Citation: NG Chun-Li, ZHOU Yi, YAN Li-Cheng, WEN Sheng, ZHENG Gen-Wen. Properties of SPES/PWA/SiO₂ Composite Proton Exchange Membranes[J]. Acta Physico-Chimica Sinica, ;2010, 26(11): 2967-2974. doi: 10.3866/PKU.WHXB20101124 shu

Properties of SPES/PWA/SiO₂ Composite Proton Exchange Membranes

NG Chun-Li ¹ ,
ZHOU Yi ¹ ,
YAN Li-Cheng ² ,
WEN Sheng ^1,2, ,
ZHENG Gen-Wen ¹

1.
1. Faculty of Chemistry and Materials Science, Xiaogan University, Xiaogan 432000, Hubei Province, P. R. China;
2. Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Received Date: 2 June 2010
Available Online: 8 October 2010
Fund Project: 湖北省自然科学基金(2009CDZ016)资助项目 (2009CDZ016)

Novel sulfonated poly(ether sulfone) (SPES)/phosphotungstic acid (PWA)/silica organic-inorganic composite membranes for application in direct methanol fuel cells (DMFCs) were prepared by doping SiO₂ sol and PWA into SPES matrix. The structure and performance of the obtained membranes were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX), etc. Compared with the pure SPES membrane, SiO₂ and PWA doping led to higher thermal stabilities, a higher glass transition temperature (T_g), and higher water uptake. At 20℃ and a fuel cell operating temperature of 80℃, the tensile strength of all the composite membranes was lower than that of the SPES membrane. However, even when the content of SiO₂ was as high as 20% (w), the composite membrane still possessed a higher strength than a Nafion 112 membrane. The morphology of the composite membranes indicated that SiO₂ and PWA were uniformly distributed throughout the SPES matrix, which may facilitate proton transport. The proton conductivity of the composite membrane (SPES-P-S 15%: 15% (w) SiO₂ and 6% (w) PWA) reached 0.034 S·cm^-1, which was similar to that of the Nafion 112 membrane at room temperature. However, methanol permeation through the SPES-P-S 15% composite membrane decreased dramatically and was only one-seventh that of the Nafion 112 membrane. This excellent selectivity of the SPES/PWA/SiO₂ composite membrane points to its potential use as a promising electrolyte for DMFCs.
- Direct methanol fuel cell,
- Sulfonated poly(ether sulfone),
- SiO₂,
- Phosphotungstic acid,
- Composite membrane
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通讯作者: 陈斌, bchen63@163.com

Properties of SPES/PWA/SiO₂ Composite Proton Exchange Membranes