Manifestation of Concealed Defects in MoS2 Nanospheres for Efficient and Durable Electrocatalytic Hydrogen Evolution Reaction
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
Manifestation of Concealed Defects in MoS2 Nanospheres
for Efficient and Durable Electrocatalytic Hydrogen
Evolution Reaction
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| Creator |
Senthilkumar, SM.
Selvakumar, K. Karthikeyan, J. Thangamuthu, R. Murugan, P. Rajput, P. Jha, S.N. Bhattacharyya, D. Navascues, N. Irusta, S. |
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| Subject |
Functional Materials
Theoretical Electrochemistry |
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| Description |
MoS2 nanospheres were formed using a template free hydrothermal
process, which exhibit high catalytic activity towards
hydrogen evolution reaction (HER). The extend of defect sites
are probed by extended X-ray absorption fine structure which
found decrease in co-ordination number at Mo site rather than
at S site. DFT calculations identified an uneven strain and defect
distribution between two S planes of curved MoS2. Based on
hydrogen adsorption on various sites, we identify a new
pathway called “extended activity @ shielded defects”, for
Volmer-Tafel and Volmer-Heyrovsky mechanisms, where H
adsorption occurs at exposed S layer driven by defects in
underneath S layer of nanosphere. Having higher defect
concentration it exhibited excellent HER activity with overpotential
of �0.12 V, Tafel slope of 90 mV/decade, and higher
turnover frequency. Our findings provide an avenue to design
and engineer advanced nanostructures for catalysis, electronic
devices, and other potential applications.
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| Publisher |
Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/3203/1/2017-001-ChemistrySelect%202017%2C%202%2C%204667%E2%80%93%204672.pdf
Senthilkumar, SM. and Selvakumar, K. and Karthikeyan, J. and Thangamuthu, R. and Murugan, P. and Rajput, P. and Jha, S.N. and Bhattacharyya, D. and Navascues, N. and Irusta, S. Manifestation of Concealed Defects in MoS2 Nanospheres for Efficient and Durable Electrocatalytic Hydrogen Evolution Reaction. ChemistrySelect. ISSN 2365-6549 |
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| Relation |
http://cecri.csircentral.net/3203/
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