Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 156, Issue 7, Pages B811-B815Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3125801
Keywords
-
Funding
- New Energy and Industrial Technology Development Organization, Japan (NEDO)
Ask authors/readers for more resources
Niobium catalysts with and without barium are dispersed on particulate carbon black by a polymerized complex method as a non-noble metal cathode for polymer electrolyte fuel cells (PEFCs). The barium-niobium composites were prepared by a polymerized complex method involving the addition of carbon black during the polymerization process, followed by nitridation under flowing ammonia. The material exhibits improved activity for oxygen reduction under acidic conditions, achieving an onset potential of 0.77 V vs normal hydrogen electrode (NHE). This onset potential is markedly higher than that for niobium composites prepared by conventional impregnation (0.52 V vs NHE). The production of H2O2 by the two-electron reduction of oxygen was observed at potentials of less than 0.25 V vs NHE (approximately 5.4%). The onset potential of these catalysts is found to be dependent on the crystallinity and Nb5+ content on the surface and in the bulk, which can be controlled by the addition of barium and the conditions of pretreatment using an inert gas (nitrogen) before nitridation. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3125801] All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available