Cargando…

Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction

Molybdenum disulfide (MoS(2)) has long been used in catalysis and is a promising material for energy conversion devices. In order to utilize MoS(2) in electrocatalytic applications, it needs to be sufficiently conductive. Even though a metallic 1T phase of MoS(2) exists, its exfoliation process is e...

Descripción completa

Detalles Bibliográficos
Autores principales: Saha, Dipankar, Patel, Vinay, Selvaganapathy, Ponnambalam Ravi, Kruse, Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: RSC 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9419535/
https://www.ncbi.nlm.nih.gov/pubmed/36132959
http://dx.doi.org/10.1039/d1na00456e
_version_ 1784777198891171840
author Saha, Dipankar
Patel, Vinay
Selvaganapathy, Ponnambalam Ravi
Kruse, Peter
author_facet Saha, Dipankar
Patel, Vinay
Selvaganapathy, Ponnambalam Ravi
Kruse, Peter
author_sort Saha, Dipankar
collection PubMed
description Molybdenum disulfide (MoS(2)) has long been used in catalysis and is a promising material for energy conversion devices. In order to utilize MoS(2) in electrocatalytic applications, it needs to be sufficiently conductive. Even though a metallic 1T phase of MoS(2) exists, its exfoliation process is expensive and difficult to scale because it involves hazardous materials and procedures, limiting its practical applications. We have previously reported an efficient and environmentally friendly procedure to exfoliate conductive MoS(2)via sonication in very dilute aqueous hydrogen peroxide. Here, we report a new way of exfoliating heavily doped conductive MoS(2) by sonication in pure water at 60 °C without additives. Conductivity measurements, Raman spectroscopy and X-ray photoelectron spectroscopy demonstrate that controlling the sonication time and temperature lead to the generation of small quantities of hydrogen peroxide in the water that interact with MoS(2) to form a small amount of sub-stoichiometric MoO(3−y). This impurity acts as a dopant and is responsible for the increase in conductivity of the MoS(2) films without compromising their structural integrity. We also evaluate the performance of the doped MoS(2) films as electrocatalysts in the hydrogen evolution reaction. We elucidate the mechanistic origin of the catalytic properties of these materials which may be of future use to develop a family of electrocatalysts based on doped MoS(2).
format Online
Article
Text
id pubmed-9419535
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher RSC
record_format MEDLINE/PubMed
spelling pubmed-94195352022-09-20 Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction Saha, Dipankar Patel, Vinay Selvaganapathy, Ponnambalam Ravi Kruse, Peter Nanoscale Adv Chemistry Molybdenum disulfide (MoS(2)) has long been used in catalysis and is a promising material for energy conversion devices. In order to utilize MoS(2) in electrocatalytic applications, it needs to be sufficiently conductive. Even though a metallic 1T phase of MoS(2) exists, its exfoliation process is expensive and difficult to scale because it involves hazardous materials and procedures, limiting its practical applications. We have previously reported an efficient and environmentally friendly procedure to exfoliate conductive MoS(2)via sonication in very dilute aqueous hydrogen peroxide. Here, we report a new way of exfoliating heavily doped conductive MoS(2) by sonication in pure water at 60 °C without additives. Conductivity measurements, Raman spectroscopy and X-ray photoelectron spectroscopy demonstrate that controlling the sonication time and temperature lead to the generation of small quantities of hydrogen peroxide in the water that interact with MoS(2) to form a small amount of sub-stoichiometric MoO(3−y). This impurity acts as a dopant and is responsible for the increase in conductivity of the MoS(2) films without compromising their structural integrity. We also evaluate the performance of the doped MoS(2) films as electrocatalysts in the hydrogen evolution reaction. We elucidate the mechanistic origin of the catalytic properties of these materials which may be of future use to develop a family of electrocatalysts based on doped MoS(2). RSC 2021-10-29 /pmc/articles/PMC9419535/ /pubmed/36132959 http://dx.doi.org/10.1039/d1na00456e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Saha, Dipankar
Patel, Vinay
Selvaganapathy, Ponnambalam Ravi
Kruse, Peter
Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
title Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
title_full Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
title_fullStr Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
title_full_unstemmed Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
title_short Facile fabrication of conductive MoS(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
title_sort facile fabrication of conductive mos(2) thin films by sonication in hot water and evaluation of their electrocatalytic performance in the hydrogen evolution reaction
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9419535/
https://www.ncbi.nlm.nih.gov/pubmed/36132959
http://dx.doi.org/10.1039/d1na00456e
work_keys_str_mv AT sahadipankar facilefabricationofconductivemos2thinfilmsbysonicationinhotwaterandevaluationoftheirelectrocatalyticperformanceinthehydrogenevolutionreaction
AT patelvinay facilefabricationofconductivemos2thinfilmsbysonicationinhotwaterandevaluationoftheirelectrocatalyticperformanceinthehydrogenevolutionreaction
AT selvaganapathyponnambalamravi facilefabricationofconductivemos2thinfilmsbysonicationinhotwaterandevaluationoftheirelectrocatalyticperformanceinthehydrogenevolutionreaction
AT krusepeter facilefabricationofconductivemos2thinfilmsbysonicationinhotwaterandevaluationoftheirelectrocatalyticperformanceinthehydrogenevolutionreaction