Advanced performance and ultra-high, long-term durability of acid-base blended membranes over 900 hours containing sulfonated PEEK and quaternized poly(arylene ether sulfone) in H2/O2 fuel cells

Ae Rhan Kim, Milan Babu Poudel, Ji Young Chu, Vinothkannan Mohanraj, Ramasamy Santhosh Kumar, Natarajan Logeshwaran, Byung-Hyun Park, Myung-Kwan Han, Dong Jin Yoo

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59 Citations (Scopus)

Abstract

In this study, quaternized poly (arylene ether sulfone) (QNPAES) was synthesized using conventional nucleophilic aromatic polycondensation. We then developed a blended membrane composed of sulfonated poly (ether ether ketone) (SPEEK) using facile solution casting. A series of mixed hybrid membranes of SPEEK/QNPAES were prepared by varying the wt% of QNPAES mixed with SPEEK. The results showed that an appropriate amount of QNPAES (i.e., 6 wt%) could significantly improve the mechanical strength, proton conductivity and physicochemical properties of a prepared mixed membrane, as well as the proton exchange membrane fuel cell (PEMFC) performance and durability at relative humidity (RH) of 20%. Specifically, a SPEEK/QNPAES at 6 wt% provides a current output, power output and endurance of 0.431 A cm−2, 0.15 W cm−2 and over 900 h, respectively, at an RH of 20% and 60 °C. These results can be attributed to acid-base ionic crosslinking, which offers effective interfacial compatibility between SPEEK and QNPAES. A PEMFC with SPEEK/QNPAES membranes when used at 20% RH achieved significantly advanced performance and ultra-high, long-term durability compared with those of PEMFCs with bare SPEEK, suggesting that SPEEK/QNPAES membranes can be used as polymer electrolyte membranes.
Original languageEnglish
Article number110558
Number of pages14
JournalComposites Part B: Engineering
Volume254
Early online date23 Jan 2023
DOIs
Publication statusPublished - 1 Apr 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Funder

This research was supported by Basic Science Research through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2021R1I1A1A01050905). This work was supported by grants from the Medical Research Center Program (NRF‐2017R1A5A2015061) through the National Research Foundation (NRF), which is funded by the Korean government (MSIP). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2020R1A2B5B01001458).

Keywords

  • SPEEK
  • QNPAES
  • Acid-base crosslinking
  • PEMFC
  • Long-term durability

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