Constructing Ionic Liquid-Filled Proton Transfer Channels within Nanocomposite Membrane by Using Functionalized Graphene Oxide

• DOI: 10.1021/acsami.5b09642
• Publication Date: 2015-12-14T23:24:52Z
• Authors: Wenjia Wu; Yifan Li; Pingping Chen; Jindun Liu; Jingtao Wang; Haoqin Zhang
• Keywords: 02 engineering and technology; 540; 0210 nano-technology; 620

Herein, nanocomposite membranes are fabricated based on functionalized graphene oxides (FGOs) and sulfonated poly(ether ether ketone) (SPEEK), followed by being impregnated with imidazole-type ionic liquid (IL). The functional groups (acidic group or basic group) FGOs generate strong interfacial interactions SPEEK chains then adjust their motion stacking. As a result, the possess tunable domains as determined its free volume characteristic, which provides regulated location for IL storage. stored ILs act hopping sites water-free proton conduction along FGO-constructed channels. microstructure at SPEEK-FGO interface governs uptake distribution in membrane. Different from GO vinyl imidazole (VGO), presence of acidic (−SO3H) confers p-styrenesulfonic acid (SGO) incorporated membrane loose electrostatic attraction IL, imparting an enhanced anhydrous conductivity. Nanocomposite containing 7.5% SGO attains maximum 73.7% hence conductivity 21.9 mS cm–1 150 °C, more than 30 times that control (0.69 cm–1). In addition, SGOs attractions to confined within SGO-SPEEK interface, affording retention ability.