▎ 摘　　要

Sulfonated poly(ether ether ketone) (SPEEK) hybrid membranes are prepared by incorporating 2,2'-benzidinedisulfonic acid-functionalized amphoteric graphene oxide (GO-BDSA) nanosheets. The optimized membrane permeability and ion selectivity greatly regulate the vanadium flow redox battery (VRFB) performance in terms of the formed interfacial action. At a 1 wt % loading of GO-BDSA nanosheets, proton conductivity and ion selectivity of SPEEK/GO-BDSA-1 reach a maximum value such as 30.7 mS cm(-1) and 43.3 X 10(3) S min cm(-3), respectively. As compared with the self-discharge time of SPEEK (38 h) and Nafion 117 (33.5 h), SPEEK/GO-BDSA-1 hybrid membrane shows a longer one, 95.3 h. In the meantime, higher voltage efficiency (VE, 92%) and energy efficiency (EE, 85%) than those of SPEEK (VE, 87% and EE, 82%) and Nafion 117 (VE, 89% and EE, 84%) are confirmed at 50 mA.cm(-2). The structure stability and durability of SPEEK/GO-BDSA-I hybrid membrane are supposed after 250-time charge-discharge test, which is ascribed to the interaction of GO-BDSA nanosheets and SPEEK matrix. So, SPEEK/GO-BDSA hybrid membranes demonstrate a promising prospect for VRFB as the proton exchange membrane.