Abstract
The electrocatalytic properties of lanthanum phosphate-bonded composite nickel-ruthenium electrodes for the hydrogen and oxygen evolution reactions were studied in 1 M KOH at 25°C. Ruthenium was chemically deposited on nickel powder particles,prior to polymerization of Ni/Ru powder with lanthanum phosphate. X-ray diffraction (XRD), X-ray fluorescence (XRF), BET, differential thermal analysis (DTA), scanning electron microscopy (SEM), EDX and u.v./vis. spectrophotometry were used to investigate the composition, morphology and characteristics of the electrodes. The influence of the ruthenium content and polymerization temperature on the electrocatalytic activity for hydrogen and oxygen evolution were studied. The mechanism and kinetics of the hydrogen evolution reaction (HER) were investigated using both steady-state polarization and a.c. impedance techniques.
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