Co(OH)2-Modified CuO Nanoparticles Enabling High-Efficiency Photoinduced Charge Transfer toward the Water Oxidation Reaction

  • Jia Guo
    Jia Guo
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
    Xinjiang Industry Technical College, Urumqi 830021, China
    More by Jia Guo
  • Liugen Zhang
    Liugen Zhang
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
    More by Liugen Zhang
  • Wenlan Ma
    Wenlan Ma
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
    More by Wenlan Ma
  • Tinxiang Chen
    Tinxiang Chen
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
  • Guangyao Wang
    Guangyao Wang
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
  • Naeem Akram
    Naeem Akram
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
    More by Naeem Akram
  • Yi Zhang
    Yi Zhang
    Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China
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  • , and 
  • Jide Wang*
    Jide Wang
    Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering of Xinjiang University, Urumqi 830046, China
    *E-mail: [email protected]
    More by Jide Wang
Cite this: Ind. Eng. Chem. Res. 2019, 58, 49, 22236–22243
Publication Date (Web):November 18, 2019
https://doi.org/10.1021/acs.iecr.9b05346
Copyright © 2019 American Chemical Society
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Abstract

A kind of Co(OH)2-modified CuO nanoparticles (Co(OH)2/CuO) was found to be a robust catalyst for the water oxidation reaction (WOR) in sacrificial oxidant conditions without any photosensitizers since this conjunction possessed both catalytic sites and visible light absorption centers. Under the synergetic effect between Co(OH)2 and CuO clusters, Co(OH)2/CuO afforded an excellent high oxygen output ratio (1955 μmol·h–1·g–1). According to electron spin resonance measurements and radical capture experiments, sulfate radicals were confirmed as the main active species. The results of DFT simulations demonstrated that Co(OH)2/CuO was a kind of metal–semiconductor complex, which was inclined to transfer charge carriers across the interface efficiently and unidirectionally. Based on the locations of the valence band and conduction band, the mechanism of the photocatalytic WOR was proposed. We hope that this contribution will offer useful guidance for developing efficient photoinduced charge-transfer water-oxidation catalysts without photosensitizers.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.iecr.9b05346.

  • Kinetics of O2 evolution of the chemical system using CuO as a catalyst, XPS spectra, HRTEM images, FESEM maps, main parameters of gas chromatography, and details on the oxygen detected by different GC methods (PDF)

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