The Z-scheme heterojunction photocatalysts possess excellent photocatalytic activity benefitting from their properly matched edge potentials. In this work, ZnCo₂S₄ nanoparticles are anchored on Zn_0.2Cd_0.8S solid solution nanowires and assembled into binary ZnCo₂S₄/Zn_0.2Cd_0.8S nanocomposites. The as-synthesized ZnCo₂S₄/Zn_0.2Cd_0.8S nanocomposites act as bifunctional photocatalysts, which can be used for high-performance H₂ production coupling synthesis of high-value-added benzaldehyde in low concentration benzyl alcohol solution. Under visible light irradiation, 20%-ZnCo₂S₄/Zn_0.2Cd_0.8S nanocomposite shows the highest H₂ evolution rate of 23.02 mmol g⁻¹ h⁻¹ in the first photocatalytic cycle, which is 395.0 and 526.7 times higher than that of Zn_0.2Cd_0.8S and ZnCo₂S₄ under the same conditions. Eventually, after six-time cycles, the conversion rate and selectivity of benzyl alcohol oxidation to benzaldehyde are 54.3% and 92.2%, respectively. The enhancement of photocatalytic performance is mainly attributed to the Z-scheme heterojunction between ZnCo₂S₄ and Zn_0.2Cd_0.8S, which promote the separation and transfer of photogenerated charge carriers. This work provides strong support for the rational design of Z-scheme nano-heterojunction of highly efficient photocatalytic application in H₂ evolution and fine chemicals production.

Z型异质结光催化剂具有优异的光催化活性，这得益于其适当匹配的边缘电位。在这项工作中，ZnCo ₂ S ₄纳米粒子锚定在Zn _0.2 Cd _0.8 S 固溶体纳米线上并组装成二元ZnCo ₂ S ₄ /Zn _0.2 Cd _0.8 S 纳米复合材料。所合成的ZnCo ₂ S ₄ /Zn _0.2 Cd _0.8 S纳米复合材料作为双功能光催化剂，可用于高性能H ₂低浓度苯甲醇溶液生产耦合合成高附加值苯甲醛。在可见光照射下，20%-ZnCo ₂ S ₄ /Zn _0.2 Cd _0.8 S纳米复合材料在第一个光催化循环中的H ₂释放速率最高，为23.02 mmol g ^-1  h ^-1，分别为395.0倍和526.7倍。 Zn _0.2 Cd _0.8 S 和 ZnCo ₂ S ₄在相同的条件下。最终，经过6次循环后，苯甲醇氧化制苯甲醛的转化率和选择性分别为54.3%和92.2%。光催化性能的提高主要归功于ZnCo ₂ S ₄和Zn _0.2 Cd _0.8 S之间的Z型异质结，促进了光生载流子的分离和转移。该工作为Z型纳米异质结的合理设计在H ₂析出和精细化学品生产中的高效光催化应用提供了有力的支持。