Post-assembly modification of polymeric composite membranes using spin drying for fuel cell applications

Kyung Ah Lee, Ki Ro Yoon, Sung Hyun Kwon, Kyung Jin Lee, Sunhee Jo, Ju Sung Lee, Kwan Young Lee, Seung Woo Lee, Seung Geol Lee, Jin Young Kim

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Self-assembly of inter- and intraphases between the ionomer membrane and mechanical reinforcements in reinforced polymeric composite membranes is of great interest in both physics and chemistry, particularly for proton exchange membrane fuel cell (PEMFC) application. One of the greatest challenges is to obtain an optimally structured polytetrafluoroethylene (PTFE)-reinforced perfluorosulfonic acid (PFSA) composite membrane via solution processing. For high- performance and durable PEMFC applications, the self-assembly of interphases of the ionomers/reinforcements and intraphases of the ionomers in the composite PEM needs to be carefully tailored. Here, we show that post-assembly modification of a PTFE/PFSA composite membrane using a spin-drying method can significantly improve fuel cell performance and reliability. The forced assembly of PFSA ionomers during spinning results in greater infiltration yields into the porous PTFE media. In this way, spin-drying post-treatment results in lower gas crossover and improved mechanical durability. This process also yields larger regions of ionic clusters, which facilitate proton conduction at low relative humidity, affording higher fuel cell currents and greater efficiency.

Original languageEnglish
Pages (from-to)7380-7388
Number of pages9
JournalJournal of Materials Chemistry A
Volume7
Issue number13
DOIs
Publication statusPublished - 2019

Bibliographical note

Funding Information:
This work was supported by the KIST Institutional Programs (2E28271 and KIST Young Fellow). This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea (2016M3A6A7945505), and the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT, & Future Planning (NRF-2015M1A2A2056690). This research was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1A6A3A01011591), and Korea Institute of Energy Technology Evaluation and Planning (KETEP) grand funded by the Korea government (MOTIE) (No. 20188550000440).

Publisher Copyright:
© The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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