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Cobalt(II)-Imidazoles Passivated α-Fe2O3 Photoanode for Enhanced Photoelectrochemical Water Oxidation

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Abstract

Two types of cobalt imidazole complexes, e.g. cobalt 2-methylimidazole (Co-MIm) and cobalt 1-ethylimidazole (Co-EIm), are adopted as surface passivation agents to modify the Sn-doped α-Fe2O3 nanorods (Sn-Fe2O3 NRs) photoanode by a facile impregnation method. Systematic characterizations are performed and the fabricated photoanodes are applied to photoelectrochemical (PEC) water oxidation. Interestingly, the cobalt imidazoles nanosheets are embedded into the Sn-Fe2O3 NRs film to form crack-like gaps and NRs bundles on the surface of the composite photoanodes, e.g. Co-MIm@Sn-Fe2O3 and Co-EIm@Sn-Fe2O3. With simulated sunlight irradiation and an applied potential of 1.23 V (vs. RHE), the photocurrent densities of the Co-EIm@Sn-Fe2O3 and Co-MIm@Sn-Fe2O3 reach 0.81 mA/cm2 and 0.61 mA/cm2 with enhanced stability, respectively, compared with 0.36 mA/cm2 of the Sn-Fe2O3. The gaps and bundles on the surface of the composite photoanodes make the surface rougher and improve their light absorption ability. Moreover, the cobalt imidazoles as passivation agents can effectively inhibit surface states from capturing charge carriers, reduce charge recombination and facilitate charge transfer, thus improving the PEC performance. Notably, it is found that the cobalt imidazole with a longer alkyl chain, e.g. Co-EIm, is more effective than the Co-MIm.

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Acknowledgements

This work was supported by the Scientific Research Fund of Hunan Provincial Education Department (21A0089) and the Natural Science Foundation of Hunan Province (2019JJ50595).

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  1. Hongli Han and Jinxin Chen have contributed equally to this work.

Authors and Affiliations

  1. School of Chemical Engineering, Xiangtan University, Xiangtan, 411105, People’s Republic of China

    Hongli Han, Jinxin Chen, Liping Wen & Jikai Liu

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  1. Hongli Han
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  2. Jinxin Chen
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Correspondence to Jikai Liu.

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Han, H., Chen, J., Wen, L. et al. Cobalt(II)-Imidazoles Passivated α-Fe2O3 Photoanode for Enhanced Photoelectrochemical Water Oxidation. Catal Lett 152, 3294–3303 (2022). https://doi.org/10.1007/s10562-021-03909-w

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  • DOI: https://doi.org/10.1007/s10562-021-03909-w

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