Ion-Containing Polymer-Grafted Nanoparticles in Ionic Liquids: Implications for Polymer Electrolyte Membranes
Ion-Containing Polymer-Grafted Nanoparticles in Ionic Liquids: Implications for Polymer Electrolyte Membranes
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DOI：
10.1021/acsanm.1c01369
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发表时间：
2021-07
影响因子：
5.9
通讯作者：
Siqi Liu;Di Wu;Pinar Akcora
中科院分区：
文献类型：
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作者：
Siqi Liu;Di Wu;Pinar Akcora
聚合物接枝纳米粒子在设计用于燃料电池、超级电容器或致动器的电解液系统方面具有几个优点。本文研究了在离子液体/共溶剂混合物中，聚甲基丙烯酸甲酯(PMMA)接枝的磁性纳米粒子与聚苯乙烯磺酸(PSS)末端结构域的稳定作用。我们认为与离子液体有关的阴离子和阳离子分别优先与PMMA的甲基和PSS的磺化基团相互作用。这些相互作用可以用来降低聚合物接枝纳米颗粒电解质膜的整体离子电导率和自由移动反离子分布。与磺化量较高、PMMA链较短的PMMA-b-PSS接枝纳米粒子相比，低磺化量、长PMMA链的PMMA-b-PSS接枝纳米粒子在乙腈和1-己基-3-甲基咪唑双(三氟甲基磺酰基)亚胺(HMIM-TFSI)混合物中表现出最高的电导率。
Polymer-grafted nanoparticles offer several advantages in designing electrolyte systems for their uses in fuel cells, supercapacitors, or actuators. In this work, stabilization of poly(methyl methacrylate) (PMMA)-grafted magnetic nanoparticles with polystyrene sulfonate (PSS) end domains in ionic liquid/cosolvent mixtures is presented. We propose that anions and cations pertaining to ionic liquid preferentially interact with the methyl groups of PMMA and the sulfonated groups of PSS, respectively. These interactions can be used to mitigate the whole ionic conductivity and the free mobile counterion distribution in the copolymer-grafted nanoparticle-based electrolyte membranes. PMMA-b-PSS-grafted nanoparticles with low sulfonation amount and long PMMA chains are found to exhibit the highest conductivity in acetonitrile and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI) mixtures compared to the particles with the higher sulfonation amount and shorter PMMA chains.