Bulk and surface modified polycrystalline CuWO4 films for photoelectrochemical water oxidation

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

Renewable Energy, 2023, vol. 203, issue C, 779-787

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.

Keywords: Copper tungstate photoanodes; Photoelectrochemical water splitting; Electron transfer layer; Co-catalyst; Charge transport (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:203:y:2023:i:c:p:779-787

DOI: 10.1016/j.renene.2022.12.129

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