首页> 外文期刊>Journal of power sources >Proton Conducting Membranes Prepared By Incorporation Of Organophosphorus Acids Into Alcohol Barrier Polymers For Direct Methanol Fuel Cells
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Proton Conducting Membranes Prepared By Incorporation Of Organophosphorus Acids Into Alcohol Barrier Polymers For Direct Methanol Fuel Cells

机译:通过将有机磷酸掺入直接甲醇燃料电池的酒精阻隔聚合物中制备的质子传导膜

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A novel type of DMFC membrane was developed via incorporation of organophosphorus acids (OPAs) into alcohol barrier materials (polyvinyl alcohol/chitosan, PVA/CS) to simultaneously acquire high proton conductivity and low methanol permeability. Three kinds of OPAs including amino trimethylene phos-phonic acid (ATMP), ethylene diamine tetra(methylene phosphonic acid) (EDTMP) and hexamethylene diamine tetra(methylene phosphonic acid) (HDTMP), with different molecular structure and phosphonic acid groups content were added into PVA/CS blends and served the dual functions as proton conductor as well as crosslinker. The as-prepared OPA-doped PVA/CS membranes exhibited remarkably enhanced proton conducting ability, 2-4 times higher than that of the pristine PVA/CS membrane, comparable with that for Nafion~R 117 membrane (5.04 × 10~(-2) S cm~(-1)). The highest proton conductivities 3.58 × 10~(-2),3.51 × 10~(-2) and 2.61 × 10~(-2) S cm~(-1) for ATMP-, EDTMP-and HDTMP-doped membranes, respectively were all achieved at highest initial OPA doping content (23.1 wt.%) at room temperature. The EDTMP-doped PVA/CS membrane with an acid content of 13.9 wt.% showed the lowest methanol permeability of 2.32 × 10~(-7) cm~2 s~(-1) which was 16 times lower than that of Nafion~R117 membrane. In addition, the thermal stability and oxida-tive durability were both significantly improved by the incorporation of OPAs in comparison with pristine PVA/CS membranes.
机译:通过将有机亚磷酸(OPA)掺入醇阻隔材料(聚乙烯醇/壳聚糖,PVA / CS)中,开发出一种新型的DMFC膜,以同时获得高质子传导率和低甲醇渗透率。加入了分子结构和膦酸含量不同的三种OPA,包括氨基三亚甲基膦酸(ATMP),乙二胺四(亚甲基膦酸)(EDTMP)和六亚甲基二胺四(亚甲基膦酸)(HDTMP)。混合成PVA / CS并充当质子导体和交联剂的双重功能。制备的OPA掺杂的PVA / CS膜表现出显着增强的质子传导能力,比原始PVA / CS膜高2-4倍,与Nafion〜R 117膜相比(5.04×10〜(-2 )S cm〜(-1))。掺杂ATMP,EDTMP和HDTMP的膜的最高质子电导率分别为3.58×10〜(-2),3.51×10〜(-2)和2.61×10〜(-2)S cm〜(-1)在室温下,均以最高的初始OPA掺杂含量(23.1重量%)实现了所有这些步骤。酸含量为13.9 wt。%的EDTMP掺杂的PVA / CS膜的最低甲醇渗透性为2.32×10〜(-7)cm〜2 s〜(-1),比Nafion〜低16倍。 R117膜。另外,与原始的PVA / CS膜相比,通过掺入OPA显着改善了热稳定性和氧化耐久性。

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