Effects of Ion Energy and Density on the Plasma Etching‐Induced Surface Area, Edge Electrical Field, and Multivacancies in MoSe2 Nanosheets for Enhancement of the Hydrogen Evolution Reaction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Qingdong Ruan
  • De-Liang Bao
  • Jie Shen
  • Cheng Cheng

Detail(s)

Original languageEnglish
Article number2001470
Number of pages9
Journal / PublicationSmall
Volume16
Issue number25
Online published28 May 2020
Publication statusPublished - 25 Jun 2020

Abstract

Plasma functionalization can increase the efficiency of MoSe2 in the hydrogen evolution reaction (HER) by providing multiple species but the interactions between the plasma and catalyst are not well understood. In this work, the effects of the ion energy and plasma density on the catalytic properties of MoSe2 nanosheets are studied. The through-holes resulting from plasma etching and multi-vacancies induced by plasma-induced damage enhance the HER efficiency as exemplified by a small overpotential of 148 mV at 10 mA cm–2 and Tafel slope of 51.6 mV dec–1 after the plasma treatment using a power of 20 W. The interactions between the plasma and catalyst during etching and vacancies generation are evaluated by plasma simulation. Finite element and first-principles density functional theory calculations are also conducted and the results are consistent with the experimental results, indicating that the improved HER catalytic activity stems from the enhanced electric field and more active sites on the catalyst, and reduced bandgap and adsorption energy arising from the etched through-holes and vacancies, respectively. The results convey new fundamental knowledge about the plasma effects and means to enhance the efficiency of catalysts in water splitting as well insights into the design of high-performance HER catalysts.

Research Area(s)

  • edge electric field, etched through-holes, hydrogen evolution reaction, multivacancies, plasma simulation, plasma-induced damage

Citation Format(s)

Effects of Ion Energy and Density on the Plasma Etching‐Induced Surface Area, Edge Electrical Field, and Multivacancies in MoSe2 Nanosheets for Enhancement of the Hydrogen Evolution Reaction. / Xiao, Dezhi; Ruan, Qingdong; Bao, De-Liang; Luo, Yang; Huang, Chao; Tang, Siying; Shen, Jie; Cheng, Cheng; Chu, Paul K.

In: Small, Vol. 16, No. 25, 2001470, 25.06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal