Elucidating the Role of Ionomer in the Performance of Platinum Group Metal-free Catalyst Layer via in situ Electrochemical Diagnostics

Wang, Guanxiong; Osmieri, Luigi; Star, Andrew G.; Pfeilsticker, Jason; Neyerlin, K. C.

doi:10.1149/1945-7111/ab7aa1

Title: Elucidating the Role of Ionomer in the Performance of Platinum Group Metal-free Catalyst Layer via in situ Electrochemical Diagnostics

Journal Article · Mon Mar 09 00:00:00 EDT 2020 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ab7aa1· OSTI ID:1832505

Wang, Guanxiong;

; Star, Andrew G.; Pfeilsticker, Jason;

The ionomer content in platinum group metal (PGM)-free polymer electrolyte fuel cell (PEFC) cathode catalyst layer (CCL) plays an important role in the electrode gas transport properties, proton conductivity, and hence, membrane electrode assembly (MEA) performance. In this work, the ionomer content in the CCL is varied, influencing electrode microstructure by altering porosity, tortuosity, as well as ionomer distribution and coverage of the catalyst particles. A novel technique consisting of a H ₂ pump, combined with a Pt black sensor layer, is used to measure the bulk mass transport resistance of a series of PGM-free CCL prepared with different ionomer contents. The values for bulk electrode mass transport resistance are contrasted with electrode proton transport resistance in the cathode catalyst layer, establishing a clearly defined trade-off between two key performance limiting phenomena and identifying a need for novel PGM-free electrode fabrication strategies.

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

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1832505

Alternate ID(s):: OSTI ID: 1665788

Report Number(s):: NREL/JA-5900-77218

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 167 Journal Issue: 4; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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