Partially oxidized niobium carbonitride as a non-platinum catalyst for the reduction of oxygen in acidic medium
2010; Elsevier BV; Volume: 55; Issue: 24 Linguagem: Inglês
10.1016/j.electacta.2010.07.048
ISSN1873-3859
AutoresKyung-Don Nam, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Matsumoto, Hideto Imai,
Tópico(s)Semiconductor materials and devices
ResumoPartially oxidized NbC0.5N0.5 has been evaluated as a non-platinum catalyst for the reduction of oxygen in acidic medium. NbC0.5N0.5 powder was partially oxidized in N2 gas containing O2 of 10−4 atm at the temperature range of 700–1000 °C. Partially oxidized NbC0.5N0.5 had a definite oxygen reduction reaction (ORR) activity, while as-prepared NbC0.5N0.5 and completely oxidized Nb2O5 had a poor catalytic activity for ORR. The onset potential of the partially oxidized NbC0.5N0.5 for the ORR achieved 0.92 V vs. RHE in 0.1 M H2SO4 at 30 °C. The results of X-ray absorption spectroscopy and ionization potential measurements suggested that oxygen-vacancy defects might be responsible for the oxygen reduction capability by creating electronically favorable oxygen adsorption sites.
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