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

Danyun Xu, Pengtao Xu, Yuanzhi Zhu, Wenchao Peng, Yang Li, Guoliang Zhang, Fengbao Zhang, Thomas E. Mallouk, Xiaobin Fan

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Monolayer WS2 has interesting properties as a direct bandgap semiconductor, photocatalyst, 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 ∼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 H2 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.

Original languageEnglish (US)
Pages (from-to)2810-2818
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number3
DOIs
StatePublished - Jan 24 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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