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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Nanocomposite membranes of surface-sulfonated titanate and Nafion (R) for direct methanol fuel cells

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Title
Nanocomposite membranes of surface-sulfonated titanate and Nafion (R) for direct methanol fuel cells
Other Titles
Nanocomposite membranes of surface-sulfonated titanate and Nafion (R) for direct methanol fuel cells
Author
Rhee, Chang HounKim, YoungkwonLee, Jae SungKim, Hae KyungChang, Hyuk
Keywords
sulfonic acid groups; nafion; nanocomposite membranes; methanol crossover; direct methanol fuel cells
Issue Date
2006-09
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.159, no.2, pp.1015 - 1024
Abstract
Various thiol and sultone groups were grafted onto the surface of titanate nanosheets to render organic sulfonic acid (HSO3-) functionality. The nanocomposite membranes were cast together with Nation (R) using these materials as inorganic fillers. Nanocomposite membranes containing surface-sulfonated titanates showed higher proton conductivity than composite membranes containing untreated TiO2 P25 particles. They showed better mechanical and thermal stability than Nafion alone. The methanol permeability of nanocomposite membranes decreased with increasing the content of the sulfonated titanate in the nanocomposite membranes. The relative permeability of methanol through these composite membranes with 2 and 5 M methanol solutions was reduced by up to 38 and 26%, respectively, relative to pristine Nafion 115 membranes. The membrane electrode assembly using Nafion/sulfonated titanate nanocomposite membranes exhibited up to 57% higher power density than the assembly containing a pristine Nafion membrane under typical operating conditions of direct methanol fuel cells. (c) 2005 Elsevier B.V. All rights reserved
URI
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DOI
10.1016/j.jpowsour.2005.12.006
ISSN
0378-7753
Appears in Collections:
ECHE_Journal Papers
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