Abstract
Electrooxidation of hypophosphite anions on polycrystalline nickel in alkaline solutions has been investigated by cyclic voltammetry and open circuit potential measurements.The results are explained based on the mechanism that the first step of hypophosphite oxidation is the adsorption of hypophosphite ions on nickel,followed by the homolysis of its hydrogen bond with the formation of radicals.The oxidation of hypophosphite on nickel in alkaline medium occurs at lower potentials between ca.-0.8 V—-1.1 V(SCE)and phosphite ion is the only oxidation product.There is no indication of hypophosphite oxidation at higher potentials.Severe deactivation of the surface occurs when the nickel surface is covered with surface oxide/hydroxide films which separates the hypophosphite ion from nickel substrate.The results show that the rate of the anodic oxidation of hypophosphite depends strongly on the nature of the nickel substrate,operation temperature,hypophosphite concentration and sweep rate.
Keywords
Hypophosphite, Electrooxidation, Nickel electrode
Publication Date
1999-08-28
Online Available Date
1999-08-28
Revised Date
1999-08-28
Received Date
1999-08-28
Recommended Citation
Taixiang Jiang, Huihuang Wu.
Deactivation of Nickel Oxide/Hydroxide to Electrooxidation of H 2PO - 2 Anions on Nickel Electrodes in Alkaline Solutions[J]. Journal of Electrochemistry,
1999
,
5(3): Article 9.
DOI: 10.61558/2993-074X.3185
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol5/iss3/9
References
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