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Development of Co/Co9S8 metallic nanowire anchored on N-doped CNTs through the pyrolysis of melamine for overall water splitting

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submitted on 2023-09-14, 10:49 and posted on 2023-09-18, 13:20 authored by Anchu Ashok, Anand Kumar, Janarthanan Ponraj, Said A Mansour

Herein, 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.

Other Information

Published in: Electrochimica Acta
License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: https://dx.doi.org/10.1016/j.electacta.2020.137642

Funding

Open Access funding provided by the Qatar National Library

History

Language

  • English

Publisher

Elsevier

Publication Year

  • 2021

License statement

This Item is licensed under the Creative Commons Attribution 4.0 International License

Institution affiliated with

  • Qatar University
  • College of Engineering - QU
  • Hamad Bin Khalifa University
  • Qatar Environment and Energy Research Institute - HBKU

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