Journal
ACS OMEGA
Volume 2, Issue 2, Pages 678-684Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.6b00555
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Funding
- Japanese New Energy and Industrial Technology Development Organization (NEDO)
- Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
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Most nonplatinum group metal (non-PGM) catalysts for polymer electrolyte fuel cell cathodes have so far been limited to iron(cobalt)/nitrogen/carbon [Fe(Co)/N/C] composites owing to their high activity in both half-cell and single-cell cathode processes. Group IV and V metal oxides, another class of non-PGM catalysts, are stable in acidic media; however, their activities have been mostly evaluated for half-cells, with no single-cell performances comparable to those of Fe/N/C composites reported to date. Herein, we report successful syntheses of zirconium oxynitride catalysts on multiwalled carbon nanotubes, which show the highest oxygen reduction reaction activity among oxide-based catalysts. The single-cell performance of these catalysts reached 10 mA cm(-2) at 0.9 V, being comparable to that of state-of-the-art Fe/N/C catalysts. This new record opens up a new pathway for reaching the year 2020 target set by the U. S. Department of Energy, that is, 44 mA cm(-2) at 0.9 V.
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