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AuthorAshok, Anchu
AuthorKumar, Anand
AuthorPonraj, Janarthanan
AuthorMansour, Said A.
Available date2022-09-15T07:07:58Z
Publication Date2021
Publication NameElectrochimica Acta
ResourceScopus
URIhttp://dx.doi.org/10.1016/j.electacta.2020.137642
URIhttp://hdl.handle.net/10576/34047
AbstractHerein, we report the successful synthesis of Co9S8 metal-sulfide nanowire trapped in multi walled carbon nanotube (MWCNT), which was subsequently found to be an effective catalyst for water splitting. Melamine pyrolysis together with a Co precursor results in MWCNTs, with the addition of sulfur during synthesis enhancing the surface area, pore size, and oxygen vacancy defects in the nanotubes. The hierarchical structure of Co/Co9S8/CNT products boosted the electron mobility and mass transport for both the oxygen evolution (OER) and hydrogen evolution reaction (HER) in alkaline medium. Doping the catalyst surface with Pyridinic-N atoms, Graphitic-N atoms and thioamide S-atoms dramatically improved the bifunctional electrocatalytic performance by lowering the overpotentials for OER and HER reactions. The Co/Co9S8/CNT generated a current density of 10 mAcm?2 water-splitting current by applying a cell voltage of only 1.5 V. Further, Co/Co9S8/CNT showed excellent stability. The mechanism of Co8S9 nanowire formation in the MWCNT was also investigated.
SponsorThis publication was made possible by 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 wish to gratefully acknowledge Centre of Advanced Materials (CAM) and Gas Processing Center (GPC) at Qatar University for XRD and XPS analysis respectively. The SEM analysis was accomplished in the Central Laboratories Unit, Qatar University. The authors would also like to acknowledge QEERI Core Labs for their support related to the TEM characterization. Open Access funding provided by the Qatar National Library. The raw data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. The processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. Anchu Ashok: Conceptualization, Methodology, Data curation, Formal analysis, Investigation, Validation, Writing - Original draft, Anand Kumar: Conceptualization, Supervision, Writing - Review & Editing, Project administration, Funding acquisition, Janarthanan Ponraj: Visualization, Investigation, Said A. Mansour: Visualization, Investigation
Languageen
PublisherElsevier Ltd
SubjectHydrogen evolution reaction (HER)
Melamine pyrolysis
MWCNT catalysts
Overall water splitting
Oxygen evolution reaction (OER)
TitleDevelopment of Co/Co9S8 metallic nanowire anchored on N-doped CNTs through the pyrolysis of melamine for overall water splitting
TypeArticle
Volume Number368
dc.accessType Open Access


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