Journal
ELECTROCHIMICA ACTA
Volume 52, Issue 13, Pages 4547-4553Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.12.059
Keywords
titanium phthalocyanines; arylthio; electropolymerization; nitrite oxidation; kinetics
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This paper investigates the catalytic activities of arylthio substituted oxotitanium phthalocyanine (OTiPc) complexes that are immobilized on the glassy carbon electrode by electropolymerization, towards the oxidation of nitrite. The complexes are peripherally and non-peripherally substituted with phenylthio and benzylthio groups, namely la, 1b, 2a and 2b. All the modified electrodes exhibited improved electrocatalytic oxidation of nitrite than the unmodified electrodes by a two-electron mechanism producing nitrate ions. Catalytic currents are enhanced and nitrite overpotential reduced to similar to 0.60 V. Kinetic parameters are determined for all complexes and a mechanism is proposed. (c) 2007 Elsevier Ltd. All rights reserved.
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