Department of Chemistry, Fujian Province University Key Laboratory of Green Energy and Environment Catalysis, Ningde Normal University, Ningde 352100, PR China.
Dalton Trans. 2023 Jun 13;52(23):7869-7875. doi: 10.1039/d3dt00711a.
Developing novel photocatalysts with an intimate interface and sufficient contact is significant for the separation and migration of photogenerated carriers. In this work, a novel Co@NC/ZnInS heterojunction with a strong Co-S chemical bond was formed at the interface between Co@NC and ZnInS, which accelerated charge separation. Meanwhile, the recombination of the electron-hole pairs was further restricted by the Co@NC/ZnInS Schottky junction. The Co@NC (5 wt%)/ZnInS composite exhibited an H evolution rate of 33.3 μmol h, which is 6.1 times higher than that of the pristine ZnInS, and Co@NC/ZnInS showed excellent stability in the photocatalytic water splitting reaction. Its apparent quantum yield reached 38% at 420 nm. Furthermore, the Kelvin probe test results showed that the interfacial electric field formed as the driving force for interface charge transfer was oriented from Co@NC to ZnInS. In addition, the Co-S bond as a high-speed channel facilitated the interfacial electron transfer. This work reveals that formed chemical bonds will pave the way for designing high-efficiency heterojunction photocatalysts.
开发具有紧密界面和充分接触的新型光催化剂对于光生载流子的分离和迁移具有重要意义。在这项工作中，在 Co@NC 和 ZnInS 之间的界面形成了具有强 Co-S 化学键的新型 Co@NC/ZnInS 异质结，这加速了电荷分离。同时，Co@NC/ZnInS 肖特基结进一步限制了电子-空穴对的复合。Co@NC（5wt%）/ZnInS 复合材料的 H2 演化速率为 33.3 μmol h，是原始 ZnInS 的 6.1 倍，并且在光催化水分解反应中表现出优异的稳定性。其在 420nm 时的表观量子产率达到 38%。此外，开尔文探针测试结果表明，形成的界面电场作为界面电荷转移的驱动力从 Co@NC 指向 ZnInS。此外，Co-S 键作为高速通道促进了界面电子转移。这项工作表明，形成的化学键将为设计高效异质结光催化剂铺平道路。
