Citation: Yue ZENG, Min MO, Jian Long YI, Xin Jun TANG, Hui Xian WANG. The Deactivation of Nickel Hydroxide to Hypophosphite Electrooxidation on a Nickel Electrode[J]. Chinese Chemical Letters, ;2004, 15(12): 1483-1486. shu

The Deactivation of Nickel Hydroxide to Hypophosphite Electrooxidation on a Nickel Electrode

1.
College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081;
2.
College of Chemistry and Chemical Engineering, Tianjin University, Tianjin 300072;
3.
Department of Chemistry, Hunan Agriculture University, Changsha 410128

Received Date: 9 February 2004

Fund Project: The work was supported by the Natural Science Foundation of Hunan Province (No. 01JJY3017).

The deactivation of nickel hydroxide to the electrooxidation of hypophosphite on a nickel electrode was studied by means of in situ UV-Vis subtractive reflectance spectroscopy. The experimental results show that when the potential is lower than-1.0V (SCE), the surface on nickel electrode is free of nickel hydroxide, on which hypophosphite is active. When the potential moves positively to about-0.75V, two absorbency bands around 300 nm and 550 nm, which were ascribed to the formation of α-nickel hydroxide, were observed, nickel is oxidized to α-nickel hydroxide.Severe deactivation of the surface occurs when the nickel surface is covered with nickel hydroxide,which separates the hypophosphite ion from nickel substrate.
- Hypophosphite,
- electrooxidation,
- deactivation,
- nickel hydroxide,
- in situ UV-Vis spectroscopy
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