and hydrogen evolution reaction (HER) were deposited on Ni foam from low cost and abundant micro-sized particles of Ni(OH)2 and graphite powders using modified vaccum spray technique. The deposited thin films exhibited a mixed morphology of nanosheets and nanoflakes. We investigated the effect of increasing Ni(OH)2 content on the electrocatalytic activity toward the OER and the HER in 1 M KOH. We found that the hybrid catalyst with low Ni(OH)2 content (20 wt.%) revealed a high OER electrocatalytic activity that delivers 50 mA·cm-2 at an overpotential of 330 mV with a low Tafel slope of 78 mV·dec-1. Meanwhile, catalysts with higher Ni(OH)2 content (80 wt.%) exhibited superior HER activity that delivered 20 mA·cm-2 at an overpotential of 154 mV and a low Tafel slope of 92 mV·dec-1. The long term stability for both working electrodes was verified up to 25 hours
Research Abstract
Research Department
Research Journal
Materials Chemistry and Physics
Research Member
Research Publisher
Elsevier
Research Rank
1
Research Vol
Volume 244, 1 April 2020
Research Website
https://doi.org/10.1016/j.matchemphys.2020.122675
Research Year
2020
Research Pages
122675