Long-term durability of radiation-grafted PFA-g-PSSA membranes for direct methanol fuel cells

Segoo Kang, Doohwan Jung, Junhwa Shin, Seongyop Lim, Sang Kyung Kim, Yong-Gun Shul, Dong Hyun Peck

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether)-graft-poly(styrene sulfonic acid) (PFA-g-PSSA) membranes were prepared by γ-ray radiation-induced grafting of styrene onto 50μm PFA films and a subsequent sulfonation. The properties of the PFA-g-PSSA membranes such as ion exchange capacity, water uptake, proton conductivity, and methanol permeability were evaluated and compared with commercial Nafion 115 membrane. The characteristic properties and direct methanol fuel cell (DMFC) performances with PFA-g-PSSA membrane were better than that with the Nafion 115 membrane. The power density of the single cell with PFA-PSSA30, PFA-PSSA50, PFA-PSSA80 membranes having different degree of grafting (DOG), and Nafion 115 membranes was 113, 123, 118, and 111mWcm-2 at 0.4V, respectively. To study the long-term durability of the prepared membrane electrode assembly (MEA) with a PFA-PSSA50 membrane, the single cell was tested for 2066h in a galvanostatic mode under a constant load 150mAcm-2 and at a temperature of 60°C. The performance loss of the MEA after 2066h operation was about 26.8%. Before and after the long-term performance test, the degradation of MEA with PFA-g-PSSA membrane was investigated by polarization curve technique, electrochemical impedance spectroscopy, TEM, X-ray diffraction, and ion exchange capacity.

Original languageEnglish
Pages (from-to)36-42
Number of pages7
JournalJournal of Membrane Science
Volume447
DOIs
Publication statusPublished - 2013 Nov 5

Fingerprint

Direct methanol fuel cells (DMFC)
durability
fuel cells
Methanol
Durability
methyl alcohol
Radiation
membranes
Membranes
radiation
Electrodes
Styrene
Ion Exchange
assembly
electrodes
Ion exchange
Dielectric Spectroscopy
Sulfonic Acids
Sulfonation
Proton conductivity

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

Kang, Segoo ; Jung, Doohwan ; Shin, Junhwa ; Lim, Seongyop ; Kim, Sang Kyung ; Shul, Yong-Gun ; Peck, Dong Hyun. / Long-term durability of radiation-grafted PFA-g-PSSA membranes for direct methanol fuel cells. In: Journal of Membrane Science. 2013 ; Vol. 447. pp. 36-42.
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Long-term durability of radiation-grafted PFA-g-PSSA membranes for direct methanol fuel cells. / Kang, Segoo; Jung, Doohwan; Shin, Junhwa; Lim, Seongyop; Kim, Sang Kyung; Shul, Yong-Gun; Peck, Dong Hyun.

In: Journal of Membrane Science, Vol. 447, 05.11.2013, p. 36-42.

Research output: Contribution to journalArticle

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T1 - Long-term durability of radiation-grafted PFA-g-PSSA membranes for direct methanol fuel cells

AU - Kang, Segoo

AU - Jung, Doohwan

AU - Shin, Junhwa

AU - Lim, Seongyop

AU - Kim, Sang Kyung

AU - Shul, Yong-Gun

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N2 - Poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether)-graft-poly(styrene sulfonic acid) (PFA-g-PSSA) membranes were prepared by γ-ray radiation-induced grafting of styrene onto 50μm PFA films and a subsequent sulfonation. The properties of the PFA-g-PSSA membranes such as ion exchange capacity, water uptake, proton conductivity, and methanol permeability were evaluated and compared with commercial Nafion 115 membrane. The characteristic properties and direct methanol fuel cell (DMFC) performances with PFA-g-PSSA membrane were better than that with the Nafion 115 membrane. The power density of the single cell with PFA-PSSA30, PFA-PSSA50, PFA-PSSA80 membranes having different degree of grafting (DOG), and Nafion 115 membranes was 113, 123, 118, and 111mWcm-2 at 0.4V, respectively. To study the long-term durability of the prepared membrane electrode assembly (MEA) with a PFA-PSSA50 membrane, the single cell was tested for 2066h in a galvanostatic mode under a constant load 150mAcm-2 and at a temperature of 60°C. The performance loss of the MEA after 2066h operation was about 26.8%. Before and after the long-term performance test, the degradation of MEA with PFA-g-PSSA membrane was investigated by polarization curve technique, electrochemical impedance spectroscopy, TEM, X-ray diffraction, and ion exchange capacity.

AB - Poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether)-graft-poly(styrene sulfonic acid) (PFA-g-PSSA) membranes were prepared by γ-ray radiation-induced grafting of styrene onto 50μm PFA films and a subsequent sulfonation. The properties of the PFA-g-PSSA membranes such as ion exchange capacity, water uptake, proton conductivity, and methanol permeability were evaluated and compared with commercial Nafion 115 membrane. The characteristic properties and direct methanol fuel cell (DMFC) performances with PFA-g-PSSA membrane were better than that with the Nafion 115 membrane. The power density of the single cell with PFA-PSSA30, PFA-PSSA50, PFA-PSSA80 membranes having different degree of grafting (DOG), and Nafion 115 membranes was 113, 123, 118, and 111mWcm-2 at 0.4V, respectively. To study the long-term durability of the prepared membrane electrode assembly (MEA) with a PFA-PSSA50 membrane, the single cell was tested for 2066h in a galvanostatic mode under a constant load 150mAcm-2 and at a temperature of 60°C. The performance loss of the MEA after 2066h operation was about 26.8%. Before and after the long-term performance test, the degradation of MEA with PFA-g-PSSA membrane was investigated by polarization curve technique, electrochemical impedance spectroscopy, TEM, X-ray diffraction, and ion exchange capacity.

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