Effect of Ionic Liquids on the Structure of Ionomer Inks
Tyler B. Martin, Kimber Stamm Masias
TL;DR
This study shows how ionic liquids affect the structure of inks used in fuel cells, impacting their performance.
Contribution
The novel contribution is identifying how specific ionic liquids alter ionomer-catalyst interactions in fuel cell inks.
Findings
Ionic liquid composition affects ionomer arrangement and interactions in catalyst inks.
The [BMIM][C4] ionic liquid reduces platinum site availability and PEMFC performance.
These structural insights can guide better ionic liquid formulations for fuel cells.
Abstract
This study investigates the impact of ionic liquids (ILs) on the structure and performance of catalyst inks used in proton exchange membrane fuel cells (PEMFCs). Using contrast variation small-angle neutron scattering (CV-SANS), we elucidate the structural interactions between ionomers, Pt/C catalyst particles, and ILs. The analysis reveals that IL composition significantly influences the arrangement of ionomers and their interactions with other ink components. In particular, one of the ILs ([BMIM][C4]) exhibited stronger associations with both ionomer and catalyst particles, resulting in reduced availability of platinum catalytic sites and lower PEMFC performance. These findings demonstrate the structural origins of electrochemical performance variations, providing insights into the design of improved ionic liquid formulations for enhanced fuel cell efficiency.
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Taxonomy
TopicsAdvanced Memory and Neural Computing · Analytical Chemistry and Sensors · Transition Metal Oxide Nanomaterials