Abstract
Interest in anionic exchange membrane fuel cell (AEMFC) technology has increased in recent years because of the possibility of using a variety of new catalyst materials in the alkaline environment. Pt and Ni are popular base metal substrates for the development of highly active catalysts in many studies. However, for commercial use, catalyst stability is paramount. In commercial applications, such as back-up power systems, catalysts must tolerate high steady state potentials for extended periods of time. This could be detrimental to catalyst materials, especially at the cathode. Yet, the stability of Pt and Ni in AEMFC environment is not fully understood under steady state potential. In this paper, the stabilities of Pt and Ni supported on carbon have been tested using a standby cell potential of 0.9 V, within an AEMFC environment. The study, combined with SEM, TEM, ICP-AES, and ICP-MS analysis results, shows significant morphology changes in the supported Pt and Ni catalyst particles, as well asdissolved Pt and Ni in the AEM electrolyte with 0.14mgPt gAEM−1 and 0.2mgNi gAEM−1 after an one month test period. The Pt migration appears to be driven by the electric field while Ni appears to show generic chemical diffusion.
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