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Article Abstract
Hydroxy radical (⋅OH) is a prestigious oxidant that allows the cleavage of strong chemical bonds of methane but is untamed, leading to over-oxidation of methane and waste of oxidants, especially at high methane conversion. Here, we managed to buffer ⋅OH in an aqueous solution of photo-irradiated Fe, where ⋅OH almost participates in methane oxidation. Due to the interaction between Fe and SO , the electron transfer from OH to excited-state Fe for ⋅OH generation is retarded, while excessive ⋅OH is consumed by generated Fe to restore Fe. When combined with a Ru/SrTiO:Rh photocatalyst, the buffered ⋅OH converts methane to C hydrocarbons and H with formation rates of 246 and 418 μmol h, respectively. The apparent quantum efficiency reaches 13.0±0.2 %, along with 10.2 % methane conversion and 81 % C selectivity after 80 hours of reaction. Overall, this work presents a strategy for controlling active radicals for selective and efficient photocatalysis.
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