Cobalt as a sacrificial metal to increase the photoelectrochemical stability of CuBi2O4 films for water splitting.
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2023
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Resumo
CuBi2O4 is an excellent photocathode candidate in water-splitting photoelectrochemical
cells. However, its poor photoelectrochemical stability caused by the reduction of Cu2þ to
Cu metal limits its use. Here, we show a strategy to decrease the reduction of Cu2þ to Cu
using cobalt as a sacrificial metal. Co-doped CuBi2O4 films were prepared by spray pyrolysis
using Co2þ salt as the precursor. Co2þ ions replace Cu2þ in the CuBi2O4 structure, and subsequent heat treatment at 500 C leads to partial oxidation of Co2þ to Co3þ. As the
reduction potential of Co3þ/Co2þ is higher than that of Cu2þ/Cu, Cu2þ reduction can be
minimized. Comparatively, about 72% of the photocurrent produced by the CuBi2O4 film is
lost in the first few minutes of illumination. In the Co-doped CuBi2O4 film, the photocurrent
drops by less than 7%. Thus, the Co-doping can increase the CuBi2O4 photostability and be
helpful for the fabrication of more stable photocathodes.
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Water splitting, Photocathode, Photocorrosion, Photoelectrochemical cell, Hydrogen
Citação
BRUZIQUESI, C. G. O. et al. Cobalt as a sacrificial metal to increase the photoelectrochemical stability of CuBi2O4 films for water splitting. International Journal of Hydrogen Energy, v. 48, n. 9, p. 3456-3465, jan. 2023. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0360319922049850>. Acesso em: 01 ago. 2023.