Electrochemical Characterization of Nickel in Oxalic Acid Solutions and the Effect of Halides and Azide Ions Additions on Its Behavior
Noura S. Tantawy;
Abstract
The electrochemical behavior of polycrystalline nickel in aqueous oxalic acid solutions was thoroughly investigated using different electrochemical techniques. Open circuit potential (OCP) transients of Ni electrode indicate different natural tendencies for the metal to modify its pre-immersion native film in oxalic acid medium depending on its concentration and temperature. In agreement with the OCP results, electrochemical impedance spectroscopy (EIS) clearly demonstrates that surface film resistance (Rf) on Ni increases with concentration over the range 0.01-0.5 M, but decreases with raising temperature. Also, linear sweep voltammetry (LSV) was used to compare at similar experimental conditions hydrogen evolution reaction (HER) on nickel cathode to that on platinum which has high catalytic activity towards HER.
Other data
| Title | Electrochemical Characterization of Nickel in Oxalic Acid Solutions and the Effect of Halides and Azide Ions Additions on Its Behavior | Authors | Noura S. Tantawy | Keywords | Nickel metal; Oxalic acid; Halides; Azide ions; EIS; LSV; SEM | Issue Date | 2017 | Journal | Int. J. Electrochem. Sci., |
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| Paper 2017 (2).pdf | 1.16 MB | Adobe PDF | Request a copy |
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