Partially oxidized niobium carbonitride as a non-platinum catalyst for the reduction of oxygen in acidic medium

被引：34
作者：
Nam, Kyung-Don [1 ]
Ishihara, Akimitsu [1 ]
Matsuzawa, Koichi [1 ]
Mitsushima, Shigenori [1 ]
Ota, Ken-ichiro [1 ]
Matsumoto, Masashi [2 ]
Imai, Hideto [2 ]
机构：
[1] Yokohama Natl Univ, Chem Energy Lab, Hodogaya Ku, Kanagawa 2408501, Japan
[2] NEC Corp Ltd, Green Innovat Labs, Tsukuba, Ibaraki 3058501, Japan
来源：
ELECTROCHIMICA ACTA | 2010年 / 55卷 / 24期
关键词：
Niobium oxide; Niobium carbonitride; Non-platinum cathode; Polymer electrolyte fuel cell; Oxygen reduction reaction; CATHODE; OXIDE; OXYNITRIDE; TITANIUM; SURFACE; NBN; XPS;
D O I：
10.1016/j.electacta.2010.07.048
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
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
引用
收藏
页码：7290 / 7297
页数：8
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