pH dependent kinetic insights of electrocatalytic arsenite oxidation reactions at Pt surface

Mohammad A. Hasnat*, Mohammad M. Hasan, Nahida Tanjila, Md Mahbubul Alam, Md Musfiqur Rahman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Kinetics of electrocatalytic oxidation of arsenite ions has been investigated at a Pt disk electrode using cyclic voltammetry, convolution potential sweep voltammetry and electrochemical impedance spectroscopy. A complimentary environment pertaining to oxidation reactions of arsenite ions is attained in the acidic medium compared to a neutral or basic medium. It is suggested that in the neutral and basic media, direct electron transfer from the solution to electrode instigate the oxidation process without any pre adsorption. Meanwhile, in the acidic medium, prior to oxidation, arsenite ions are adsorbed on the Pt surface and a stepwise reaction mechanism is involved. Using impedance analysis, it is suggested that different forms of surface oxides at various pH values control the oxidation kinetics.

Original languageEnglish
Pages (from-to)105-113
Number of pages9
JournalElectrochimica Acta
Volume225
DOIs
Publication statusPublished - 2017 Jan 20
Externally publishedYes

Keywords

  • CPSV
  • CV
  • Diffusion coefficient
  • mechanism
  • Rate constant

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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