Abstract
Durability is essential to electrocatalyst for fuel cell application. In this study, electrochemical stability of partially oxidized tantalum carbonitride (Ta-CNO), which is one of non-precious metal electrocatalyst for oxygen reduction reaction, has been investigated. The activity was the most stable around the rest potential in oxygen atmosphere, where was ca. 1.0 V vs. RHE, in chronoamperometry. It significantly decreased in higher potential range than the rest potential, and slightly decreased in lower potential range than the rest potential. Activity decrease ratio of the Ta-CNO was almost the same to a conventional Pt/C with rectangular potential wave between 0.6 to 1.0 V vs. RHE. The activity decrease of the Ta-CNO of the mixture with carbon black was larger than that of the Ta-CNO itself for both in constant potential and potential cycling.
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