Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Catalysis and surface reactions III

O 88.1: Vortrag

Donnerstag, 12. März 2026, 15:00–15:15, TRE/MATH

Trapping ionomer for efficient proton exchange membrane fuel cells — •Fanpeng Kong — Harbin Institute of Technology, Harbin, China

Both uniformity of ionomer distribution and adsorption dynamics of side-chain sulfonates are paramount in determining the performance of low Pt-loaded membrane electrode assembly (MEA), particularly at high current densities. However, the heterogeneity of Pt/C leads to strong sulfonate anion adsorption on Pt sites and deleterious ionomer aggregation on the carbon support. Here, we synthesize atomic dipole modulated Pt/C (SCDC-Pt) electrocatalysts for low Pt-loaded MEA. Remarkably,this catalyst delivers a superior peak power density (1.4 W cm-2) and only a 15% of activity loss after 30 000 square-wave cycles. Operando characterization and computational analysis demonstrate that surface charged dipole facilitates homogenous ionomer distribution, while mitigating sulfonate poisoning of Pt. Electrochemical diagnostic technique establishes the low sulfonate coverage (~8%) and local O2 transport resistance (38.6 S m-1).This finding demonstrates the viability of rationally designed high-performance surface composition-homogenization low Pt-loaded MEA.

Keywords: fuel cells; low Pt-loading MEA; local O2 transport; sulfonate coverage; oxygen reduction