The determination of kinetics parameters of the hydrogen evolution on TiNi alloys by ac impedance
✍ Scribed by N.V. Krstajić; B.N. Grgur; N.S. Mladenović; M.V. Vojnović; M.M. Jaks̆ić
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 717 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0013-4686
No coin nor oath required. For personal study only.
✦ Synopsis
The kinetics and mechanism of hydrogen evolution at Ti-Ni alloys electrode has been studied by means of steady-state potentiostatic polarization and ac impedance spectrum measurements. Complex-plane spectrum plots are derived for the h.e.r. at one of the most inactive, typical hydridic, Ti-Ni, and one of the most active, typical electrocatalytic, Ti-Ni3, intermetallic alloy compounds at various potentials. The rate constants of the forward and backward reactions of the corresponding steps were estimated by a nonlinear fitting method. It has been found that the overall reaction proceeds through a coupled Volmer-Heyrovsky mechanism. The electrocatalytic activity decreases in the order TiNi* > TiNis > TiNi > TilNi > TiNi > Ti3Ni > TiNi 07.