Charge transport regulation in Cu1.94S–ZnS–Co9S8 heterostructures via band alignment engineering for photocatalytic hydrogen evolution

IF 2.4 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2026-05-23 DOI:10.1039/D6CE00305B

Weihuang Lin, Ying Yang, Zhaozhe Chen, Si Xiao and Weijia Wang

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Abstract

A facile sequential cation exchange reaction approach to synthesise two types of ternary sulphide NHs with comparable bulk composition, crystal structure, particle size and interfacial quality, but inverted component sequences of Cu_1.94S–ZnS–Co₉S₈ (CZC) and Cu_1.94S–Co₉S₈–ZnS (CCZ) was reported. Femtosecond transient absorption spectroscopy revealed that the ZnS/Co₉S₈ interface enables efficient charge transfer (τ₃ = 46.49 ps) in CZC, whereas the same interface hinders efficient charge migration and leads to severe non-radiative recombination in CCZ. This difference in charge transport behaviour results in a higher hydrogen evolution rate for CZC. Furthermore, extending this strategy to larger-sized rod-shaped CZC NHs achieves a high hydrogen evolution rate of 1047.2 μmol g⁻¹ h⁻¹ with improved structural stability.

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光催化析氢Cu1.94S-ZnS-Co9S8异质结构中的电荷输运调控

采用简便顺序阳离子交换法合成了两种体积组成、晶体结构、粒径和界面质量相当的三元硫化物NHs，但Cu1.94S-ZnS-Co9S8 （CZC）和Cu1.94S-Co9S8-ZnS （CCZ）的组分顺序相反。飞秒瞬态吸收光谱结果表明，ZnS/Co9S8界面使CZC中有效的电荷转移（τ3 = 46.49 ps）成为可能，而相同的界面阻碍了电荷的有效迁移，导致CCZ中严重的非辐射复合。这种电荷输运行为的差异导致了CZC较高的析氢速率。此外，将该策略扩展到更大尺寸的杆状CZC NHs中，可以获得1047.2 μmol g−1 h−1的高析氢速率，并提高了结构稳定性。

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