Tipping Water Balance and the Pt Loading Effect in Polymer Electrolyte Fuel Cells: A Model-based Analysis

Resource type
Date created
2018-02
Authors/Contributors
Abstract
The commercial deployment of polymer electrolyte fuel cells (PEFCs) hinges on breakthroughs in design and integration of highly performing and durable catalyst layers with drastically reduced platinum loading. Experimental studies have shown an unexpected increase in voltage losses upon a drastic reduction in the Pt content. In an effort to unravel this peculiar behavior, an existing physical model of catalyst layers in PEFCs is employed to analyze a wide range of fuel cell performance data from the literature. The analysis reveals correlated trends in key fuel cell parameters. These findings can be explained in view of the tipping water balance that affects the interplay of transport and reaction in catalyst layer and gas diffusion media. This represents a compelling alternative to the widespread ionomer-film hypothesis that links observed power losses at low Pt loading to a mesoscopic oxygen transport resistance. The presented theoretical analysis warrants the definition of a correlation exponent that should find use in assessing the merit of different approaches in catalyst layer fabrication.
Document
Identifier
DOI: 10.1039/C8SE00026C
Published as
Muzaffar, T., Kadyk, T. and Eikerling, M. (2018). Tipping Water Balance and the Pt Loading Effect in Polymer Electrolyte Fuel Cells: A Model-based Analysis. Sustainable Energy Fuels. February 2018. DOI: 10.1039/C8SE00026C
Publication title
Sustainable Energy Fuels
Document title
Tipping Water Balance and the Pt Loading Effect in Polymer Electrolyte Fuel Cells: A Model-based Analysis
Date
2018
Publisher DOI
10.1039/C8SE00026C
Copyright statement
Copyright is held by the author(s).
Scholarly level
Peer reviewed?
Yes
Language
Member of collection
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wb_sc_tm_sef_submitted_feb_19_clean.pdf 1.39 MB