Nanostructured catalyst layer allowing production of ultralow loading electrodes for polymer electrolyte membrane fuel cells with superior performance
Author(s)
Jackson, Colleen
Metaxas, Michalis
Dawson, Jack
Kucernak, Anthony R
Type
Journal Article
Abstract
This study introduces a simple method to produce ultralow loading catalyst-coated membrane electrodes, with an integrated carbon “nanoporous layer”, for use in polymer electrolyte membrane fuel cells or other electrochemical devices. This approach allows fabrication of electrodes with loadings down to 5.2 μgPt cm–2 on the anode and cathode (total 10.4 μgPt cm–2, Pt3Zn/C catalyst) in a controlled, uniform, and reproducible manner. These layers achieve high utilization of the catalyst as measured through electrochemical surface area and mass specific activities. Electrodes composed of Pt/C, PtNi/C, Pt3Co/C, and Pt3Zn/C catalysts containing 5.2–7.1 μgPt cm–2 have been fabricated and tested. These electrodes showed an impressive performance of 111 ± 8 A mgPt–1 at 0.65 V on Pt3Co/C with a power density of 31 ± 2 kW gPt,total–1, about double that of the best previous literature electrodes under the same operating conditions. The performance appears apparently mass transport free and dominated by electrokinetics over a very wide potential range, and thus, these are ideal systems to study oxygen electrokinetics within the fuel cell environment. The improved performance is associated with reduced “contact resistance” and more specifically a reduction in the resistance to lateral current flow in the catalyst layer. Analytical expressions for the effect illuminate approaches to improve electrode design for electrochemical devices in which catalyst utilization is key.
Date Issued
2023-12-25
Date Acceptance
2023-11-09
Citation
ACS Applied Energy Materials, 2023, 6 (24), pp.12296-12306
ISSN
2574-0962
Publisher
American Chemical Society
Start Page
12296
End Page
12306
Journal / Book Title
ACS Applied Energy Materials
Volume
6
Issue
24
Copyright Statement
Copyright © 2023 The Authors. Published by American Chemical Society. This publication is licensed under
CC-BY 4.0.
CC-BY 4.0.
License URL
Identifier
http://dx.doi.org/10.1021/acsaem.3c01987
Publication Status
Published
Date Publish Online
2023-12-05