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Interfacial Engineering of In2O3/In2S3 Heterojunction Photoanodes for Photoelectrochemical Water Oxidation

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Abstract

Photoelectrochemical (PEC) water splitting is one of the critical energy conversion techniques to prepare for future energy demands. Among the various trials to construct effective water splitting semiconductor photoelectrodes, In2O3/In2S3 heterostructures can be promising candidates for their advantageous properties in solar water oxidation. Herein, we synthesized In2O3 nanorods on FTO substrate through a direct glancing angle deposition method. Subsequently, the In2S3 layer was conformally coated on In2O3 nanorods through facile chemical bath deposition. As synthesized photoanodes of In2O3/In2S3 form type II junction, leading to considerable cathodic onset potential shift with the increased photocurrent density compared to pristine samples. To further enhance PEC properties, the interficial engineering strategies of the Co ion doping and the deposition of ultra-thin Al2O3 film were carried out. Co ion could facilitate the charge transfer in photoanodes through the increased surface area, and the 2 nm Al2O3 layer coated above the photoanode effectively worked as the passivation layer to stabilize the photoanodes in alkaline electrolytes environments. This work would contribute to developing efficient photoanodes through various nanoscale engineering strategies.

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Acknowledgements

This work was financially supported by Nuclear Energy R&D Program (2020M2D8A206983012). The Inter-University Semiconductor Research Center and Institute of Engineering Research at Seoul National University provided research facilities for this work.

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  1. Bo Reum Lee and Sungkyun Choi have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea

    Bo Reum Lee, Sungkyun Choi, Woo Seok Cheon, Jin Wook Yang, Mi Gyoung Lee, So Hyeon Park & Ho Won Jang

  2. Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea

    Ho Won Jang

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  1. Bo Reum Lee
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  2. Sungkyun Choi
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Lee, B.R., Choi, S., Cheon, W.S. et al. Interfacial Engineering of In2O3/In2S3 Heterojunction Photoanodes for Photoelectrochemical Water Oxidation. Electron. Mater. Lett. 18, 391–399 (2022). https://doi.org/10.1007/s13391-022-00346-8

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