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Citation: Pan Zhan-Chang, Chen Qi-Yuan, Huang Hui-Min. Studies of Mn(III)/Mn(II) on Platinum Electrode in Acetic Acid-Anhydride Solution[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB20011203 shu

Studies of Mn(III)/Mn(II) on Platinum Electrode in Acetic Acid-Anhydride Solution

1.
College of Chemistry and Chemical Engineering, Central South University, Changsha　410083；Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou　510090

Received Date: 4 April 2001
Available Online: 15 December 2001

The electrochemical behavior of Mn(III)/Mn(II) on platinum electrode in acetic acid-anhydride was investigated. The results show that the conditional electrode potential of Mn(III)/Mn(II) was 0.719 V(vs SCE) in the solution of 1.5 mol•L－1 KOAc＋HOAc-Ac2O(3:1 volume ratio) at 25 ℃. The results of potential sweep and RDE on platinum electrode show that the rate determing step of the electrode processes for Mn(II) anodic oxidation was a charge-transfer step. The anodic charge-transfer kinetic parameters were determined. The results show that the anodic charge-transfer coefficient is 0.347, the exchange current density i0 is 5.84×10－6 A•cm－2, the conditional charge-transfer rate constant ka is 1.35×10－8 m•s－1 at 25 ℃. The rate was found to be first order with respect to the concentration of both Mn(II) and OAc－.
- Mn(III)/Mn(II);Acetic acid;Conditional electrode potential;Anodic oxidation;Change-transfer kinetic parameters
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