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

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 center dot 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 center dot cm(-2) at 0.3 V vs. RHE, which is better than that of-0.39 mA center dot 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 similar to 0.12% under the same conditions. Additionally, when H2O2 was used as an electron scavenger, the photocurrent density was-3 mA center dot 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.