標題: | Sulfonated graphene oxide/Nafion composite membranes for high-performance direct methanol fuel cells |
作者: | Chien, Hung-Chung Tsai, Li-Duan Huang, Chiu-Ping Kang, Chi-yun Lin, Jiunn-Nan Chang, Feng-Chih 應用化學系 Department of Applied Chemistry |
關鍵字: | Nafion;Sulfonated graphene oxide;Methanol crossover;Direct methanol fuel cells |
公開日期: | 17-十月-2013 |
摘要: | An easy and effective method for producing low methanol-crossover membranes is developed by dispersing sulfonated graphene oxide (SGO) into a Nafion matrix. A SGO/Nafion mixture with low SGO content exhibits unique viscosity behavior and allows for better SGO dispersion within the Nafion. After film casting, the composite membranes show lower methanol and water uptakes, a reduced swelling ratio, improved proton conductivity in low relative humidity, and extremely high methanol selectivity, which can be implemented in direct methanol fuel cells (DMFCs). The regular backbone of the composite membrane shows a higher storage modulus, increased a-relaxation (transition temperature), and improved tolerance to pressure during membrane electrode assembly (MEA). The small angle X-ray spectra indicate the shrinkage of the ionic clusters in the composite membranes, which thus reduce methanol crossover. The hybrid membranes applied to DMFCs demonstrate performances superior to that of the commercial Nafion 115 in 1 M and 5 M methanol solutions. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.ijhydene.2013.08.036 http://hdl.handle.net/11536/23301 |
ISSN: | 0360-3199 |
DOI: | 10.1016/j.ijhydene.2013.08.036 |
期刊: | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY |
Volume: | 38 |
Issue: | 31 |
起始頁: | 13792 |
結束頁: | 13801 |
顯示於類別: | 期刊論文 |