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Registered charity number: 207890 www.rsc.org/MaterialsA As featured in: See M. Chisaka, A. Ishihara et al., J. Mater. Chem. A, 2015, 3, 16414.Showcasing work on slightly oxidized Ta 3 N 5 catalysts for oxygen reduction reaction by Dr. Chisaka at Hirosaki University and a group of Prof. Ishihara and Prof. Ota at Yokohama National University.Title: Nano-TaO x N y particles synthesized from oxy-tantalum phthalocyanine: how to prepare precursors to enhance the oxygen reduction reaction activity after ammonia pyrolysis? Nano-TaO x N y oxygen reduction reaction catalysts with a new active site, slightly oxidized-Ta 3 N 5 , were synthesized for use in polymer electrolyte fuel cell cathodes.

In order to develop a non-precious metal cathode for PEFCs, we have tried to improving oxygen reduction activity of Zr oxide-based cathodes. We succeeded to prepare Zr oxide-based cathodes with fine primary particles using zirconium oxy-phthalocyanine as a starting material. However, secondary particle size was very large, resulting that the activity was insufficient. Therefore, we performed ball mill to crack secondary particles for increasing the actual surface area. In addition, nitridation of oxide-based compounds was performed to increase the active sites for oxygen reduction reaction such as oxygen defects and/or nitrogen atoms including oxide lattice.

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