Citation: Wencheng Fang, Dong Liu, Ying Zhang, Hao Feng, Qiang Li. Improved Photoelectrochemical Performance by Polyoxometalate- Modified CuBi₂O₄/Mg-CuBi₂O₄ Homojunction Photocathode[J]. Acta Physico-Chimica Sinica, ;2024, 40(2): 230400. doi: 10.3866/PKU.WHXB202304006 shu

Improved Photoelectrochemical Performance by Polyoxometalate- Modified CuBi₂O₄/Mg-CuBi₂O₄ Homojunction Photocathode

MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Corresponding author: Hao Feng, Qiang Li,
Received Date: 3 April 2023
Revised Date: 19 May 2023
Accepted Date: 22 May 2023

Fund Project: This work was supported by the National Key Research and Development Program of China (2021YFF0500700), National Natural Science Foundation of China (51976090, 52006101, 52006103), Scientific and Technological Innovation Project of Carbon Emission Peak and Carbon Neutrality of Jiangsu Province, China (BE2022024), and Natural Science Foundation of Jiangsu Province, China (BK20200491).

Photoelectrochemical water splitting using semiconductor materials is one of the most promising methods for converting solar energy into chemical energy. Among the commonly used semiconductors, p-type CuBi₂O₄ is considered one of the most suitable photocathode materials and can allow a theoretical photocurrent density of about 20 mA·cm^-2 for photoelectrochemical water splitting. However, due to severe charge carrier recombination, the obtained photocurrent density is much lower than the theoretical value. Highly efficient photoelectrochemical performance relies on fast charge carrier separation and transport, and prompt reaction kinetics. In this study, we report the development of a polyoxometalate-modified CuBi₂O₄/Mg-CuBi₂O₄ homojunction photocathode to improve both the bulk and interfacial charge carrier transport in the photocathode. For the bulk of the photocathode, the built-in electric field originating from the CuBi₂O₄/Mg-CuBi₂O₄ homojunction promotes the migration of photo-excited electrons on the conduction band from pure CuBi₂O₄ to Mg-doped CuBi₂O₄. Additionally, the electric field facilitates the transfer of holes from the valence band of Mg-doped CuBi₂O₄ to pure CuBi₂O₄. This directional transfer of both photo-excited electrons and holes plays a significant role in promoting separation and suppressing the recombination of the charge carriers. On the surface of the photocathode, the reduced polyoxometalate co-catalyst Ag₆[P₂W₁₈O₆₂] (AgP₂W₁₈) was used as a proton sponge to accelerate surface reaction kinetics and suppress carrier recombination. These synergistic effects improved the photo-generated charge carrier transfer and reaction kinetics. As a result, the novel photocathode displayed excellent photoelectrochemical properties, and the photocurrent density was observed to be -0.64 mA·cm^-2 at 0.3 V vs. RHE, which is better than that of -0.39 mA·cm^-2 for a pure photocathode. Furthermore, the novel photocathode had an applied bias photon-to-current efficiency (ABPE) higher than 0.19% at 0.3 V vs. RHE. In contrast, the pure photocathode had an ABPE of ~0.12% under the same conditions. Additionally, when H₂O₂ was used as an electron scavenger, the photocurrent density was -3 mA·cm^-2 at 0.3 V vs. RHE, which is an improvement of approximately 1.5 times compared to the pure photocathode. Furthermore, the charge separation and charge injection efficiency of the novel photocathode were significantly improved compared with the pure photocathode. The experimental results conclusively indicate that the formation of the CuBi₂O₄/Mg-CuBi₂O₄ homojunction and AgP₂W₁₈ modification played a significant role in the improved performance of the CuBi₂O₄ photocathode. The performance of the novel photocathode was comparable with the results reported in previous studies, demonstrating its promising potential in real applications.
- CuBi₂O₄,
- Mg-doping,
- Photocathode,
- Polyoxometalate co-catalyst,
- Photoelectrochemistry
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Improved Photoelectrochemical Performance by Polyoxometalate- Modified CuBi2O4/Mg-CuBi2O4 Homojunction Photocathode

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通讯作者: 陈斌, bchen63@163.com

Improved Photoelectrochemical Performance by Polyoxometalate- Modified CuBi₂O₄/Mg-CuBi₂O₄ Homojunction Photocathode