开发用于直接甲醇燃料电池的铯磷钨酸盐盐和壳聚糖复合膜。

Development of cesium phosphotungstate salt and chitosan composite membrane for direct methanol fuel cells.

机构信息

Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing, 100191, PR China.

出版信息

Carbohydr Polym. 2013 Oct 15;98(1):233-40. doi: 10.1016/j.carbpol.2013.06.017. Epub 2013 Jun 20.

DOI:10.1016/j.carbpol.2013.06.017

PMID:23987340

Abstract

A novel composite membrane has been developed by doping cesium phosphotungstate salt (CsxH3-xPW12O40 (0≤x≤3), Csx-PTA) into chitosan (CTS/Csx-PTA) for application in direct methanol fuel cells (DMFCs). Uniform distribution of Csx-PTA nanoparticles has been achieved in the chitosan matrix. The proton conductivity of the composite membrane is significantly affected by the Csx-PTA content in the composite membrane as well as the Cs substitution in PTA. The highest proton conductivity for the CTS/Csx-PTA membranes was obtained with x=2 and Cs2-PTA content of 5 wt%. The value is 6×10(-3) S cm(-1) and 1.75×10(-2) S cm(-1) at 298 K and 353 K, respectively. The methanol permeability of CTS/Cs2-PTA membrane is about 5.6×10(-7), 90% lower than that of Nafion-212 membrane. The highest selectivity factor (φ) was obtained on CTS/Cs2-PTA-5 wt% composite membrane, 1.1×10(4)/Scm(-3)s. The present study indicates the promising potential of CTS/Csx-PTA composite membrane as alternative proton exchange membranes in direct methanol fuel cells.

摘要

一种新型复合膜通过掺杂铯磷钨酸盐盐（CsxH3-xPW12O40（0≤x≤3），Csx-PTA）到壳聚糖（CTS/Csx-PTA）中应用于直接甲醇燃料电池（DMFCs）。Csx-PTA 纳米粒子在壳聚糖基质中均匀分布。复合膜的质子电导率显著受复合膜中 Csx-PTA 含量以及 PTA 中 Cs 取代的影响。CTS/Csx-PTA 膜的最高质子电导率在 x=2 和 Cs2-PTA 含量为 5wt%时获得。在 298K 和 353K 时，其值分别为 6×10(-3) S cm(-1)和 1.75×10(-2) S cm(-1)。CTS/Cs2-PTA 膜的甲醇渗透率约为 5.6×10(-7)，比 Nafion-212 膜低 90%。在 CTS/Cs2-PTA-5wt%复合膜上获得了最高的选择性因子（φ），为 1.1×10(4)/Scm(-3)s。本研究表明 CTS/Csx-PTA 复合膜作为直接甲醇燃料电池中质子交换膜的替代材料具有广阔的应用前景。