Abstract
Introducing the surface plasmon resonance (SPR) effect in photoelectrochemical (PEC) is a common method to enhance the PEC performance. In this study, bimetallic (CuSb) NPs were used to co-modify BiVO4 based on the use of a single cheap metal Cu nanoparticles (NPs). At 1.23V vs RHE, the experimental results show that the photocurrent densities of Cu/BiVO4 and CuSb/BiVO4 are 2.25 and 5.46 times that of pure BiVO4, respectively. The reasons for improving performance can be summarized as follows: Cu NPs can introduce the surface plasmon resonance (SPR) effect to expand the absorption range of visible light and increase the concentration of charge carriers. The introduction of Sb NPs further broadens the photoresponse range and stability of BiVO4, enabling the photoanodes to generate more carriers to participate in the reaction. The synergistic effect of bimetal enables the photogenerated electrons to reach the surface of the Pt electrode faster for a reduction reaction. In summary, modifying BiVO4 with bimetallic CuSb NPs can increase the response range of light, increase the concentration of photogenerated electrons, and effectively suppress carrier recombination. Therefore, using bimetallic NPs modified photoanodes can be an effective means to improve the performance of PEC.
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