Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (08): 718-722.doi: 10.3866/PKU.WHXB20030809

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Kinetics and Mechanism of Hypophosphite Electrooxidation on a Nickel Electrode

Zeng Yue;Zheng Yang-Cun;Yi Jian-Long;Yu Shang-Ci;Yang Chun-Ming;Li Ze-Lin   

  1. Department of Chemistry, Hunan Normal University, Changsha 410006
  • Received:2003-01-22 Revised:2003-03-24 Published:2003-08-15
  • Contact: Zeng Yue E-mail:zengyue@cs.hn.cn

Abstract: Kinetics and mechanism of hypophosphite oxidation on a nickel electrode were studied by means of the electrochemical mass spectroscopy (EMS) and kinetic model analysis. In the kinetic model, the electrooxidation of hypophosphite undergoes an H abstraction of hypophosphite from the P-H bond to form the phosphorus-centered radical, PHO2-•,which subsequently is electrochemically reacted with water to form the final product, phosphite. The kinetic equations were derived, and the kinetic parameters were obtained from a comparison of experimental results and the kinetic equations. The process of hypophosphite electrooxidation on a nickel electrode could be well simulated by this model.

Key words: Kinetics, Mechanism, Hypophosphite, Electrooxidation, Nickel electrode