Journal
ELECTROCHIMICA ACTA
Volume 121, Issue -, Pages 93-101Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.132
Keywords
gold nanoparticles; cobalt tetraaminophthalocyanines; nitrite; electrocatalysis
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Funding
- Department of Science and Technology (DST)
- National Research Foundation (NRF), South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology
- Rhodes University
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We report on the electrodeposition of gold nanoparticles (AuNPs) onto the glassy carbon electrode (GCE) followed by polymerization of cobalt tetraamino phthalocyanine (CoPc(NH2)(4)) on top (represented as poly-CoPc(NH2)(4)-/AuNPs-GCE). The modified electrode where CoPc(NH2)(4) is polymerized first followed by deposition of AuNPs is represented as AuNPs/poly-CoPc(NH2)(4)-GCE. In the absence of AuNPs, the electrode is represented as poly-CoPc(NH2)(4)-GCE or for AuNPs alone (AuNPs-GCE). The surface coverage was 1.5 x 10(-9) mol cm(-2) for AuNPs-GCE and 3.0 x 10(-9) mol cm(-2) for the rest of the modified electrodes. AuNPs/CoPc(NH2)(4)-GCE exhibited high electrocatalytic activity towards the oxidation of nitrite, with detection potential of 0.76V. The catalytic rate constant of 3.96 x 10(7) cm(3) mol(-1) s(-1) was obtained for nitrite oxidation. (C) 2014 Elsevier Ltd. All rights reserved.
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