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Citation: JIANG Tai-Xiang, WU Hui-Huang. in-situ IR Spectroscopic Studies of Oxidation of Hypophosphite on Polycrystaline Platinum Electrode[J]. Chinese Journal of Applied Chemistry, ;2004, 21(1): 24-27. shu

in-situ IR Spectroscopic Studies of Oxidation of Hypophosphite on Polycrystaline Platinum Electrode

JIANG Tai-Xiang ,
WU Hui-Huang ^,

1.
State Key Laboratory for Physical Chemistry of the Solid Surfaces, College of Chemistry & Chemical Engineering, Xiamen University, Xiamen 361005

Corresponding author: WU Hui-Huang,
Received Date: 30 March 2003
Available Online: 10 September 2003
Fund Project: 国家自然科学基金资助课题(20073035) (20073035)

The electrochemical oxidation of hypophosphite ions on polycrystaline Pt electrode in both acid and alkaline solutions has been studied by SNIFTIRS(Subtractively Normalized Interfacial FTIR Spectroscopy) and cyclic voltammetry, and compared with that on Ni electrode. From the in-situ IR spectra as a function of the electrode potentials, it was concluded that there is H₂PO₂(ad) on Pt as the adsorbed species besides adsorbed hydrogen. The product variety of hypophosphite oxidation on Pt depends on the electrode potentials and the pH values of solutions. At less positive potentials the product is H₂PO₃^- in acidic solution or HPO₃^- in alkaline solution, and at more positive potentials the product is H₃PO₄ in acidic solution or PO₄^3- in alkaline solution. The mechanism of hypophosphite oxidation on platinum electrode was discussed.
- hypophosphite,
- electrooxidation,
- electrocatalysis,
- SNIFTIRS
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