期刊
ELECTROCHIMICA ACTA
卷 55, 期 24, 页码 7290-7297出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.07.048
关键词
Niobium oxide; Niobium carbonitride; Non-platinum cathode; Polymer electrolyte fuel cell; Oxygen reduction reaction
资金
- New Energy and Industrial Technology Development Organization (NEDO)
- Japan Synchrotron Radiation Institute (JASRI) [2008B5392, 2009A5391, 2009B5390, 2008A1892, 2008B1850, 2009A1803, 2009B1821]
Partially oxidized NbC0 N-5(0) (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 N-2 gas containing O-2 of 10(-4) atm at the temperature range of 700-1000 degrees 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 degrees 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. (C) 2010 Elsevier Ltd All rights reserved
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