Self-assembled polyelectrolyte multilayered films on Nafion with lowered methanol cross-over for DMFC applications

Deligoz H., Yilmazturk S., Karaca T., Ozdemir H., Koc S. N., Oksuzomer F., ...More

JOURNAL OF MEMBRANE SCIENCE, vol.326, no.2, pp.643-649, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 326 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1016/j.memsci.2008.10.055
  • Journal Name: JOURNAL OF MEMBRANE SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.643-649
  • Istanbul University Affiliated: Yes

Abstract

The paper is concerned with the deposition of self-assembled polyelectrolyte multilayer on Nafion membrane by layer-by-layer (LbL) technique with lowered methanol cross-over for direct methanol fuel cell (DMFC) applications. The formation of self-assembled multilayered film on Nafion was characterized by UV–vis spectroscopy and it was found that the polyelectrolyte layers growth on the Nafion surface regularly. Furthermore, the proton conductivity and methanol cross-over measurements were carried out for characterization of the LbL self-assembled composite membranes. The results showed that the concentration and pH of the polyelectrolytes significantly affect the proton conductivity and methanol barrier properties of the composite membranes. 10−1 monomol polyelectrolyte concentration and pH 1.8 was found to be optimum deposition conditions considering proton conductivity and methanol permeation properties of the LbL self-assembled composite membranes. The methanol permeability of the 10 bi-layers of PAH1.8/PSS1.8 deposited LbL self-assembly composite membrane was significantly suppressed and found to be 4.41 × 10−7 cm2/s while the proton conductivity value is in acceptable range for fuel cell applications.

The paper is concerned with the deposition of self-assembled polyelectrolyte multilayer on Naflon membrane by layer-by-layer (LbL) technique with lowered methanol cross-over for direct methanol fuel cell (DMFC) applications. The formation of self-assembled multilayered film on Nafion was characterized by UV-vis spectroscopy and it was found that the polyelectrolyte layers growth on the Nafion surface regularly. Furthermore, the proton conductivity and methanol cross-over measurements were carried out for characterization of the LbL self-assembled composite membranes. The results showed that the concentration and pH of the polyelectrolytes significantly affect the proton conductivity and methanol barrier properties of the composite membranes. 10(-1) monomol polyelectrolyte concentration and pH 1.8 was found to be optimum deposition conditions considering proton conductivity and methanol permeation properties of the LbL self-assembled composite membranes. The methanol permeability of the 10 bilayers of PAH1.8/PSS1.8 deposited LbL self-assembly composite membrane was significantly suppressed and found to be 4.41 X 10(-7) cm(2)/s while the proton conductivity value is in acceptable range for fuel cell applications. (C) 2008 Elsevier B.V. All rights reserved.