Influence of Temperature on the Oxygen Electroreduction Activity at Nanoporous Carbon Support

Abstract

Influence of temperature on the oxygen reduction kinetics of various catalysts has been analyzed in O 2 saturated 0.1M KOH solution using rotating disc electrode method. Several important reaction parameters, such as the number of electrons transferred per one oxygen molecule, the slope values of Tafel-like plots at different temperatures, and the apparent activation energies for the oxygen reduction reaction were obtained. The calculated absolute kinetic current density value (62.6 A m -2 ) at the half-wave potential (-0.05V vs. HgêHgOê0.1M KOH) of platinum nanoparticles modified catalyst was maximum at 60 o C. Calculated apparent activation energies were within a range from 19 to 27 kJ mol -1 at Pt nanoparticles modified molybdenum carbide derived carbon catalyst within potential range from 0.05 to -0.07V vs. HgêHgOê0.1M KOH.