Abstract
Submicron size Co, Ni and Co–Ni alloy powders have been synthesized by the polyol method using the corresponding metal malonates and Pd powder by reduction of PdO x in methanol. The kinetics of the hydrogen evolution reaction (HER) in 6 M KOH electrolyte have been studied on electrodes made from the pressed powders. The d.c. polarization measurements have resulted in a value close to 120 mV decade−1 for the Tafel slope, suggesting that the HER follows the Volmer–Heyrovsky mechanism. The values of exchange current density (i o) are in the range 1–10 mA cm−2 for electrodes fabricated in the study. The a.c. impedance spectra measured at several potentials in the HER region showed a single semicircle in the Nyquist plots. Exchange current density (i o) and energy transfer coefficient (α) have been calculated by employing a nonlinear least square-fitting program.
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Elumalai, P., Vasan, H., Munichandraiah, N. et al. Kinetics of hydrogen evolution on submicron size Co, Ni, Pd and Co–Ni alloy powder electrodes by d.c. polarization and a.c. impedance studies. Journal of Applied Electrochemistry 32, 1005–1010 (2002). https://doi.org/10.1023/A:1020935218149
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DOI: https://doi.org/10.1023/A:1020935218149