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Bulk and surface modified polycrystalline CuWO4 films for photoelectrochemical water oxidation

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  • Lee, Jin Uk
  • Kim, Jeong Hun
  • Kang, Kyungwoong
  • Shin, Yun Seop
  • Kim, Jin Young
  • Kim, Jin Hyun
  • Lee, Jae Sung

Abstract

Polycrystalline CuWO4 film is an emerging photoanode material for photoelectrochemical (PEC) water splitting with a small bandgap to absorb visible light and excellent stability in a neutral electrolyte. However, its PEC performance is quite low mainly due to its poor charge transfer characteristics. To enhance the performance of the CuWO4 photoanode, two modification strategies are employed; SnO2 as an electron transfer layer to improve the bulk charge separation efficiency of CuWO4 and cobalt phosphate as a co-catalyst to augment the surface charge separation efficiency at the interface of CuWO4||electrolyte. The two modifications enhance the PEC activity two times to 0.13 mA/cm2 @ 1.23 VRHE for water oxidation and 0.24 mA/cm2 @ 1.23 VRHE for hole scavenger oxidation, and exhibit an excellent stability in a neutral electrolyte. Although the performance is still very low compared to well-developed metal oxide photoanodes, this work shows possibility of further improvement with further developments of synthesis method as well as applying other elaborate modification strategies.

Suggested Citation

  • Lee, Jin Uk & Kim, Jeong Hun & Kang, Kyungwoong & Shin, Yun Seop & Kim, Jin Young & Kim, Jin Hyun & Lee, Jae Sung, 2023. "Bulk and surface modified polycrystalline CuWO4 films for photoelectrochemical water oxidation," Renewable Energy, Elsevier, vol. 203(C), pages 779-787.
    • Handle: RePEc:eee:renene:v:203:y:2023:i:c:p:779-787
    DOI: 10.1016/j.renene.2022.12.129
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    References listed on IDEAS

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    1. Hyosung Choi & Cheng-Kang Mai & Hak-Beom Kim & Jaeki Jeong & Seyeong Song & Guillermo C. Bazan & Jin Young Kim & Alan J. Heeger, 2015. "Conjugated polyelectrolyte hole transport layer for inverted-type perovskite solar cells," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    2. Ji-Wook Jang & Chun Du & Yifan Ye & Yongjing Lin & Xiahui Yao & James Thorne & Erik Liu & Gregory McMahon & Junfa Zhu & Ali Javey & Jinghua Guo & Dunwei Wang, 2015. "Enabling unassisted solar water splitting by iron oxide and silicon," Nature Communications, Nature, vol. 6(1), pages 1-5, November.
    3. Jin Hyun Kim & Ji-Wook Jang & Yim Hyun Jo & Fatwa F. Abdi & Young Hye Lee & Roel van de Krol & Jae Sung Lee, 2016. "Hetero-type dual photoanodes for unbiased solar water splitting with extended light harvesting," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
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