Simply prepared α-Ni(OH)2-based electrode for efficient electrocatalysis of EOR and OER

As one of the most efficient Ni phases towards ethanol oxidation reaction (EOR), alpha-Ni(OH)2 2 is aimed to be simply prepared. Various alpha-Ni(OH)2-rich 2-rich deposits are obtained chronoamperometrically from NiCl2 2 solution onto a pristine graphite surface at different potentials. After careful optimization, the optimum values deposition potential and time are found to be-0.9 V and 150 s, respectively. At longer deposition times, the predominant component of the deposits is the (3-Ni(OH)2 2 phase. The optimum electrode, Ni(OH)2/G(opt), 2 /G (opt) , exhibits remarkable EOR catalytic activity with an ethanol oxidation peak current of 325.35 mA/cm2. 2 . Moreover, Ni(OH)2/G(opt) 2 /G (opt) demonstrates noteworthy activity and durability for oxygen evolution reaction (OER) in 1 M NaOH. Whereas the overpotential at current density of 10 mA/cm2 2 (ft=0) t=0 ) is 0.37 V; however, after 24 h it slightly increases to (f t=24h ) 0.39 V. These values imply significant outcomes for our novel and straightforward preparation method for creating highly efficient electrocatalysts for both EOR and OER using time- and cost-effective materials.