▎ 摘　　要

A series of acid-base hybrid membranes (SPEEK/PANi-GO), composed of sulfonated poly(ether ether ketone) (SPEEK) and polyaniline-functionalized graphene oxide (PANi-GO), have been prepared and applied for vanadium redox flow battery (VRB). The chemical composition and structure for PANi-GO nanosheets and SPEEK/PANi-GO hybrid membranes are in detail characterized. Physicochemical properties such as ion exchange capacity, proton conductivity and vanadium ion permeability are highly based on the loadings of PANi-GO nanofillers. The formed acid-base pairs, originated from -SO3H of SPEEK and -NH group of PANi-GO, decrease the swelling ratio and vanadium ion permeability. Ion selectivity shows a strong dependence upon the PANi-GO content, and it presents a maximum value at 2% loading. VRB performance by SPEEK/PANi-GO-2 hybrid membrane exhibits a higher coulombic efficiency (CE: 98.5%) and energy efficiency (EE: 81.7%) at 30mA cm(-2), as compared with Nafion 117 (CE: 88.9% and EE: 72.5%) and SPEEK membrane (CE: 89.8% and EE: 69%). The self-discharge time with SPEEK/PANi-GO-2 (58h) is longer than that of Nafion 117 membrane (26h), and a good chemical and oxidation stability is well demonstrated after 300 times charge-discharge cycles for SPEEK/PANi-GO-2 hybrid membrane. These SPEEK/PANi-GO hybrid membranes demonstrate a promising application for VRB system.