Enhancing oxygen transport in the ionomer film on platinum catalyst using ionic liquid additives.

ABSTRACT: The O₂ permeation barrier across the nanoscale ionomer films on electrocatalysts contributes to a major performance loss of proton exchange membrane (PEM) fuel cells under low Pt loading. Enhancing O₂ transport through the ionomer films is essential for developing low Pt loading catalyst materials in high-performance PEM fuel cells. This study found that adding an ionic liquid (IL) can effectively mitigate the dense ionomer ultrathin sublayer formed on the Pt surface, which severely hinders O₂ transport to the catalyst sites. The molecular dynamics simulation results show that adding the IL significantly alters the ionomer ultrathin sublayer structure by inhibiting its tight arrangement of perfluorosulfonic acid chains but scarcely impacts the ultrathin sub

SUBMITTER: Fan L 

PROVIDER: S-EPMC11197526 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature