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Issue 3, 2018
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Z-Scheme in a Co3(PO4)2/α-Fe2O3 photocatalysis system for overall water splitting under visible light

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Abstract

Overall water splitting under solar irradiation with a semiconductor has long been investigated as an attractive pathway to convert solar energy into chemical energy in the form of H2. However, using only a single semiconductor as a photocatalyst remains a great challenge. Designing Z-scheme systems is the most common method used for photocatalysis. We report a Z-scheme Co3(PO4)2/α-Fe2O3 structure as an efficient photocatalyst for overall water splitting under visible light. The as-prepared Co3(PO4)2/α-Fe2O3 photocatalyst shows excellent improvement in visible light absorption and photocatalytic efficiency for overall water splitting, in which Co3(PO4)2 and Fe2O3 act as H2-evolving and O2-evolving photocatalysts, respectively. By varying the amount of α-Fe2O3 in the photocatalysts, we found that Co3(PO4)2/α-Fe2O3-1.6% exhibited the optimal photocatalytic activity in hydrogen production (0.63 μmol h−1) and oxygen evolution (0.32 μmol h−1), which is almost 35-fold higher than that of a pure Co3(PO4)2 catalyst. In addition, the chemical stoichiometric ratio of H2 and O2 in the photocatalysis process is almost 2 : 1. The enhanced photocatalytic activity was attributed to the synergetic effects of Co3(PO4)2 and α-Fe2O3 in the Z-scheme structure, which resulted in highly efficient separation of photogenerated charge carriers.

Graphical abstract: Z-Scheme in a Co3(PO4)2/α-Fe2O3 photocatalysis system for overall water splitting under visible light

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Publication details

The article was received on 14 Nov 2017, accepted on 28 Dec 2017 and first published on 28 Dec 2017


Article type: Paper
DOI: 10.1039/C7CY02323E
Citation: Catal. Sci. Technol., 2018,8, 840-846
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    Z-Scheme in a Co3(PO4)2/α-Fe2O3 photocatalysis system for overall water splitting under visible light

    M. Han, L. Hu, Y. Zhou, S. Zhao, L. Bai, Y. Sun, H. Huang, Y. Liu and Z. Kang, Catal. Sci. Technol., 2018, 8, 840
    DOI: 10.1039/C7CY02323E

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