Edge-Enriched Ultrathin MoS2 Embedded Yolk-Shell TiO2 with Boosted Charge Transfer for Superior Photocatalytic H2 Evolution

被引：174

作者：

Wang, Wenchao ^{[1
,2
,3
]}

Zhu, Sai ^{[1
,2
]}

Cao, Yingnan ^{[1
,2
]}

Tao, Ying ^{[1
,2
]}

Li, Xin ^{[1
,2
]}

Pan, Donglai ^{[1
,2
]}

Phillips, David Lee ^{[3
]}

Zhang, Dieqing ^{[1
,2
]}

Chen, Ming ^{[4
]}

Li, Guisheng ^{[1
,2
]}

Li, Hexing ^{[1
,2
]}

机构：

[1] Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Educ Minist Key, Shanghai 200234, Peoples R China

[2] Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Int Joint Lab Resource Chem, Shanghai 200234, Peoples R China

[3] Univ Hong Kong, Dept Chem, Pokfulam Rd, Hong Kong, Peoples R China

[4] Yangzhou Univ, Sch Chem & Chem Engn, Yangzhou 225002, Jiangsu, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2019年 / 29卷 / 36期

基金：

中国国家自然科学基金;

关键词：

embedded; hydrogen evolution; molybdenum disulfide; time-resolved fluorescence kinetics; titanium dioxide; FEW-LAYER MOS2; HYDROGEN-PRODUCTION; ANATASE TIO2; BAND-GAP; EFFICIENT; NANOSHEETS; WATER; HETEROSTRUCTURE; ARCHITECTURES; CATALYST;

D O I：

10.1002/adfm.201901958

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Exploring TiO2-photocatalysts for sunlight conversion has high demand in artificial photosynthesis. In this work, edge-enriched ultrathin molybdenum disulfide (MoS2) flakes are uniformly embedded into the bulk of yolk-shell TiO2 as a cocatalyst to accelerate photogenerated-electron transfer from the bulk to the surface of TiO2. The as-formed MoS2/TiO2 (0.14 wt%) hybrids exhibit a high hydrogen evolution rate (HER) of 2443 mu mol g(-1) h(-1), about 1000% and 470% of that of pristine TiO2 (247 mu mol g(-1) h(-1)) and bulk MoS2 decorated TiO2 (513 mu mol g(-1) h(-1)). Such a greatly enhanced HER is attributed to the exposed catalytic edges of the ultrathin MoS2 flakes with a robust chemical linkage (Ti-S bond), providing rapid charge transfer channels between TiO2 and MoS2. The catalytic stability is promoted by the antiaggregation of the highly dispersed MoS2 flakes in the bulk of yolk-shell TiO2. The exponential fitted decay kinetics of time-resolved photoluminescence (ns-PL) spectra illustrates that embedding ultrathin MoS2 flakes in TiO2 effectively decreases the average lifetime of PL in the MoS2/TiO2 hybrids (tau(ave) = 4.55 ns), faster than that of pristine TiO2 (approximate to 7.17 ns) and the bulk MoS2/TiO2 (approximate to 6.13 ns), allowing a superior charge separation and charge trapping process for reducing water.

引用

页数：10

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