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rator okyo U studi des in xygen ion in 612 # A ceived rosion resistance materials. Recently, transition metal nitrides and baddeleyite, monoclinic ZrO2.11 The structure of Ta3N5 consists of e Let 0 © T Downlooxynitrides have been studied for use as visible light driven photocatalysts.7-10 In this study, we have investigated the catalytic activity and the stability of tantalum oxynitrides for the ORR of polymer electrolyte fuel cells in order to develop a new catalys