A Membrane-Free and Practical Mixed Electrolyte Direct Borohydride Fuel Cell

A membrane-free direct borohydride fuel cell that is operated with a borohydride containing electrolyte is designed and constructed. Main focus of this study is the cathode catalyst that has to show high tolerance against borohydride. Both catalysts, Ag-Mn3O4/C as cathode catalyst and commercial Pt/...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2016-01, Vol.163 (3), p.F278-F283
Main Authors: Grimmer, Christoph, Zacharias, Robert, Grandi, Maximilian, Pichler, Birgit, Kaltenboeck, Ilena, Gebetsroither, Florian, Wagner, Julian, Cermenek, Bernd, Weinberger, Stephan, Schenk, Alexander, Hacker, Viktor
Format: Article
Language:English
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Summary:A membrane-free direct borohydride fuel cell that is operated with a borohydride containing electrolyte is designed and constructed. Main focus of this study is the cathode catalyst that has to show high tolerance against borohydride. Both catalysts, Ag-Mn3O4/C as cathode catalyst and commercial Pt/C as anode catalyst, are characterized electrochemically using a rotating disk electrode. The number of exchanged electrons is calculated employing Levich and Koutecky-Levich analysis. Cathodes are fabricated using a cross rolling method with an in-house made gas diffusion layer. A cell with an implemented Luggin capillary is designed in order to follow the electrode potentials. The BH4−/O2 fuel cell shows a power density of 17 mW cm−2 using a 1 M NaBH4/1 M NaOH/5 mM thiourea electrolyte.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.1111603jes