MIL-101(Cr)-SO3H含量对PEMFC用PES-C质子交换膜性能的影响

Effects of MIL-101(Cr)-SO3H content on properties of PES-C proton exchange membrane for PEMFC

采用水热方法制备得到MIL-101(Cr),经过磺化处理生成含磺酸基的MIL-101(Cr)-SO3H,再将其掺入酚酞侧基聚芳醚砜(PES-C)内,获得PES-C/MIL-101(Cr)-SO3H质子交换膜,测试了PES-C膜的显微组织形态、吸水率及其对质子的传导能力。结果表明,MIL-101(Cr)-SO3H形成了和MIL-101(Cr)相同的特征峰,在磺化反应阶段试样依然保持了完整的晶体结构。制得了具有致密组织的PES-C膜,并且其表面达到了较光滑的状态,添加MIL-101(Cr)-SO3H后的PES-C膜则形成了粗糙表面组织。且随着MIL-101(Cr)-SO3H含量的增加,PES-C膜表面形成了更多MIL-101(Cr)-SO3H颗粒,粗糙程度越发的明显。随着去离子水温度的增加,PES-C膜的吸水率和溶胀度增加,获得了更强传导质子的能力。未添加MIL-101(Cr)-SO3H的PES-C膜达到了最小吸水率,提高MIL-101(Cr)-SO3H填充量后,PES-C膜吸水率持续增大,表现出更强的质子传导能力。

MIL-101(Cr)is prepared by hydrothermal method,and sulfonated into MIL-101(Cr)-SO3H,and finally mixed into phenolphthalide polyaryl ether sulfone(PES-C)to obtain PES-C/MIL-101(Cr)-SO3H proton exchange membrane.The microstructure,water absorption rate and proton conductivity of the prepared PES-C membrane are tested,and the results show that MIL-101(Cr)-SO3H forms the same characteristic peak as MIL-101(Cr),and the sample still maintains a complete crystal structure in the sulfonation reaction stage.The prepared PES-C membrane without MIL-101(Cr)-SO3H owns a dense tissue and a relatively smooth surface.With addition of MIL-101(Cr)-SO3H,the membrane forms a rough surface tissue.Moreover,with the increasing content of MIL-101(Cr)-SO3H,more MIL-101(Cr)-SO3H particles are formed on the membrane surface,and the roughness becomes more obvious.With the rising temperature of deionized water,both water absorption rate and swelling degree of PES-C membrane increases,which can obtain stronger ability to conduct protons.Before MIL-101(Cr)-SO3H is added,PES-C membrane has the minimum water absorption rate.After increasing the adding amount of MIL-101(Cr)-SO3H,the water absorption rate of PES-C membrane continues to increase,showing a stronger proton conduction ability.