Jäger, R.; Härk, E.; Steinberg, V.; Lust, E.: Influence of Temperature on the Oxygen Electroreduction Activity at Micro-Mesoporous Carbon Support. Journal of The Electrochemical Society 163 (2016), p. F284-F290
10.1149/2.0861603jes
Abstract:
Influence of temperature on the kinetics of oxygen electroreduction on molybdenum carbide derived carbon based catalysts has been analyzed in O2 saturated 0.1M KOH solution using rotating disc electrode and cyclic voltammetry methods. The calculated kinetic current density value (|jkin| = 62.6 A m−2) at the half-wave potential (−0.05 V vs. Hg|HgO|0.1M KOH) of platinum nanoparticles modified catalyst was maximal at 60°C. Two different linear areas in the Tafel-like plot have been observed for unmodified and Pt nanoparticles modified catalysts within the studied temperature range from 10 to 80°C. The calculated experimental apparent activation energy values for the oxygen reduction were within a range from 19 to 27 kJ mol−1 for Pt nanoparticles modified carbon catalyst within potential range from 0.05 to −0.07 V vs. Hg|HgO|0.1M KOH. The oxygen reduction peak current density values decrease with increasing the temperature from 10 to 80°C.