Nafion membranes with a porous surface

Quoc Khanh Dang, Dirk Henkensmeier, N. Nambi Krishnan, Jong Hyun Jang, Hyoung Juhn Kim, SukWoo Nam, Tae Hoon Lim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Nafion membranes with a monolayer of pores on one surface (P-Nafion) were prepared by casting a Nafion SE20092 dispersion containing ortho-dichlorobenzene. The pores are not connected but provide 2μm large openings, increasing the membrane surface by one dimension. The thickness of the porous layer is typically <5μm. In catalyst coated membranes the catalyst layer penetrated the pores well. The effect on the performance of a polymer electrolyte fuel cell (PEFC) was investigated at 95°C. The porous layer formed the cathode, to enhance water back diffusion. After 24h equilibration, 30-35μm thick P-Nafion gave 10-16% higher current density, reaching 858mA/cm2 at 0.4V and 50% rh. N211 and P-Nafion equilibrated for 8min showed peak power densities of 56 and 208mW/cm2 under anhydrous conditions, respectively, indicating that drying processes are slowed down. The stability of a MEA was tested for 240h at 0.4V and 50% rh (anode/cathode), without observable degradation. Under fully humidified conditions, the electrochemical surface area (ECSA) increased 40% in comparison to a N211 based MEA. At 65°C, the ECSA more than doubled, showing 141m2/g Pt. Also influence of the pores on water transport through a membrane and stability against membrane-electrode delamination were considered.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalJournal of Membrane Science
Volume460
DOIs
Publication statusPublished - 2014 Jun 15
Externally publishedYes

Fingerprint

membranes
Membranes
Electrodes
porosity
Cathodes
cathodes
catalysts
Catalysts
Water
Delamination
water
Electrolytes
drying
fuel cells
high current
radiant flux density
Fuel cells
Monolayers
Drying
Anodes

Keywords

  • Fuel cells
  • Hierarchical structures
  • Nafion membranes
  • Porous surfaces
  • Water management

ASJC Scopus subject areas

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

Cite this

Dang, Q. K., Henkensmeier, D., Krishnan, N. N., Jang, J. H., Kim, H. J., Nam, S., & Lim, T. H. (2014). Nafion membranes with a porous surface. Journal of Membrane Science, 460, 199-205. https://doi.org/10.1016/j.memsci.2014.03.003

Nafion membranes with a porous surface. / Dang, Quoc Khanh; Henkensmeier, Dirk; Krishnan, N. Nambi; Jang, Jong Hyun; Kim, Hyoung Juhn; Nam, SukWoo; Lim, Tae Hoon.

In: Journal of Membrane Science, Vol. 460, 15.06.2014, p. 199-205.

Research output: Contribution to journalArticle

Dang, QK, Henkensmeier, D, Krishnan, NN, Jang, JH, Kim, HJ, Nam, S & Lim, TH 2014, 'Nafion membranes with a porous surface', Journal of Membrane Science, vol. 460, pp. 199-205. https://doi.org/10.1016/j.memsci.2014.03.003
Dang QK, Henkensmeier D, Krishnan NN, Jang JH, Kim HJ, Nam S et al. Nafion membranes with a porous surface. Journal of Membrane Science. 2014 Jun 15;460:199-205. https://doi.org/10.1016/j.memsci.2014.03.003
Dang, Quoc Khanh ; Henkensmeier, Dirk ; Krishnan, N. Nambi ; Jang, Jong Hyun ; Kim, Hyoung Juhn ; Nam, SukWoo ; Lim, Tae Hoon. / Nafion membranes with a porous surface. In: Journal of Membrane Science. 2014 ; Vol. 460. pp. 199-205.
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