期刊
JOURNAL OF POWER SOURCES
卷 196, 期 11, 页码 4934-4942出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.02.017
关键词
Sulfonated titania submicrosphere; Sulfonated poly(ether ether ketone); Hybrid membrane; Direct methanol fuel cell; Methanol permeability; Proton conductivity
资金
- National Nature Science Foundation of China [20776101]
- Programme of Introducing Talents of Discipline to Universities [B06006]
- Ministry of Education of China
- SRF for ROCS, State Education Ministry
Sulfonated titania submicrospheres (TiO2-SO3 H) prepared through a facile chelation method are incorporated into sulfonated poly(ether ether ketone) (SPEEK) to fabricate organic-inorganic hybrid membranes with enhanced proton conductivity and reduced methanol permeability for potential use in direct methanol fuel cells (DMFCs). The pristine titania submicrospheres (TiO2) with a uniform particle size are synthesized through a modified sol-gel method and sulfonated using 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt as the sulfonation reagent. The sulfonation process is confirmed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS). The hybrid membranes are systematically characterized in terms of thermal property, mechanical property, ionic exchange capacity (IEC), swelling behavior, and microstructural features. The methanol barrier property and the proton conductivity of the SPEEK/TiO2-SO3H hybrid membranes are evaluated. The presence of the fillers reduces methanol crossover through the membrane. Compared with the unsulfonated TiO2-doped membranes, the TiO2-SO3 H-doped ones exhibit higher proton conductivity due to the additional sulfonic acid groups on the surface of TiO2. The hybrid membrane doped with 15 wt.% TiO2-SO3H submicrospheres exhibits an acceptable proton conductivity of 0.053 S cm(-1) and a reduced methanol permeability of 4.19 x 10(-7) cm(2) s(-1). (C) 2011 Elsevier B.V. All rights reserved.
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