Characterization of a Sulfonated Poly(Ionic Liquid) Block Copolymer as an Ionomer for Proton Exchange Membrane Fuel Cells using Rotating Disk Electrode

Gawas, Ramchandra; Sun, Rui; Li, Yawei; Neyerlin, Kenneth C.; Elabd, Yossef A.; Tang, Maureen; Snyder, Joshua

doi:10.1149/1945-7111/ac4375

Title: Characterization of a Sulfonated Poly(Ionic Liquid) Block Copolymer as an Ionomer for Proton Exchange Membrane Fuel Cells using Rotating Disk Electrode

Journal Article · Fri Dec 24 00:00:00 EST 2021 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ac4375· OSTI ID:1866772

Gawas, Ramchandra; Sun, Rui; Li, Yawei; Neyerlin, Kenneth C.; Elabd, Yossef A.; Tang, Maureen; Snyder, Joshua

Ionic liquid (IL) additives to both traditional and advanced oxygen reduction reaction (ORR) electrocatalysts have yielded remarkable improvements in catalyst performance and durability. However, incorporating ILs or IL-modified catalysts into the electrodes of a proton exchange membrane fuel cell (PEMFC) membrane electrode assembly (MEA) has proven to be challenging. Sulfonated poly(ionic liquid) block copolymers (S-PILBCP) present an opportunity to incorporate IL functionality directly into the ionomer, orthogonal to protonic conductivity. Here, we use a rotating disc electrode (RDE) to characterize the interface between a S-PILBCP and Pt catalyst in comparison to Nafion. Catalyst thin films prepared with S-PILBCP show an 80% improvement in the ORR activity over those containing Nafion. Thin films of S-PILBCP also show a significantly reduced degree of poisoning sulfonate adsorption on a Pt(111) surface in comparison to Nafion. These half-cell results provide useful insights that help to highlight the source of the impact of the S-PILBCP on PEMFC MEA performance.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Hydrogen and Fuel Cell Technologies Office (EE-3F)

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 1866772

Report Number(s):: NREL/JA-5900-82850; MainId:83623; UUID:0de181ef-b182-41ee-b39f-54d0f72c2c3d; MainAdminID:64463

Journal Information:: Journal of the Electrochemical Society, Vol. 168, Issue 12

Country of Publication:: United States

Language:: English

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Title: Characterization of a Sulfonated Poly(Ionic Liquid) Block Copolymer as an Ionomer for Proton Exchange Membrane Fuel Cells using Rotating Disk Electrode

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