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Advanced bi-functional CoPi co-catalysts decorated g-C3N4 nanosheets coupled with ZnO nanorods arrays as integrated photoanodes

Abstract

In this work, CoPi decorated type II heterojunction which is composed of one dimensional (1D) ZnO nanorod arrays (NRAs) coated with two dimensional (2D) carbon nitride (g-C3N4) photoanode was successfully prepared. CoPi has been speculated to be a mixture of amorphous compound and two cobalt-based compounds: Co3(PO3)6•14H2O and Co(H2PO2)2•6H2O. Advanced bi-functional CoPi like a shelter effectively inhibiting the photo corrosion of CNNS/ZnO NRAs and provides a faster holes transfer channel. Synergy effect at the interface of the heterojunction can efficiently improve the separation of charge carriers from photoexcited g-C3N4 nanosheets to ZnO nanorod. Photocurrent density is also greatly enhanced by loading CoPi on CNNS/ZnO NRAs heterojunction. The maximum photocurrent density (2.45 mA cm-2 at 1.23 V vs. RHE) generated from CoPi(10)-CNNS(600)/ZnO nanorods is about 10.2 times greater than that of pristine ZnO nanorods (0.25 mA cm-2 at 1.23 V vs. RHE) and 2.4 times higher than that of CNNS(800)/ZnO (0.95 mA cm−2 at 1.23 V vs. RHE). The further increasing of photoelectrocatalytic performance may be attributed to CoPi relieved charge accumulation at the semiconductor/electrolyte decreases the electron-hole recombination rate.

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Publication details

The article was received on 07 Jul 2017, accepted on 17 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C7DT02459B
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Advanced bi-functional CoPi co-catalysts decorated g-C3N4 nanosheets coupled with ZnO nanorods arrays as integrated photoanodes

    C. Liu, P. C. Wu, K. Wu, G. Meng, J. Wu, J. Hou, Z. Liu and X. Guo, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT02459B

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