Naslov
Hydrogen Evolution Reaction on Ni-alloys Stabilized by H-adsorption

Autori
Jukić, Ante ; Metikoš-Huković, Mirjana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
ECS Meeting Abstracts, Session W1: Molecular functions of electroactive thin films, Physical electrochemistry division, Vol. MA 98-2 / Oyama, N. ; Birss V.I. - Pennington (NJ) : The Electrochemical Society (ECS), 1998

Skup
194th Meeting of the Electrochemical Society

Mjesto i datum
Boston (MA), Sjedinjene Američke Države, 01.11.1998. - 06.11.1998

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Ni-alloys; amorphous catalyst; electrocatalytic activity; hydrogen evolution reaction; hydrides

Sažetak
In this paper, we report the results regarding the h.e.r. on various Ni-Zr amorphous alloy catalysts, in order to characterize their electrocatalytic activity, efficiency and stability. Amorphous Ni-Zr alloys were prepared by the melt-spinning method. All experiments were carried out at 21 °C in 1 M NaOH aqueous solution, using steady state potentiostatic polarization, cyclic voltammetry and ac impedance spectroscopy techniques. Analysis and discussion of the results was based on a theoretical transfer function derived for the Volmer-Heyrovsky mechanism. The formal rate constant values for each step were determined by a non-linear regression of steady-state polarization curves and were composed with results of the impedance data obtained from a nonlinear least squares fit. Anomalous Tafel slopes, higher than 120 mV/dec, were ascribed to the presence of a metal-hydride film which caused an additional potential drop at the electrode/electrolyte interface. The Ni-40Zr alloy had the best electrocatalytic properties for the h.e.r. The good performance of this catalyst was attributed to the optimum combination of a high conducting bond electronic density of states and the hydride properties. The kinetic parameters obtained for Zr-Ni alloys were compared to those obtained on polycrystalline nickel and zirconium.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA