Abstract
Solvent-based processing is the most favored method for the fabrication of electrocatalyst layers of proton exchange membrane fuel cells. In this process, the catalyst supported on carbon and stabilized by an ionomer is dispersed in a continuous solvent medium, forming a catalyst ink. Although the importance of ink processing has been realized, it is still governed by empiricism. To this end, we systematically investigated the effects of catalyst ink processing on the colloidal stability and the electrochemical performance of membrane electrode assemblies (MEAs). Analytical centrifugation and electron microscopy were employed to characterize the catalyst inks. It was found that high-pressure homogenization produced the most stable ink with maximum MEA performance in comparison to dispersion by ultrasonication. This study paves the way for a better understanding of the process-structure-property relationships towards the development of knowledge-based electrocatalyst inks.
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