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Lookup NU author(s): Dr Mohamed Mamlouk,
Emeritus Professor Keith Scott
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Co based catalyst were evaluated for oxygen reduction (ORR) in liquid KOH and alkaline anion exchange membrane fuel cells (AAEMFCs). In liquid KOH solution the catalyst exhibited good performance with an onset potential 120 mV more negative than platinum and a Tafel slope of ca. 120 mV dec(-1). The hydrogen peroxide generated, increased from 5 to 50% as the electrode potential decreased from 175 to -300 mV vs. SHE. In an AAEMFC environment, one catalyst (GP2) showed promising performance for ORR, i.e. at 50 mA cm(-2) the differences in cell potential between the stable performance for platinum (more positive) and cobalt cathodes with air and oxygen, were only 45 and 67 mV respectively. The second catalyst (GP4) achieved the same stable power density as with platinum, of 200 and 145 mW cm(-2), with air at 1 bar (gauge) pressure and air (atm) cathode feed (60 degrees C), respectively. However the efficiency was lower (i.e. cell voltage was lower) i.e. 40% in comparison to platinum 47.5%. (C) 2011 Elsevier B.V. All rights reserved.
Author(s): Mamlouk M, Kumar SMS, Gouerec P, Scott K
Publication type: Article
Publication status: Published
Journal: Journal of Power Sources
Print publication date: 28/04/2011
ISSN (print): 0378-7753
ISSN (electronic): 1873-2755
Publisher: Elsevier SA
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