Methylated polybenzimidazole and its application as a blend component in covalently cross-linked anion-exchange membranes for DMFC
Methylated polybenzimidazole and its application as a blend component in covalently cross-linked anion-exchange membranes for DMFC
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DOI：
10.1016/j.memsci.2014.04.004
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发表时间：
2014-09-01
影响因子：
9.5
通讯作者：
Kerres, Jochen
中科院分区：
文献类型：
--
作者：
Katzfuss, Anika;Poynton, Simon;Kerres, Jochen
本文介绍了以甲基化聚苯并咪唑（mPBIOO）为基础的新型阴离子交换膜（AEM）的开发、表征及其在直接甲醇燃料电池（DMFC）中的应用。以碳酸二甲酯（DMC）和1，4-二氮杂双环[2.2.2]辛烷（DABCO）为原料，采用温和的甲基化方法制备甲基化PBIO O（mPBIO O）。使用mPBIOO、磺化聚砜（PPSU SO2 Li）、DABCO和二碘丁烷（DIB）实现共价交联AEM的合成。AEM具有大于2.0 meq g（-1）的IEC，这表明高浓度的阴离子交换基团。取决于交联度，甲醇重量吸收达到最大值43%（按质量计），并且所有AEM显示出优异的非原位碱稳定性。在90 ° C下在KOH水溶液（IM）中10天后，IEC、离子电导率和机械稳定性没有显示出显著降低。DMFC的测量表明，当膜被溶剂（二甲基乙酰胺）提取之前集成到燃料电池的性能提高了三倍。使用非Pt催化剂时，最大功率密度为120 mW cm（-2）。(C)2014 Elsevier B. V.保留所有权利，
In the present work, the development and the characterization of new anion exchange membranes (AEMs) based on a methylated polybenzimidazole (mPBIOO) and their application in direct methanol fuel cell (DMFC) are described. For the preparation of methylated PBIOO (mPBIOO), a gentle methylation method was developed by using dimethyl carbonate (DMC) and 1,4-diazabicyclo[2.2.2]octane (DABCO). The synthesis of covalent cross-linked AEMs was achieved using the mPBIOO, sultinated polysulfone (PPSU-SO2Li), DABCO and diiodobutane (DIB). The AEMs had IECs of more than 2.0 meq g(-1), which indicates a high concentration of anion-exchange groups. Depending on the cross-linking degree, the methanol gravimetric uptake reached a maximum of 43% (by mass) and all AEMs showed an excellent ex situ alkaline stability. After 10 d in aqueous KOH (1 M) at 90 degrees C the IECs, ionic conductivities, and mechanical stabilities did not show a significant decrease. DMFC measurements show a performance improvement of a factor of three when the membranes were solvent (dimethylacetamide) extracted before integration into the fuel cell. With the usage of non-Pt catalysts, a maximum power density of 120 mW cm(-2) was achieved. (C) 2014 Elsevier B.V. All rights reserved,