Facile Synthesis of Molybdenum Diselenide Layers for High-Performance Hydrogen Evolution Electrocatalysts

Dhanasekaran Vikraman, Sajjad Hussain, Kamran Akbar, Kathalingam Adaikalam, Seung Hu Lee, Seung Hyun Chun, Jongwan Jung, Hyun Seok Kim, Hui Joon Park

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A cost-effective solution-based synthesis route to grow MoSe2 thin films with vertically aligned atomic layers, thereby maximally exposing the edge sites on the film surface as well as enhancing charge transport to the electrode, is demonstrated for hydrogen evolution reaction. The surface morphologies of thin films are investigated by scanning electron microscopy and atomic force microscopy, and transmission electron microscopy analyses confirm the formation of the vertically aligned layered structure of MoSe2 in those films, with supporting evidences obtained by Raman. Additionally, their optical and compositional properties are investigated by photoluminescence and X-ray photoelectron spectroscopy, and their electrical properties are evaluated using bottom-gate field-effect transistors. The resultant pristine MoSe2 thin film exhibited low overpotential of 88 mV (at 10 mA·cm-2) and a noticeably high exchange current density of 0.845 mA·cm-2 with excellent stability, which is superior to most of other reported MoS2 or MoSe2-based catalysts, even without any other strategies such as doping, phase transformation, and integration with other materials.

Original languageEnglish
Pages (from-to)5799-5807
Number of pages9
JournalACS Omega
Volume3
Issue number5
DOIs
StatePublished - 31 May 2018

Bibliographical note

Publisher Copyright:
Copyright © 2018 American Chemical Society.

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