Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (03): 553-558.doi: 10.3866/PKU.WHXB201301101

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Electrooxidation Reaction of 3-Bromobenzoic Acid on Pt Electrode

YE Yong-Wei, WANG Xi, ZHENG Wan-Fang, LI Mei-Chao, MA Chun-An   

  1. Research Center of Analysis and Measurement, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China
  • Received:2012-10-30 Revised:2013-01-10 Published:2013-02-25
  • Supported by:

    The project was supported by the State Key Development Program for Basic Research of China (973) (2012CB722604) and National Natural Science Foundation of China (21206147).

Abstract:

Electrochemical oxidation of 3-bromobenzoic acid (3-BBA) on a Pt electrode in alkali solution was studied by cyclic voltammetry and in situ Fourier transform infrared (FTIR) spectroscopy. The Pt electrode exhibited good performance for the electrooxidation of 3-BBA. At low oxidation potential (1000 mV), one electron was removed from the 3-BBA radical anion and the corresponding free radical was generated. A Bbromobenzene free radical cation and carbon dioxide were obtained after decarboxylation. The bromobenzene cation was then attacked by the hydroxyl radical, which was adsorbed on the anode, and the bromobenzene cation intermediate product was debrominated to form phenol. When the potential shifted to more positive values, phenol was electrooxided to produce dihydroxybenzene and benzoquinone. Maleic acid and fumaric acid were also detected as the reaction products of the ring-opening reaction.

Key words: 3-Bromobenzoic acid, In situ Fourier transform infrared spectroscopy, Electrooxidation, Decarboxylation reaction, Debromination reaction

MSC2000: 

  • O646