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Electrochemical and fuel cell evaluation of Co based catalyst for oxygen reduction in anion exchange polymer membrane fuel cells

Lookup NU author(s): Professor Mohamed MamloukORCiD, Emeritus Professor Keith Scott

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Abstract

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.

Publication metadata

Author(s): Mamlouk M, Kumar SMS, Gouerec P, Scott K

Publication type: Article

Publication status: Published

Journal: Journal of Power Sources

Year: 2011

Volume: 196

Issue: 18

Pages: 7594-7600

Print publication date: 28/04/2011

ISSN (print): 0378-7753

ISSN (electronic): 1873-2755

Publisher: Elsevier SA

URL: http://dx.doi.org/10.1016/j.jpowsour.2011.04.045

DOI: 10.1016/j.jpowsour.2011.04.045

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