Growth of Multiorientated Polycrystalline MoS2 Using Plasma-Enhanced Chemical Vapor Deposition for Efficient Hydrogen Evolution Reactions.

Na Liu,Jeonghun Kim,Bibhuti Bhusan Sahu,Sunkook Kim,Jeonghyeon Oh,Quang Trung Nguyen,Jeong Geon Han

doi:10.3390/nano10081465

Na Liu, Jeonghun Kim + Show 5 more

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https://doi.org/10.3390/nano10081465

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Journal: Nanomaterials	Publication Date: Jul 27, 2020
Citations: 9	License type: CC BY 4.0

Affiliation: Sungkyunkwan University, Nagoya University

Abstract

Molybdenum disulfide (MoS2) has attracted considerable attention as a promising electrocatalyst for the hydrogen evolution reaction (HER). However, the catalytic HER performance of MoS2 is significantly limited by the few active sites and low electrical conductivity. In this study, the growth of multiorientated polycrystalline MoS2 using plasma-enhanced chemical vapor deposition (PECVD) for the HER is achieved. The MoS2 is synthesized by sulfurizing a sputtered pillar-shaped Mo film. The relatively low growth temperature during the PECVD process results in multiorientated MoS2 with an expanded interlayer spacing of ~0.75 nm, which provides abundant active sites, a reduced Gibbs free energy of H adsorption, and enhanced intralayer conductivity. In HER applications, the PECVD-grown MoS2 exhibits an overpotential value of 0.45 V, a Tafel slope of 76 mV dec−1, and excellent stability in strong acidic media for 10 h. The high HER performance achieved in this study indicates that two-dimensional MoS2 has potential as an electrocatalyst for next-generation energy technologies.

Highlights

Rapid industrial growth has led to accelerating energy consumption and increased contamination of the environment
The MoS2 was synthesized on a Si substrate via a two-step growth process
H2S gas accompanied by Ar was injected into atinth3jee0cc0thi◦oaCmn,btihsereshacsohwaamnnSbineprrFweigcauusrrhseoe1rac.t.eTdhefrtohmer3m0a0ltpor5o0fi0le◦,Cinicnlu20dimngint.hTehtiemteems opfepralatusrmeawoapsemraatiinotnaianneddHfo2rS 1 h, and the chamber was cooled slowly under Ar gas with a flow rate of 60 sccm

Summary

Introduction

Rapid industrial growth has led to accelerating energy consumption and increased contamination of the environment. Developing clean sources of energy is necessary for reducing the amounts of pollutants and greenhouse gases released by the consumption of fossil fuels, such as coal [1]. H, which has the highest energy density of all chemical fuels, is a promising ecofriendly energy source [3]. The production of H via the steam-reforming method used in industry causes environmental pollution owing to the generation of CO2 at high temperatures, similar to the use of fossil fuels [4]. The hydrogen evolution reaction (HER) is a sustainable and efficient approach to generate H from water [5]

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Results

Conclusion