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Effects of cesium-substituted silicotungstic acid doped with polybenzimidazole membrane for the application of medium temperature polymer electrolyte fuel cells

机译:聚苯并咪唑膜掺杂铯取代的硅钨酸在中温聚合物电解质燃料电池中的应用效果

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Inorganic-organic composite membranes were prepared by using partly cesium-substituted silicotungstic acid (CHS-WSiA) and polybenzimidazole (PBI, MRS0810H) for medium temperature polymer electrolyte fuel cells (MT-PEFCs). Cesium hydrogen sulfate (CsHSO_(4), CHS) and silicotungstic acid (H_(4)SiW_(12)O_(40), WSiA) were milled to obtain 0.5CHS-0.5WSiA composites by dry and wet mechanical millings. N,Ndimethylacetamide (DMAc) was used as a disperse medium in the preparation of the inorganic solid acids by wet mechanical milling and also a casting agent for fabrication of membrane. Finally, flexible and homogeneous composite membranes with several phosphoric acid doping levels (PADLs) were obtained. The wet mechanical milling using DMAc was found to effectively promote good substitution of H~(+)ion in WSiA by Cs~(+)ion of CHS and promoted the formation of smaller grain sizes of composites, compared with dry milling. A high maximum power density of 378 mWcm~(-2)and a good constant current stability test were obtained from a single cell test using the PBI composite membrane containing 20 wt% of 0.5CHS-0.5WSiA from wet milling and phosphoric acid doping level (PADL) of 8 mol, at 150 °C under an anhydrous condition. Wet milling CHS-WSiA crystallites were highly dispersed in PBI to give homogenized membranes and played a significant role in the enhancemance of acidity by increasing the number of proton sites in the electrolyte membrane. After the addition of CHS-WSiA into PBI membrane, the acid and water retention properties were improved and incorporated as new proton conduction path by adsorbing phosphoric acid in these composite electrolyte membranes. These observations suggest that composite membranes with 8 mol of PADL are good promising PA dopedmembranes with effective electrochemical properties for the medium temperature fuel cells.
机译:通过使用部分铯取代的硅钨酸(CHS-WSiA)和聚苯并咪唑(PBI,MRS0810H)制备用于中温聚合物电解质燃料电池(MT-PEFC)的无机-有机复合膜。通过干法和湿法机械研磨将硫酸氢铯(CsHSO_(4),CHS)和硅钨酸(H_(4)SiW_(12)O_(40),WSiA)研磨以获得0.5CHS-0.5WSiA复合材料。在通过湿式机械研磨制备无机固体酸时,将N,N二甲基乙酰胺(DMAc)用作分散介质,并用于制造膜的浇铸剂。最后,获得具有几种磷酸掺杂水平(PADL)的柔性且均质的复合膜。与干磨相比,发现使用DMAc的湿式机械研磨可有效地促进WSiA中的H〜(+)离子被CHS的Cs〜(+)离子良好取代,并促进形成更小的晶粒尺寸的复合材料。使用包含20 wt%的0.5CHS-0.5WSiA的PBI复合膜通过湿磨和磷酸掺杂水平从单电池测试中获得了378 mWcm〜(-2)的高最大功率密度和良好的恒定电流稳定性测试(PADL)为8摩尔,在无水条件下于150°C。湿磨CHS-WSiA微晶高度分散在PBI中,得到均质的膜,并通过增加电解质膜中的质子位点在酸度的增强中起重要作用。将CHS-WSiA添加到PBI膜中后,酸和保水性能得到改善,并通过在这些复合电解质膜中吸附磷酸而作为新的质子传导路径并入。这些观察结果表明,具有8mol PADL的复合膜是良好的有前途的PA掺杂膜,其对于中温燃料电池具有有效的电化学性能。

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