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Functionalized titania nanotube composite membranes for high temperature proton exchange membrane fuel cells

✍ Scribed by Yu Jun; Hadis Zarrin; Michael Fowler; Zhongwei Chen

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
949 KB
Volume
36
Category
Article
ISSN
0360-3199

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✦ Synopsis

In this study, functionalized titania nanotubes (F-TiO 2 -NT) were synthesized by using 3mercaptopropyl-tri-methoxysilane (MPTMS) as a sulfonic acid functionalization agent.

These F-TiO 2 -NT were investigated for potential application in high temperature hydrogen polymer electrolyte membrane fuel cells (PEMFCs), specifically as an additive to the proton exchange membrane. Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) results confirmed that the sulfonic acid groups were successfully grafted onto the titania nanotubes (TiO 2 -NT). F-TiO 2 -NT showed a much higher conductivity than non-functionalized titania nanotubes. At 80 C, the conductivity of F-TiO 2 -NT was 0.08 S/cm, superior to that of 0.0011 S/cm for the non-functionalized TiO 2 -NT. The F-TiO 2 -NT/Nafion composite membrane shows good proton conductivity at high temperature and low humidity, where at 120 C and 30% relative humidity, the proton conductivity of the composite membrane is 0.067 S/cm, a great improvement over 0.012 S/cm for a recast Nafion membrane. Based on the results of this study, F-TiO 2 -NT has great potential for membrane applications in high temperature PEMFCs.

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