Abstract
Utilizing solar energy to power semiconductors for water splitting and hydrogen production is an effective method for clean energy generation. This study presents a new S-scheme heterojunction catalyst, constructed via electrostatic self-assembly of CuBr and Co3O4 quantum dots. The band gap-matching positions and energy band structures of CuBr and Co3O4 quantum dots are well-suited for this purpose. The hydrogen precipitation performance of the resulting CQCB2 catalyst is approximately four times higher than that of a single catalyst. Additionally, CQCB2 exhibits good stability, with an 80% hydrogen precipitation efficiency after four consecutive cycles. The study demonstrates that CQCB2 exhibits a high absorbance intensity, efficient charge separation, low electron transport resistance, and low photogenerated carrier recombination rate. This is further validated by XPS and UPS experiments, which support the S-scheme heterojunction charge transfer mechanism. Overall, this paper provides a unique insight into the study of S-scheme heterojunction catalysts.
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