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http://dx.doi.org/10.6111/JKCGCT.2021.31.3.143

Heat-treatment effects on oxygen evolution reaction of nickel-cobalt layered double hydroxide  

Lee, Jung-Il (Department of Materials Science and Engineering, Korea National University of Transportation)
Ko, Daehyeon (Department of Advanced Materials Engineering, Kyonggi University)
Mhin, Sungwook (Department of Advanced Materials Engineering, Kyonggi University)
Ryu, Jeong Ho (Department of Materials Science and Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.31, no.3, 2021 , pp. 143-148 More about this Journal
Abstract
Alkaline oxygen evolution reaction (OER) electrocatalysts have been widely studied for improving the efficiency and green hydrogen production through electrochemical water splitting. Transition metal-based electrocatalysts have emerged as promising materials that can significantly reduce the hydrogen production costs. Among the available electrocatalysts, transition metal-based layered double hydroxides (LDHs) have demonstrated outstanding OER performance owing to the abundant active sites and favorable adsorption-desorption energies for OER intermediates. Currently, cobalt doped nickel LDHs (NiCo LDHs) are regarded as the benchmark electrocatalyst for alkaline OER, primarily owing to the physicochemical synergetic effects between Ni and Co. We report effects of heat-treatment of the as-grown NiCo LDH on electrocatalytic activities in a temperature range from 250 to 400℃. Electrocatalytic OER properties were analysed by linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). The heat-treatment temperature was found to play a crucial role in catalytic activity. The optimum heat-treatment temperature was discussed with respect to their OER performance.
Keywords
Elecrocatalysis; Water splitting; OER; NiCo LDH; Heat-treatment;
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