large. Moreover, it is verified that a type II electron transfer pathway can be converted to the desired Z-scheme pathway by tuning the excitation wavelengths. This study demonstrates a feasible strategy for developing efficient Z-scheme photocatalysts by regulating photoresponses.