Importance of Fuel Cell Tests for Stability Assessment—Suitability of Titanium Diboride as an Alternative Support Material

Christina Roth, Peter Bleith, Christoph A. Schwöbel, Sebastian Kaserer and Jens Eichler
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Christina Roth: Physikalische und Theoretische Chemie, Freie Universität Berlin, Berlin 14195, Germany
Peter Bleith: Paul Scherrer Institut, Villigen 5232, Switzerland
Christoph A. Schwöbel: Institute for Materials Science, Technische Universität Darmstadt, Darmstadt 64289, Germany
Sebastian Kaserer: Institute for Materials Science, Technische Universität Darmstadt, Darmstadt 64289, Germany
Jens Eichler: ESK Ceramics GmbH und Co. KG, Kempten 87437, Germany

Energies, 2014, vol. 7, issue 6, 1-11

Abstract: Carbon corrosion is a severe issue limiting the long-term stability of carbon-supported catalysts, in particular in the highly dynamic conditions of automotive applications. (Doped) oxides have been discussed as suitable alternatives to replace carbon, but often suffer from poor electron conductivity. That is why non-oxide ceramics, such as tungsten carbide and titanium nitride, have been discussed recently. Titanium diboride has also been proposed, due to its promising activity and stability in an aqueous electrochemical cell. In this work, Pt nanoparticles were deposited onto ?m-sized TiB 2 particles with improved grain size, manufactured into porous gas diffusion electrodes and tested in a realistic polymer electrolyte membrane (PEM) fuel cell environment. In contrast to the model studies in an aqueous electrochemical cell, in the presence of oxygen and high potentials at the cathode side of a real fuel cell, TiB 2 becomes rapidly oxidized as indicated by intensely colored regions in the membrane-electrode assembly (MEA). Moreover, already the electrode manufacturing process led to the formation of titanium oxides, as shown by X-ray diffraction measurements. This demonstrates that Cyclic Voltammetry (CV) measurements in an aqueous electrochemical cell are not sufficient to prove stability of novel materials for fuel cell applications.

Keywords: CV; fuel cell tests; PEMFC; alternative supports; non-oxide ceramics; coloring; durability; TiO 2; TiB 2 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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