Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing, 210098, China.
Dalton Trans. 2019 Oct 7;48(39):14783-14791. doi: 10.1039/c9dt02849h.
Considerable efforts have been directed towards constructing high-efficiency, earth-abundant and low-cost photocatalysts for hydrogen evolution under visible light irradiation. In this work, 2D ultrathin CoP-decorated bimetallic MnxCd1-xS photocatalysts were developed based on the combined strategies of controllable band structure and co-catalyst modification. An optimal H2 production rate of 65 324 μmol g-1 h-1 was obtained for the Mn0.5Cd0.5S/CoP-4% sample under visible light irradiation, which was 4.26 times higher than that of pure Mn0.5Cd0.5S as well as 38.7 times that of pure CdS. UV-vis and MS characterization results showed that the introduction of Mn into CdS could change the band potential towards a more negative direction, which would be beneficial for water reduction. Moreover, the added CoP could act as a co-catalyst to facilitate the electron transfer and restrain the recombination of photogenerated electron-hole pairs, which was testified by photocurrent, PL and EIS analyses. This work paves the way to offer a new direction towards designing efficient photocatalysts for hydrogen evolution.
人们已经做出了相当大的努力来构建高效、丰富的地球资源和低成本的光催化剂，以在可见光照射下进行氢气的演化。在这项工作中，基于可控能带结构和共催化剂修饰的联合策略，开发了二维超薄 CoP 修饰的双金属 MnxCd1-xS 光催化剂。在可见光照射下，Mn0.5Cd0.5S/CoP-4% 样品的最佳 H2 产率为 65324 μmol g-1 h-1，是纯 Mn0.5Cd0.5S 的 4.26 倍，也是纯 CdS 的 38.7 倍。UV-vis 和 MS 表征结果表明，Mn 引入 CdS 可以将能带电位向更负的方向移动，这有利于水的还原。此外，添加的 CoP 可以作为共催化剂，促进电子转移并抑制光生电子-空穴对的复合，这可以通过光电流、PL 和 EIS 分析来证明。这项工作为设计高效的光解水制氢催化剂提供了新的方向。
