School of Chemical & Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459 (Singapore);; School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710119 (China).
ChemSusChem. 2015 Apr 24;8(8):1464-71. doi: 10.1002/cssc.201500067. Epub 2015 Mar 31.
Polyvinylpyrrolidone (PVP)-modified MoS3 nanoparticles with unusual water solubility up to 1.0 mg mL(-1) were synthesized through a facile hydrothermal method in the presence of thioacetic acid. The amorphous nanoparticles wrapped by PVP have sizes of around 2.5 nm, which represent the smallest MoS3 clusters reported. The photocatalytic performance of the MoS3 nanoparticles was evaluated under visible light for H2 evolution using xanthene dyes as photosensitizers. The quantum efficiency of the optimized system for H2 evolution under green light irradiation (520 nm) is up to 36.2 %, which is comparable with those of other excellent photocatalytic systems involving earth-abundant catalysts. The excellent photocatalytic activity can be attributed to its good dispersion in water, amorphous nature and limited layers with abundant surface active sites, and possibly higher conduction band potential for proton reduction and larger indirect band gap for a longer lifetime of the excited electrons.
通过在硫代乙酸存在下的简便水热法合成了具有不寻常水溶性（高达 1.0mg/mL）的聚维酮（PVP）修饰的 MoS3 纳米粒子。由 PVP 包裹的无定形纳米粒子的尺寸约为 2.5nm，这代表了报道的最小的 MoS3 团簇。使用呫吨染料作为光敏剂，在可见光下评估了 MoS3 纳米粒子的光催化性能，用于 H2 的产生。在绿光（520nm）辐照下优化的 H2 产生系统的量子效率高达 36.2%，与其他涉及丰富催化剂的优秀光催化系统相当。优异的光催化活性可归因于其在水中的良好分散性、非晶态性质和有限的层状结构，具有丰富的表面活性位，以及可能更高的导带电位有利于质子还原和更长的激发电子寿命。
