光催化
材料科学
催化作用
二硫化钼
硫化物
光化学
多硫化物
试剂
纳米晶
可见光谱
化学工程
光催化分解水
纳米技术
分解水
冶金
光电子学
有机化学
物理化学
化学
电极
电解质
工程类
作者
Liangxu Lin,Naihua Miao,Juntong Huang,Shaowei Zhang,Yanqiu Zhu,David D. Horsell,Philippe Ghosez,Zhimei Sun,D. A. Allwood
出处
期刊:Nano Energy
[Elsevier]
日期:2017-08-01
卷期号:38: 544-552
被引量:70
标识
DOI:10.1016/j.nanoen.2017.06.008
摘要
Molybdenum disulfide (MoS2) has a theoretical catalytic activity comparable to Pt but in practice is a poor catalyst in bulk form due to the scarcity of metal edge sites and low electrical conductivity. Recent developments on MoS2 monolayers (MLs) are more encouraging in developing cheap and efficient catalysts, but the majority metal atoms are on the basal plane and catalytically inactive. The rapid recombination of the electron-hole pairs and electronic band structure of the most stable 2H-MoS2 MLs are also unsuitable for efficient photocatalysis, especially for solar-driven water splitting. Here, we show that reducing the lateral size and creating sulphur (S) vacancies of MoS2 MLs not only increases dramatically the density of catalytically active sites, but also adjusts the band structure to become highly suitable for solar-driven catalysis. In addition, this preparation efficiently avoids fast charge recombination associated with MoS2, improves light harvesting, and gives a newly formed metallic state to transfer electrons for photocatalytic reactions. By way of example, we have demonstrated remarkable photocatalytic degradation of methylene blue (MB) and methylene orange (MO) dyes using the S-depleted Mo-S nanocrystals (NCs, 2–25 nm). The NCs are also promising to efficiently generate hydrogen (H2) from water with sacrificial reagents and solar light irradiation. Our study shows how careful design and modification of materials can result in highly efficient photocatalysts, which give considerable opportunities of the transition metal dichalcogenides (TMDs) beyond just MoS2 to develop highly efficient and economic catalysts.
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