High Yield Exfoliation of WS2 Crystals into 1-2 Layer Semiconducting Nanosheets and Efficient Photocatalytic Hydrogen Evolution from WS2/CdS Nanorod Composites

被引：109

作者：

Xu, Danyun ^{[1
]}

Xu, Pengtao ^{[2
,3
,4
,5
]}

Zhu, Yuanzhi ^{[1
]}

Peng, Wenchao ^{[1
]}

Li, Yang ^{[1
]}

Zhang, Guoliang ^{[1
]}

Zhang, Fengbao ^{[1
]}

Mallouk, Thomas E. ^{[2
,3
,4
,5
]}

Fan, Xiaobin ^{[1
]}

机构：

[1] Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn, State Key Lab Chem Engn, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Penn State Univ, Dept Chem, University Pk, PA 16802 USA

[3] Penn State Univ, Dept Biochem & Mol Biol, University Pk, PA 16802 USA

[4] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[5] Penn State Univ, Ctr Dimens & Layered Mat 2, University Pk, PA 16802 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 03期

基金：

美国国家科学基金会;

关键词：

liquid-phase exfoliation; 1-2 layer semiconducting WS2 nanosheets; preintercalation; cocatalyst; photocatalytic hydrogen evolution; TRANSITION-METAL DICHALCOGENIDES; LIQUID-PHASE EXFOLIATION; MOS2; NANOSHEETS; 2-DIMENSIONAL NANOSHEETS; CDS NANORODS; GRAPHENE; INTERCALATION; MONOLAYERS; MECHANISM; DISPERSIONS;

D O I：

10.1021/acsami.7b15614

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Monolayer WS2 has interesting properties as a direct bandgap semiconductor, photo catalyst, and electrocatalyst, but it is still a significant challenge to prepare this material in colloidal form by liquid phase exfoliation (LPE). Here, we report the preparation of 1-2 layer semiconducting WS2 nanosheets in a yield of 18-22 wt % by a modified LPE method that involves preintercalation with substoichometric quantities of n-butyllithium. The exfoliated WS2 nanosheeets are n-type, have a bandgap of similar to 1.78 eV, and act as a cocatalyst with CdS nanorods in photocatalytic hydrogen evolution using lactate as a sacrificial electron donor. Up to a 26-fold increase in H-2 evolution rate was observed with WS2/CdS hybrids compared with their pure CdS counterpart, and an absorbed photon quantum yield (AQE) of >60% was measured with the optimized photocatalyst.

引用

页码：2810 / 2818

页数：9

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