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Cobalt Phosphate Cocatalyst Loaded-CdS Nanorod Photoanode with Well-Defined Junctions for Highly Efficient Photoelectrochemical Water Splitting

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Abstract

Cocatalysts play important roles in photocatalytic and photoelectrochemical water splitting reactions. However, the formation of well-defined junctions between low dimensional semiconductors and cocatalysts is still challenging. In this study, CdS nanorod photoanodes loaded with cobalt phosphate (CoPi) cocatalyst were synthesized by a facile two-step route, in which CdS nanorods were prepared using a hydrothermal method followed by photo-assisted electrodeposition of CoPi. It was found that the formation of intimate junctions between CoPi and CdS nanorods in the form of Co–S bonding effectively facilitated the charge separation and lowered the activation energy of the water oxidation reaction. This resulted in highly efficient and stable photoelectrochemical water splitting on the CdS photoanode. The optimal CdS/CoPi photoanode showed a maximum photocurrent of 4.7 mA/cm2 at 0 V versus reversible hydrogen electrode under an AM 1.5 G solar simulator, which was 5.5-fold higher than that of bare CdS photoanode. This work expands the potential application of the cocatalyst CoPi in CdS photoanode systems and improves our understanding of the nature of cocatalysts with well-defined interface junctions in semiconductors.

Graphic Abstract

Well-defined interfacial junction with Co–S bonding over cobalt phosphate cocatalyzed CdS nanorod photoanode facilitates the charge separation and lowers the activation energy, thus achieving a considerable photocurrent of 4.7 mA/cm2 at 0 V vs. RHE.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFB0700205), the National Natural Science Foundation of China (Grant Nos. U1632273, U1832165, 201902001), Foundation from Key Laboratory of Photovoltaic and Energy Conservation, CAS (Grant No. PECL2018KF012), Hefei Center for Physical Science and Technology (Grant No. 2016FXZY002), and Anhui Provincial Natural Science Foundation (Grant No. 17080885MB46). The authors thank the staff at 4B7A endstation in BSRF for their assistance in acquiring XAFS data.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, Anhui, China

    Zhimin Song, Yusheng Zeng, Azhu Wang, Shikuo Li, Mengdie Cai, Qin Cheng, Yuxue Wei & Song Sun

  2. National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei, 230029, Anhui, China

    Zhimin Song, Xiaodi Zhu, Yi Fan & Song Sun

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  1. Zhimin Song
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Song, Z., Zhu, X., Zeng, Y. et al. Cobalt Phosphate Cocatalyst Loaded-CdS Nanorod Photoanode with Well-Defined Junctions for Highly Efficient Photoelectrochemical Water Splitting. Catal Lett 150, 1878–1889 (2020). https://doi.org/10.1007/s10562-019-03084-z

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