Fabrication of MoS 2 /WSe 2 heterostructures as electrocatalyst for enhanced hydrogen evolution reaction

Dhanasekaran Vikraman, Sajjad Hussain, Linh Truong, K. Karuppasamy, Hyun Jung Kim, T. Maiyalagan, Seung Hyun Chun, Jongwan Jung, Hyun Seok Kim

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

Two-dimensional material based heterostructures produce novel phenomena due to distinctive interactions between stacked layers. This paper details fabrication of van der Waals heterostructure consisting of layered MoS 2 and WSe 2 on FTO substrates by combining solution bath and radio-frequency sputtering. Raman scattering confirmed WSe 2 /MoS 2 heterostructure formation, X-ray photoelectron spectroscopy surface profile detailed the heterostructure composition, and depth profile showed heterostructure interfacial structure with stacked WSe 2 and MoS 2 layers on the FTO substrate. Surface properties confirmed the WSe 2 /MoS 2 heterostructure formed a multi-structured array of nanograins, and high resolution electron micrographs confirmed vertically formed layered fringes. Hydrogen evolution showed enhanced electrocatalytic behavior with 116 mV overpotential at 10 mA/cm 2 and 76 mV/decade Tafel slope. Electrocatalytic property robustness was confirmed by over 20 h continuous hydrogen evolution reaction in an acidic solution. Enhanced electrocatalytic outcomes were due to increased interfacial hole-electron separation, dispersing active facets through the interface. The stacked layered structure provides a new avenue for two-dimensional heterostructures for energy harvesting devices.

Original languageEnglish
Pages (from-to)611-620
Number of pages10
JournalApplied Surface Science
Volume480
DOIs
StatePublished - 30 Jun 2019

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Electrocatalyst
  • Heterostructures
  • Hydrogen evolution
  • MoS
  • TEM
  • WSe

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