期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 36, 期 5, 页码 3606-3613出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.12.030
关键词
High Temperature; Proton exchange membrane fuel cell; Silica; Sulfonation; Composite membrane; Nafion
资金
- National High Technology Research and Development Program of China (863 Program) [2007AA05Z131]
- National Natural Science Foundation of China [20206030]
In this paper, an effective method to cover the conductivity loss of Nafion/SiO2 through sulfonation and its mechanism are studied. Nafion/SiO2 composite membranes are prepared via an in-situ sol gel route, and then sulfonated with concentrated sulfuric acid (marked as Nafion/S-SiO2). The effects of the sulfonation on properties of the Nafion/SiO2 composite membrane are investigated. The results show that sulfonation can improve the proton conductivity of the Nafion/SiO2 effectively, though it brings water-uptake loss to the composite membrane to some extent simultaneously. According to the results of FT-IR, UV resonance Raman spectroscopy, Si-29 solid-state MAS NMR and XRD, it's proved that higher conductivity of Nafion/S-SiO2 should be relevant to hydrogen bonds & chemical bonds between SiO2 nano particles and sulfuric acid molecules. While, lower water uptake & swelling ratio should be caused by hydroxyl-elimination on the surface of SiO2 nanoparticles during sulfonation. Single cell tests show that the performance of Nafion/S-SiO2 composite membranes substantially exceeds Nafion/SiO2 at 110 degrees C and 59%RH, and in the initial testing stage no performance reduction is observed. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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