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AuthorAshok, Anchu
AuthorKumar, Anand
AuthorYuda, Afdhal
AuthorAl Ashraf, Abdullah
Available date2022-09-15T07:07:57Z
Publication Date2022
Publication NameInternational Journal of Hydrogen Energy
ResourceScopus
URIhttp://dx.doi.org/10.1016/j.ijhydene.2021.07.026
URIhttp://hdl.handle.net/10576/34038
AbstractThe implementation of direct methanol fuel cells is seen as a reliable factor in the future energy mix. Efficient energy conversion from methanol requires an active and durable catalyst to drive the anodic methanol oxidation reaction (MOR) in direct methanol fuel cells. As an alternative to high cost noble metals, cobalt-based electrocatalysts are considered potential replacements that meet the high activity and long-term stability for MOR. Herein, we report the preparation of hierarchical Co9S8 nanowires trapped in N-doped carbon nanotubes (N,S-Co@CNT) derived from melamine showing high activity for MOR in alkaline medium. In order to identify the main active sites, we synthesized cobalt particles embedded in carbon structures in absence of a sulphur source (Co@CNT) and evaluated its performance for MOR. The material characterization shows that adding sulphur during pyrolysis enhances the surface area, pore size and lattice defect. In addition, the morphology changes from hemi-spherical particles to nanowires, that significantly improves the electrochemical properties. The current density of N,S-Co@CNT is exceptionally higher (5.5 times) and the onset potential of MOR is shifted to lower potential when compared to Co@CNT. The enhanced activity, durability and stability of N,S-Co@CNT is ascribed to the unique hierarchical structure and surface properties.
SponsorThis publication was made possible by the NPRP grant ( NPRP8-145-2-066 ) from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the author(s). The authors also appreciate the help from Gas Processing Center (GPC), Center of Advanced Materials (CAM) at Qatar University for XPS and XRD characterizations. The SEM analysis was accomplished at the Central Laboratories Unit (CLU) Qatar University. The authors would also like to thank QEERI Core Labs for the TEM characterization.
Languageen
PublisherElsevier Ltd
SubjectElectrocatalysts
Methanol oxidation reaction
Oxygen evolution reaction
TitleHighly efficient methanol oxidation reaction on durable Co9S8 @N, S-doped CNT catalyst for methanol fuel cell applications
TypeArticle
Pagination3346-3357
Issue Number5
Volume Number47
dc.accessType Abstract Only


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