Yu. E. Evstefeeva, L. A. Khanova, Yu. V. Pleskov, and A. M. Baranov*
Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117071 Russia
* NPO Vakuummashpribor, Nagornyi pr. 7, Moscow, 113105 Russia
Received January 15, 1999
Abstract—Reactions of cobalt tetramethylphenylporphyrin (CoTMPP) and oxygen at diamond-like carbon (a-
C:H) and platinum are studied by analyzing cyclic voltammograms. The conclusion made earlier that electro-
catalytic activity of a-C:H drastically increases upon introducing platinum therein is corroborated. At the a-
C:H/Pt electrodes, redox reactions involving CoTMPP from an acetone solution and the reduction reaction of
oxygen from aqueous solutions are studied. The a-C:H/Pt electrode activity in these two reactions hardly differs
from that of platinum. The difference in electrode behavior between a-C:H/Pt and platinum is in a significantly
more negative potential required for the reduction of oxygen chemisorbed at a-C:H/Pt.
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