The Mechanism of Hydrogen Evolution Reaction on a Modified Raney Nickel Composite‐Coated Electrode by AC Impedance
| Autor: | Masazumi Okido, J. K. Depo, G. A. Capuano |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Electrolysis
Tafel equation Renewable Energy Sustainability and the Environment Chemistry Inorganic chemistry chemistry.chemical_element Overpotential Condensed Matter Physics Electrocatalyst Raney nickel Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Catalysis chemistry.chemical_compound Nickel law Electrode Materials Chemistry Electrochemistry |
| Zdroj: | Journal of The Electrochemical Society. 140:127-133 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.2056073 |
| Popis: | The hydrogen evolution reaction (HER) on a modified Raney nickel electrode, consisting of Ni‐Al‐Cu‐Cr alloy, was investigated with ac impedance measurements and by dc polarization current behavior in 5.36M solution at 70°C. Comparative measurements also were carried out on commercial Raney nickel (Ni‐Al). The rate constants of the forward and backward reactions of Volmer, Heyrovsky, and Tafel steps were estimated by a nonlinear fitting method. The modified Raney nickel composite‐coated electrode provides a lower overpotential for the HER than the commercial Raney nickel‐coated electrode. The main pathway for the HER is Volmer‐Tafel with Volmer as the rate determining step. |
| Databáze: | OpenAIRE |
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