Journal
ELECTROCHIMICA ACTA
Volume 143, Issue -, Pages 1-9Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.07.138
Keywords
Oxygen reduction reaction; Electrocatalyst; Covalent; Compound
Categories
Funding
- National Natural Science Foundation of China [31170110, 20906043]
- Postgraduate Innovation Project of China university of petroleum (East China) [YCX2014068]
- China Postdoctoral Science Foundation [2013M530397]
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Indole-5-carboxylic acid monomer was electropolymerized on carbon modified glass carbon (GC) electrode, followed by the covalent bonding with pyridine-2,4-diamine by using 1-ethyl-(3-(dimethyl-amino-propyl)carbodiimide (EDAC), N-hydroxysulfosuccinimide sodium salt (NHS) catalyst, and then was complexed with copper ions to obtain the composite (CuINPD/C). The morphology and the chemical composition of the CuINPD/C catalyst were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. Electrochemical measurements such as cyclic voltammetry, rotating disk electrode, rotating ring-disk electrode and electrochemical impedance spectroscopy were applied to obtain the mechanisms of the oxygen reduction reaction (ORR). All electrochemical measurements demonstrate that CuINPD/C is a good catalyst with excellent stability due to copper ions doping and carbon modification, which play a key role in increasing the current density and enhancing the charge transfer kinetics. Moreover, the average electron transfer number is about 3.1, indicating the ORR of CuINPD/C may takes a coexisting pathway involving both the two-electron and four-electron transfers. (C) 2014 Elsevier Ltd. All rights reserved.
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