期刊
JOURNAL OF POWER SOURCES
卷 259, 期 -, 页码 203-212出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.02.091
关键词
Poly(phosphonic acid)/silica nanotube; Aspect ratio; Sulfonated poly(ether ether ketone); Proton conductivity; Methanol permeability; Mechanical stability
资金
- National Science Fund for Distinguished Young Scholars [21125627]
- National High Technology Research and Development Program of China [2012AA03A611]
- Program of Introducing Talents of Discipline to Universities [B06006]
The objective of this study is to exploit the one-dimension structure and good proton conduction of phosphorylated silica nanotubes for high proton conductivity of proton exchange membrane (PEM). Three types of poly(vinylphosphonic acid-co-divinylbenzene)/silica nanotubes with different aspect ratios are synthesized and incorporated into the sulfonated poly(ether ether ketone) (SPEEK) matrix to prepare composite membranes. The poly(vinylphosphonic acid) segments in the nanotubes could construct facile proton-conduction pathway along this one-dimensional nanostructure. The nanotubes with high aspect ratio exhibit more pronounced effect in elevating the proton conductivity of membranes, revealing the importance of continuity of conduction pathway on proton transport. The membrane incorporated with the nanotubes of the largest aspect ratio of 45.9 exhibits the highest proton conductivity of 0.1032 S cm(-1) at 30 degrees C, 100% RH, which was 84% higher than that of SPEEK control membrane. Moreover, the nanotubes can reduce the methanol permeability, and improve mechanical stability of the membranes. (C) 2014 Elsevier B.V. All rights reserved.
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