Mitigation of PEM Fuel Cell Catalyst Degradation with Porous Carbon Supports

Padgett, Elliot; Yarlagadda, Venkata; Holtz, Megan E.; Ko, Matthew; Levin, Barnaby D.  A.; Kukreja, Ratandeep Singh; Ziegelbauer, Joseph M.; Andrews, Ross N.; Ilavsky, Jan; Kongkanand, Anusorn; Muller, David A.

doi:10.1149/2.0371904jes

Title: Mitigation of PEM Fuel Cell Catalyst Degradation with Porous Carbon Supports

Journal Article · 21 February 2019 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.0371904jes · OSTI ID:1495620

^[1];

^[2]; Holtz, Megan E. ^[1]; Ko, Matthew ^[1]; Levin, Barnaby D. A. ^[1]; Kukreja, Ratandeep Singh ^[2]; Ziegelbauer, Joseph M. ^[2]; Andrews, Ross N. ^[3]; Ilavsky, Jan ^[3];

^[2]; Muller, David A. ^[4]

Cornell Univ., Ithaca, NY (United States)
General Motors, Pontiac, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Cornell Univ., Ithaca, NY (United States); Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States)

Maintaining high performance after extensive use remains a key challenge for low-Pt proton exchange membrane fuel cells for transportation applications. Strategically improving catalyst durability requires better understanding of the relationship between degradation mechanisms and catalyst structure. To investigate the effects of the carbon support morphology, we compare the electrochemical performance and durability of membrane electrode assemblies (MEAs) using Pt and PtCox catalysts with a range of porous, solid, and intermediate carbon supports (HSC, Vulcan, and acetylene black). We find that electrochemical surface area (ECSA) retention after a catalyst-targeted durability test tends to improve with increasing support porosity. Using electron microscopy, we investigate microstructural changes in the catalysts and reveal the underlying degradation mechanisms in MEA specimens. Pt migration to the membrane and catalyst coarsening, measured microscopically, together were quantitatively consistent with the ECSA loss, indicating that these were the only two significant degradation pathways. Changes in catalyst particle size, morphology, and PtCo core-shell structure indicate that Ostwald ripening is a significant coarsening mechanism for catalysts on all carbons, while particle coalescence is only significant on the more solid carbon supports. Porous carbon supports thus appear to protect against particle coalescence, providing an effective strategy for mitigating catalyst coarsening.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357; EE0007271

OSTI ID:: 1495620

Alternate ID(s):: OSTI ID: 1510484

Journal Information:: Journal of the Electrochemical Society, Vol. 166, Issue 4; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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