On the synthesis of morphology-controlled transition metal dichalcogenides via chemical vapor deposition for electrochemical hydrogen generation

Research output: Contribution to journalArticle

Authors

  • Rahul Sharma
  • Krishna Rani Sahoo
  • Pankaj Kumar Rastogi
  • Tharangattu N. Narayanan

Colleges, School and Institutes

External organisations

  • Tata Institute of Fundamental Research; Hyderabad, Sy. No. 36/P, Serilingampally Mandal, Gopanapally Village Hyderabad 500 107 India

Abstract

Shape-engineered atomically thin transition metal dichalcogenide (TMD) crystals are highly intriguing systems with regard to both fundamental and applied science. Herein, a chemical vapor deposition-assisted generalized synthesis strategy for the triangular- and dendritic-shaped TMDs and their ternary alloys is proposed, and the TMD structures' potential for electrocatalytic hydrogen evolution reaction (HER) applications is demonstrated. The alloy formation is confirmed via micro-Raman and photoluminescence studies and further verified using transmission electron microscopy and X-ray photoelectron spectroscopy. The HER activities of MoS 2 and MoSe 2 triangles are compared with those of their dendritic structures, and an enormous improvement in terms of overpotential and current density is observed for the dendritic structures. A further enhancement of the HER activity is observed in MoS 2(1−x)Se 2x triangular and dendritic structures, with dendritic MoS 2(1−x)Se 2x providing the best activity. The demonstrated nonequilibrium growth technique opens new avenues for the synthesis of morphology-controlled, large area, complex, and atomically thin TMD structures, which can have unprecedented properties, such as the enormous catalytic activity, tunable luminescence, etc., as presented in this article.

Details

Original languageEnglish
Article number1900257
Pages (from-to)1-10
Number of pages10
JournalPhysica Status Solidi - Rapid Research Letters
Volume13
Issue number12
Early online date25 Jun 2019
Publication statusPublished - Dec 2019

Keywords

  • atomically thin alloys, chemical vapor deposition, dendritic structures, hydrogen evolution, transition metal dichalcogenides