Zhao Jiahao, Ma Xiaohui, Ren Mengyao, Zhao Jianlin, Yuan Chunhua, Cui Jinlong, He Wenxiu
School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China.
School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China; Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources (Inner Mongolia University of Science and Technology), Ministry of Education, Baotou 014010, China.
J Colloid Interface Sci. 2025 Jul;689:137269. doi: 10.1016/j.jcis.2025.137269. Epub 2025 Mar 7.
The development of efficient and low-cost photocatalysts has always been sought in H production from water cracking. Herein, a series of MoB/MnCdS composites were developed for high-performance photocatalytic H production. MnCdS nanoparticles were deposited on bulk metalloid MoB via a hydrothermal method (as confirmed by morphology tests) to construct a Schottky heterojunction. In the composites, the Fermi levels of MnCdS and MoB were rearranged (as confirmed by ultraviolet photoelectron spectroscopy) and the electrons of MnCdS rapidly migrated to MoB (as confirmed by X-ray photoelectron spectroscopy). Ultimately, the formation of the Schottky heterojunction significantly improved interfacial carrier separation, leading to efficient H production. MoB, which exhibits a Pt-like electronic structure, provided active sites for H evolution in the heterojunction composites. Furthermore, compared with those of MnCdS, the visible-light absorption capacity and H evolution kinetics of the heterojunction composites were also vastly improved. After photocatalytic H production, the performance of all heterojunction composites markedly increased. The performance of the composite with 20 % MoB/MnCdS) was the highest (4146.92 μmol·g·h), which was 11.3 times that of MnCdS (367.56 μmol·g·h). The stability of the composites was further evaluated, and the 20MoB/MnCdS composite lost only 12.8 % of its activity, indicating its excellent photostability. The underlying mechanism of H production over the heterojunction composites was also investigated. This work provides an innovative approach for achieving high-efficiency H production in a sulfide solid solution modified by a metalloid MoB cocatalyst.
在通过水裂解制氢过程中，人们一直在寻求高效且低成本的光催化剂。在此，开发了一系列用于高性能光催化制氢的MoB/MnCdS复合材料。通过水热法将MnCdS纳米颗粒沉积在块状类金属MoB上（形态测试证实），以构建肖特基异质结。在复合材料中，MnCdS和MoB的费米能级发生了重排（紫外光电子能谱证实），并且MnCdS的电子迅速迁移到MoB上（X射线光电子能谱证实）。最终，肖特基异质结的形成显著改善了界面载流子分离，从而实现了高效的制氢。具有类铂电子结构的MoB为异质结复合材料中的析氢提供了活性位点。此外，与MnCdS相比，异质结复合材料的可见光吸收能力和析氢动力学也得到了极大提高。光催化制氢后，所有异质结复合材料的性能均显著提高。含20%MoB/MnCdS的复合材料性能最高（4146.92 μmol·g·h），是MnCdS（367.56 μmol·g·h）的11.3倍。进一步评估了复合材料的稳定性，20MoB/MnCdS复合材料仅损失了12.8%的活性，表明其具有优异的光稳定性。还研究了异质结复合材料上析氢的潜在机制。这项工作为在由类金属MoB助催化剂改性的硫化物固溶体中实现高效制氢提供了一种创新方法。
