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HERO ID
4947115
Reference Type
Journal Article
Title
Tuning the Ionomer Distribution in the Fuel Cell Catalyst Layer with Scaling the Ionomer Aggregate Size in Dispersion
Author(s)
Doo, G; Lee, JH; Yuk, S; Choi, S; Lee, DH; Lee, DW; Kim, HG; Kwon, SH; Lee, SG; Kim, HT
Year
2018
Is Peer Reviewed?
1
Journal
ACS Applied Materials & Interfaces
ISSN:
1944-8244
EISSN:
1944-8252
Volume
10
Issue
21
Page Numbers
17835-17841
Language
English
PMID
29722957
DOI
10.1021/acsami.8b01751
Web of Science Id
WOS:000434101200033
Abstract
With the demands for better performance of polymer electrolyte membrane fuel cells, studies on controlling the distribution of ionomers have recently gained interest. Here, we present a tunable ionomer distribution in the catalyst layer (CL) with dipropylene glycol (DPG) and water mixtures as the ionomer dispersion medium. Dynamic light scattering and molecular dynamics simulation demonstrate that, by increasing the DPG content in the dispersion, the size of the ionomer aggregates in the dispersion is exponentially reduced because of the higher affinity of DPG for Nafion ionomers. The ionomer distribution of the resulting CLs dictates the dimensional feature of the ionomer dispersion. Although the ionomer distribution becomes more uniform with increasing the DPG content, an optimal power performance is obtained at a DPG content of 50 wt % regardless of feed humidity because of balanced proton and mass transports. As a guide for tuning the ionomer distribution, we suggest that the ionomer aggregates in the dispersion with a size close to that of the Pt/C aggregates form a highly connected ionomer network and maintain a porosity in the catalyst/ionomer aggregate, resulting in high power performance.
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