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

Alternative Title
Nanocomposite membranes of surface-sulfonated titanate and Nafion (R) for direct methanol fuel cells
Author(s)
Rhee, Chang HounKim, YoungkwonLee, Jae SungKim, Hae KyungChang, Hyuk
Issued Date
2006-09
DOI
10.1016/j.jpowsour.2005.12.006
URI
https://scholarworks.unist.ac.kr/handle/201301/13162
Fulltext
http://www.sciencedirect.com/science/article/pii/S037877530501671X
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
Publisher
ELSEVIER SCIENCE BV
ISSN
0378-7753
Keyword (Author)
sulfonic acid groupsnafionnanocomposite membranesmethanol crossoverdirect methanol fuel cells
Keyword
LAYERED ZIRCONIUM PHOSPHONATESSOL-GEL CHEMISTRYAC CONDUCTIVITYPROTONIC CONDUCTIVITYCOMPOSITE MEMBRANESHYBRID MEMBRANESWATER-VAPORPHOSPHATEOXIDATION100-200-DEGREES-C

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