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Title: Effects of MEA Fabrication and Ionomer Composition on Fuel Cell Performance of PGM-Free ORR Catalyst

Journal Article · · ECS Transactions (Online)
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Carbon-based platinum group metal-free (PGM-free) catalysts for oxygen reduction reaction (ORR) have received increasing attention as potential candidates for low-cost fuel cell cathode catalysts. Mass-transport within the very thick catalyst layer (CL) presents a major challenge to further improve the fuel cell performance of PGM-free catalysts, which may be realized through the optimization of CL structure. Herein, we demonstrate that membrane electrode assemblies (MEAs) with not hot-pressed PGM-free cathode showed improved H2-air fuel cell performance in mass transport region when compared to MEAs prepared via hot-pressing technique. Further, the effects of the ionomer content and equivalent weight (EW) on fuel cell performance were systematically explored. We observed that an increase in ionomer content resulted in performance improvement in the kinetic region, while negatively affecting the performance in the mass transport region. The overall optimum fuel cell performance was achieved with an ionomer EW of 830 g mol-1.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE). Fuel Cell Technologies Program (EE-3F)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1463547
Report Number(s):
LA-UR-17-24947
Journal Information:
ECS Transactions (Online), Vol. 77, Issue 11; ISSN 1938-6737
Publisher:
Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

Cited By (4)

Integrating PGM‐Free Catalysts into Catalyst Layers and Proton Exchange Membrane Fuel Cell Devices journal December 2018
Progress in the Development of Fe‐Based PGM‐Free Electrocatalysts for the Oxygen Reduction Reaction journal December 2018
Molecular Design of Single‐Atom Catalysts for Oxygen Reduction Reaction journal February 2020
A Structure and Durability Comparison of Membrane Electrode Assembly Fabrication Methods: Self-Assembled Versus Hot-Pressed journal January 2018

Figures / Tables (8)

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Energy Sciences