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Template‐free synthesis of one‐dimensional cobalt sulfide nanorod array as an attractive architecture for overall water splitting
Author(s) -
Patil Supriya A.,
Rabani Iqra,
Vikraman Dhanasekaran,
Bathula Chinna,
Shrestha Nabeen K.,
Kim Hyungsang,
Hussain Sajjad,
Im Hyunsik
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5973
Subject(s) - cobalt sulfide , electrocatalyst , overpotential , electrolyte , materials science , electrode , electrochemistry , cobalt , oxygen evolution , exchange current density , chemical engineering , water splitting , nanorod , bifunctional , current density , catalysis , nanotechnology , chemistry , tafel equation , metallurgy , biochemistry , physics , photocatalysis , quantum mechanics , engineering
Summary One‐dimensional (1D) nanoarrays are beneficial for electrochemical reactions, including water splitting, due to their directional electron transport through the array, large effective surface area, and porosity. Fabrication of such array without a template is, however, extremely challenging. Herein, an ion‐exchange approach is employed to fabricate a 1D cobalt sulfide nanorod array (1D‐CoS) from Co 3 O 4 on stainless steel. The 1D‐CoS electrode works as a bifunctional electrocatalyst, attaining the current density of 10 mA cm −2 for hydrogen evolution reaction and oxygen evolution reaction at a low overpotential of 159 and 280 mV, respectively in a 1 M KOH solution. A full electrolyzer with the same two 1D‐CoS electrodes assembly demonstrates a low cell voltage of 1.75 V at 10 mA cm −2 and this performance value is well maintained for 20 hours. The efficient catalytic performance can be due to the controlled CoS phase with a unique 1D nanoarchitecture, which allows facile electrolyte diffusion and charge transfer between electrode/electrolyte interface.