Influence of graphitic/amorphous coated carbon on HER activity of low temperature synthesized β-Mo2C@C nanocomposites

Graphical representation of HER activity in presence of β-Mo2C@C. [Display omitted] •Carbon coated β-Mo2C has been synthesized at relatively low temperature 600 °C.•The nature of adherent surface carbon on β-Mo2C influences electrocatalytic activity.•Graphictic/amorphous carbon influence the charge...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2018-09, Vol.348, p.1037-1048
Main Authors: Mir, Rameez Ahmad, Pandey, Om Prakash
Format: Article
Language:English
Subjects:
Carbon coating
Carburization
Electrocatalyst
Hydrogen evolution reaction
Molybdenum carbide
Nano-composite
Waste plastics
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Summary:Graphical representation of HER activity in presence of β-Mo2C@C. [Display omitted] •Carbon coated β-Mo2C has been synthesized at relatively low temperature 600 °C.•The nature of adherent surface carbon on β-Mo2C influences electrocatalytic activity.•Graphictic/amorphous carbon influence the charge transfer kinetics and stability.•EDLC results suggest β-Mo2C suitable candidate for energy storage devices. The most economical and sustainable method for commercial scale production of hydrogen is through electrochemical water splitting. Though noble metal free catalysts for hydrogen evolution reaction (HER) are being developed to make water splitting more efficient, the search of highly efficient cost effective catalyst for HER still remains a challenge. Carbon coated molybdenum carbide composites (β-Mo2C@C), a noble metal free electrocatalyst is being highly studied substance as potential electrocatalyst for water splitting where presence of graphitic carbon plays important role. Our study indicate that nature of carbon coating on Mo2C surface plays vital role (amorphous/graphitic). In our systematic experiments β-Mo2C@C was synthesized in an autoclave. The synthesis parameters were varied to get amorphous as well as graphitic coating on Mo2C. The amorphous surface carbon shows better stability of electrocatalyst in acidic medium compared to graphitic coating. The electrochemical double-layer capacitance (EDLC) measurements suggest β-Mo2C@C as suitable candidate for energy storage applications.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2018.05.041