Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 11, Pages 4100-4104Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.01.115
Keywords
2,5-Dibromobenzoic acid; Benzoic acid; Ag electrode; Electrochemical hydrodebromination; In situ FTIR
Categories
Funding
- National Natural Science Foundation of China [20876151]
- Zhejiang Provincial Natural Science Foundation of China [Y4100647]
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Cyclic voltammetry and in situ FUR were employed to study the electrochemical hydrodebromination (EHB) mechanism of 2,5-dibromobenzoic acid (2,5-DBBA) in NaOH solution. Compared with titanium and graphite electrodes, silver electrode exhibited a high electrocatalytic activity for the hydrodebromination reaction of 2,5-DBBA. On the basis of in situ FTIR data, EHB reaction of 2.5-DBBA on Ag cathode might be represented as a sequence of electron additions and bromine expulsions. Firstly, from potential at approximately -1100 mV, 2,5-DBBA received an electron to form 2,5-DBBA radical anion, which lost a bromine ion in the 2-position to form 3-bromobenzoic acid (3-BBA) free radical. Then the free radical received a proton to give 3-BBA. Finally, 3-BBA further took off another bromine ion to produce benzoic acid free radical and the end product benzoic acid was obtained by receiving another electron and a proton with the potential shifting to more negative values. (C) 2011 Elsevier Ltd. All rights reserved.
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