Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 20, Pages 5016-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201704512
Keywords
hydrogen peroxide; photocatalyst; two-electron oxidation of water; two-electron reduction of dioxygen; water oxidation catalyst
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Funding
- SENTAN project from Japan Science and Technology Agency (JST)
- JSPS KAKENHI [16H02268]
- NRF of Korea through CRI [NRF-2012R1A3A2048842]
- GRL [NRF-2010-00353]
- Basic Science Research Program [2017R1D1A1B03029982, 2017R1D1A1B03032615]
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Hydrogen peroxide, which is a green oxidant and fuel, is produced by a two-electron/two-proton reduction of dioxygen, two-electron/two-proton oxidation of water, or a combination of four-electron/four-proton or/and two-electron/two-proton oxidation of water and two-electron/two-proton reduction of dioxygen. There are many reports on electrocatalysts for selective two-electron/two-proton reduction of dioxygen to produce hydrogen peroxide instead of four-electron/four-proton reduction of dioxygen to produce water. As compared with the two-electron/two-proton reduction of dioxygen to produce hydrogen peroxide, fewer catalysts are known for the selective two-electron/two-proton oxidation of water to produce hydrogen peroxide instead of four-electron/four-proton oxidation of water to evolve dioxygen. Thus, solar-driven production of hydrogen peroxide mainly consists of the catalytic four-electron/four-proton oxidation of water and the catalytic two-electron/two-proton reduction of dioxygen. The overall reaction is the solar-driven oxidation of water by dioxygen to produce hydrogen peroxide. Either or both the four-electron/four-proton or/and the two-electron/two-proton oxidation of water and the two-electron/two-proton reduction of dioxygen requires photocatalysts. The yield of hydrogen peroxide is improved when the compartment for the photocatalytic four-electron/four-proton or/and two-electron/two-proton oxidation of water is separated from that for the catalytic two-electron/two-proton reduction of dioxygen using a two-compartment cell separated by a membrane. The overall solar-driven oxidation of water by dioxygen, which is the greenest oxidant, to produce hydrogen peroxide can be combined with catalytic oxidation of various substrates by hydrogen peroxide
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