Abstract
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 product of electrode reaction of peak Ⅰ, to PO 3- 4. The rate limiting step in the electrode process from (HPO 2) ads to HPO 2- 3 is the desorption of (HPO 2) ads , and the desorption rate constant is estimated as 2.32±0.20 s -1 . A new schematic of oxidation process of hypophosphite is proposed.
Keywords
Hypophosphite, Oxidation, Cyclic voltammetry References
Publication Date
1999-02-28
Online Available Date
1999-02-28
Revised Date
1999-02-28
Received Date
1999-02-28
Recommended Citation
Dongbai Sun, Ying Jin, Hongying Yu, Dejun Yang.
Oxidation Mechanism of Hypophosphite[J]. Journal of Electrochemistry,
1999
,
5(1): Article 8.
DOI: 10.61558/2993-074X.3154
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol5/iss1/8
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