Enhanced chemical durability of polymer electrolyte membrane fuel cells by crown ether grafted carbon nanotube

Keun Hwan Oh, Youngmo Goo, Myounghwan Kim, Jiyoung Park, Kwan Woo Nam, Heejin Kim

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Low chemical stability of membrane-electrode assembly (MEA) remains a major obstacle to commercialization of polymer electrolyte membrane fuel cells (PEMFCs) for fuel cell electric vehicles (FCEVs). In this study, we doubly anchored cerium-ion in the catalyst layer by forming a complex with the 15-crown-5-ether and additionally grafting to the multiwall carbon nanotube (Ce/CRE-graft-CNT) as a long-lasting radical scavenger. To confirm the effect of Ce/CRE-graft-CNT on chemical durability, the binding energy between the cerium-ion and crown ether was identified with DFT calculations. The incorporation of Ce/CRE-graft-CNT into catalyst layer decreases decay rate of open circuit voltage (OCV) by 4 times from 2.13 to 0.56 mV h−1 for 210 h operation. The performance retention of the Ce/CRE-graft-CNT (70.8 %) at 0.6 V is also higher than that of the Ce/CRE-blend-CNT (44.8 %). The results indicate that the doubly anchored Ce/CRE-graft-CNT has a more retention capability as a radical scavenger. Therefore, a tightly bounded cerium-ion/crown ether complex with CNT can provide a strategy to improve the chemical durability of MEAs.

Original languageEnglish
Article number167227
JournalJournal of Alloys and Compounds
Volume928
DOIs
StatePublished - 20 Dec 2022

Bibliographical note

Funding Information:
This work was supported by the Technology Innovation Program ( 1415179321/20012133 ) funded by the Ministry of Trade, Industry & Energy ( MOTIE , Korea) and the Korea Evaluation Institute of Industrial Technology ( KEIT ), and the Korea Research Institute of Chemical Technology ( KRICT ) Core Research Program (KS2222-10 ). H. Kim acknowledges the financial support of the Korea Basic Science Institute ( C230110 ).

Publisher Copyright:
© 2022 The Authors

Keywords

  • Carbon nanotube
  • Cerium ion
  • Crown ether
  • Polymer electrolyte membrane fuel cell
  • Radical scavenger

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