Kinetic Study of Oxygen Reduction Reaction in Acid Solution Using Titanium Oxide-based Catalysts Prepared from Oxy-titanium Tetra-pyrazino-porphyrazine

Abstract

Oxide-based electrocatalysts were investigated as non-platinum cathodes for the oxygen reduction reaction (ORR). Recently, we found that titanium oxide-based compounds produced from oxy-titanium tetra-pyrazino-porphyrazine via oxidation under low oxygen partial pressure exhibited high ORR activity [T. Hayashi et al., ECS Trans., 64(3), 247 (2014)]. However, the mechanism by which the ORR proceeds in the presence of titanium oxide-based catalysts has not yet been analyzed in detail. In this study, the ORR mechanism was investigated based on the Damjanovic model by using a rotating ring disk electrode. The titanium oxide-based catalysts showed high reactivity in the four electron reduction of O₂.