Triphasic Metal Oxide Photocatalyst for Reaction Site-Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

Kim Keon-Han; Kim Se-Jun; Choi Won HoLee HeebinMoon Byeong CheulKim Gi HwanChoi Jae WonPark Dong GyuChoi Jong HuiKim HyungjunKang Jeung Ku

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Triphasic Metal Oxide Photocatalyst for Reaction Site-Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

机译：Triphasic Metal Oxide Photocatalyst for Reaction Site-Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

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The search for photocatalysts allowing the highly active, selective, and stable conversion of molecular oxygen into hydrogen peroxide is of worldwide interest. Here, the authors report the efficient conversion of O-2 into H2O2 with approximate to 100% selectivity and stable cycle stability by a triphasic metal oxide photocatalyst with a cobalt hydroxide carbonate nanosheet phase for water oxidation as well as iron oxide and titanium oxide phases of a core-shell morphology for charge transfer and oxygen reduction, denoted as CFT. The different surface energies of 0.78 (anatase) and 0.93 J m(-2) (rutile) for titanium oxide and 1.39 J m(-2) for iron oxide result in a core-shell morphology. The band gaps for iron oxide (2.02 eV), titanium oxide (approximate to 3 eV), and cobalt hydroxide carbonate (3.80 eV) sites reveal that the CFT photocatalyst allows visible-to-UV light absorption. The O-18(2) isotope-labeling experiments prove that the core-shell structure promotes hole transfer toward the water oxidation site. Additionally, the hole-induced H2O2 decomposition at the oxygen reduction site is efficiently hindered. Moreover, the photogenerated electrons transfer toward the oxygen reduction site to produce H2O2 from O-2 with approximate to 10-fold higher activity than those by conventional single- or dual-phase photocatalysts, while giving robust cycle stability.

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《Advanced energy materials》 |2022年第18期|2104052.1-2104052.10|共10页
作者
Kim Keon-Han; Kim Se-Jun; Choi Won HoLee HeebinMoon Byeong CheulKim Gi HwanChoi Jae WonPark Dong GyuChoi Jong HuiKim HyungjunKang Jeung Ku;
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Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn MSE, 291 Daehak Ro, Daejeon 34141, South Korea|Korea Adv Inst Sci & Technol, NanoCentury Inst, 291 Daehak Ro, Daejeon 34141, South Korea;

Korea Inst Sci & Technol KIST, Clean Energy Res Ctr, 5 Hwarang Ro 14 Gil, Seoul 02792, South Korea;

Korea Adv Inst Sci & Technol KAIST, Dept Chem, 291 Daehak Ro, Daejeon 34141, South KoreaKorea Adv Inst Sci & Technol, Dept Mat Sci & Engn MSE, 291 Daehak Ro, Daejeon 34141, South Korea|Korea Adv Inst Sci & Technol, NanoCentury Inst, 291 Daehak Ro, Daejeon 34141, South Korea|Univ Oxford, Dept Chem, 12 Mansfield Rd, Oxford OX1 3TA, England;

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正文语种英语
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charge transfer; DFT simulations; H; O-2; (2) production; in-situ experimental analysis; oxygen reduction; triphasic metal-oxide photocatalysts; water oxidation;

Triphasic Metal Oxide Photocatalyst for Reaction Site-Specific Production of Hydrogen Peroxide from Oxygen Reduction and Water Oxidation

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