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Electrochemical impedance spectroscopy of oxygen and hydrogen evolution on amorphous alloys in 1 M KOH
Author(s) -
Kessler Teresita,
Vilche Jorge R.,
Ebert Michael,
Jüttner Klaus,
Lorenz Wolfgang J.
Publication year - 1991
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270140408
Subject(s) - dielectric spectroscopy , amorphous solid , hydrogen , electrochemistry , oxygen , materials science , crystallite , analytical chemistry (journal) , amorphous metal , electrode , oxygen evolution , chemistry , metallurgy , crystallography , organic chemistry , chromatography
The mechanisms of oxygen and hydrogen evolution on amorphous alloys G 14 (Fe 60 Co 20 Si 10 B 10 ) and G 16 (Co 50 Ni 25 Si 15 B 10 ) in 1 M KOH at T = 298 K and 333 K were studied by electrochemical impedance spectroscopy (EIS). Comparative measurements were carried out on polycrystalline Pt electrodes. Impedance spectra in the frequency range 10 −3 Hz ≤ f ≤ 10 4 Hz were analyzed to determine the kinetic behaviour of amorphous alloys by application of transfer function analysis, using non‐linear fit routines. The EIS‐data are interpreted in terms of consecutive reaction mechanisms for both oxygen and hydrogen evolution.