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Deactivation Of Nickel Oxide/Hydroxide To Electrooxidation Of H 2po - 2 Anions On Nickel Electrodes In Alkaline Solutions, Taixiang Jiang, Huihuang Wu
Deactivation Of Nickel Oxide/Hydroxide To Electrooxidation Of H 2po - 2 Anions On Nickel Electrodes In Alkaline Solutions, Taixiang Jiang, Huihuang Wu
Journal of Electrochemistry
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 …
Oxidation Mechanism Of Hypophosphite, Dongbai Sun, Ying Jin, Hongying Yu, Dejun Yang
Oxidation Mechanism Of Hypophosphite, Dongbai Sun, Ying Jin, Hongying Yu, Dejun Yang
Journal of Electrochemistry
There exist two oxidation current peaks on the anodic polarization curve between -0.7 V and 0 V(SCE) in Na_hypophosphite solution. Peak Ⅰ (-0.55 V, SCE) , which represents the oxidation process from H 2PO - 2 to H 2PO - 3, has been studied previously. Peak Ⅱ, which is located at the potential about -0.4 V(SCE), is investigated emphatically in this paper. The results show that, peak Ⅰ and Ⅱ are corresponding to two successive steps in oxidation process of H 2PO - 2, i.e. peak Ⅱ corresponds to the oxidation process of adsorped (HPO 2) ads , an intermediate …