Development of Group 4 and 5 Metal Oxide Cathode with Electron Conductive Oxide

Powders of Ti and Nb metal compounds (metal complexes that contain nitrogen) were mixed and heat-treated at 1050 o C in the H 2 /Ar gas mixtures to obtain specimens with different oxidation state. An appropriate oxidation is essential to have a definite catalytic activity for the ORR. The onset potentials of partially oxidized Ti and Nb oxide mixture with the electron conductive oxide support had reached over 1.1 V vs RHE that is more than that of commercial Pt-C. The active point of our materials might have a better activity compared to Pt. Potential cycling test was conducted between 1.0 V and 1.5 V using triangler wave, and between 0.6 V and 1.0 V using rectangular wave, respectively. We have not detected the decay of activity in both cases even at 80 o C, although the current was small.