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

Energies

Christina Roth²  Peter Bleith³  Christoph A. Schwl¹  Sebastian Kaserer¹ 

[1] Institute for Materials Science, Technische Universität Darmstadt, Darmstadt 64289, Germany; E-Mails:;Physikalische und Theoretische Chemie, Freie Universität Berlin, Berlin 14195, Germany;Paul Scherrer Institut, Villigen 5232, Switzerland; E-Mail:

关键词: CV;    fuel cell tests;    PEMFC;    alternative supports;    non-oxide ceramics;    coloring;    durability;    TiO₂;    TiB₂;   

DOI  :  10.3390/en7063642

来源: mdpi

【 摘 要 】

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 μm-sized TiB₂ 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, TiB₂ 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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.