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Temperature Dependence of Oxygen Reduction Catalyzed by Cobalt Fluoro‐Phthalocyanine Adsorbed on a Graphite Electrode
Author(s) -
Song C.,
Zhang L.,
Zhang J.,
Wilkinson D. P.,
Baker R.
Publication year - 2007
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200500205
Subject(s) - electrocatalyst , catalysis , cobalt , cyclic voltammetry , chemistry , electrochemistry , inorganic chemistry , adsorption , phthalocyanine , methanol , electrode , graphite , organic chemistry
The graphite electrode surface onto which cobalt(II) 1,2,3,4,8,9,10,11,15,16,17,18,22,23,24,25‐hexadecafluoro‐29 H ,31 H ‐phthalo‐cyanine (abbreviated as Co II HFPC) is adsorbed displays a strong electrocatalytic activity toward O 2 reduction. The electrochemical response of surface adsorbed Co II HFPC is investigated at different pHs and temperatures by cyclic voltammetry. The kinetics of the catalyzed O2 reduction at different temperatures, measured by cyclic voltammetric and rotating disk electrode methods, is analyzed and a corresponding reaction mechanism is proposed. A two‐electron/two‐proton process is found to be the dominating pathway for Co II HFPC catalyzed O 2 reduction. The increase in temperature, from 20 to 70 °C, enhances the reduction rate significantly. The presence of methanol has no effect on its catalytic activity towards O 2 reduction. The implications of using this non‐noble electrocatalyst for the cathode reaction in low temperature fuel cells, including direct organic, metal‐air fuel cells, etc., are discussed in this paper.