Synthesis and enhanced electrochemical catalytic performance of monolayer WS2(1-x) Se2x with a tunable band gap

Qi Fu; Lei Yang; Wenhui Wang; Ali Han; Jian Huang; Pingwu Du; Zhiyong Fan; Jingyu Zhang; Bin Xiang

doi:10.1002/adma.201500368

Synthesis and enhanced electrochemical catalytic performance of monolayer WS2(1-x) Se2x with a tunable band gap

Adv Mater. 2015 Aug 26;27(32):4732-8. doi: 10.1002/adma.201500368. Epub 2015 Jul 8.

Authors

Qi Fu¹, Lei Yang¹, Wenhui Wang¹, Ali Han¹, Jian Huang¹, Pingwu Du¹, Zhiyong Fan², Jingyu Zhang³, Bin Xiang^{1

4}

Affiliations

¹ Department of Materials Science & Engineering, CAS Key Lab of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui, 230026, China.
² Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong SAR, 8523, China.
³ Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA, 94720, USA.
⁴ Synergetic Innovation Center of Quantum, Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.

PMID: 26153276
DOI: 10.1002/adma.201500368

Abstract

The first realization of a tunable band-gap in monolayer WS2(1-x) Se2x is demonstrated. The tuning of the bandgap exhibits a strong dependence of S and Se content, as proven by PL spectroscopy. Because of its remarkable electronic structure, monolayer WS2(1-x) Se2x exhibits novel electrochemical catalytic activity and offers long-term electrocatalytic stability for the hydrogen evolution reaction.

Keywords: WS2(1-x)Se2x; catalytic activity; hydrogen evolution reactions; photoluminescence; tunable band gap.