Studies of selectivity of oxygen reduction reaction in acidic electrolyte on electrodes modified by products of pyrolysis of polyacrylonitrile and metalloporphyrins

E. S. Davydova E. S. Davydova , M. R. Tarasevich M. R. Tarasevich
Российский электрохимический журнал
Abstract / Full Text

The rotating disk electrode technique was used to study in 0.5 M H2SO4 catalytic properties of products of pyrolysis of the metal-free polyacrylonitrile/carbon black composite, polyacrylonitrile/iron/carbon black composite, and also supported pyropolymers of Co(II) tetramethoxyphenyl porphyrine (CoTMPP) and Fe(III) tetramethoxyphenyl porphyrin chloride (FeTMPPCl). It is shown that the metal-free polyacrylonitrile/carbon black composite catalyzes the oxygen reduction reaction via the parallel path. Addition of up to 2% of Fe into the composite results in abrupt growth of the catalytic activity and share of the four-electron reaction, which provides the parallel–serial reaction path. The parallel reaction with no further catalytic conversion of H2O2 occurs on catalysts of the CoTMPP/Vulcan XC72 and FeTMPPCl/Vulcan XC72 series. The chemical composition is one of the key factors affecting activity and selectivity of CoTMPP/Vulcan XC72 catalysts. An increase in the precursor content from 5 to 30% is accompanied by an increase in selectivity k 1/k 2 from 0.14–0.30 to 0.5–1.7, where k 1 is the rate constant of the reaction of O2 reduction to H2O, k 2 is the rate constant of the reaction of O2 reduction to H2O2.

Author information
  • Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia

    E. S. Davydova & M. R. Tarasevich

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