期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 797, 期 -, 页码 107-112出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2017.05.023
关键词
Oxidized g-C3N4; SPEEK membrane; Proton conduction; Vanadium redox flow battery
资金
- National Natural Science Foundation of China (NSFC) [21306119, 51602209]
- Provincial Nature Science Foundation of Sichuan [2017CC0017, 2013FZ034, 2013JY0150, 2016GZ0423]
- Outstanding Young Scientist Foundation of Sichuan University [2013SCU04A23]
A novel oxidized g-C3N4 (OCN)-modified Sulfonated poly(ether ether ketone) (SPEEK) composite membrane were fabricated via a solution-casting method. The physicochemical properties of composite membranes with different oxidized-C3N4 content were characterized, including water uptake, swelling ratio, ion exchange capacity, proton conductivity, vanadium ion permeability and ion selectivity. It was found that when the content of OCN incorporated into SPEEK matrix was 1%, this composite membrane showed a low vanadium ion permeability(9.09 x 10(-7) cm(2) min(-1)) and high ion selectivity(6.60 x 10(4) S min cm(-3)). The vanadium redox flow battery (VRB) assembled with this membrane at 60 mA cm(-2) exhibited a higher coulombic efficiency (98%) than Nafion 117 membrane (95%). Moreover, in cycling tests VRB assembled with this composite membrane showed a more stable cycle performance compared with that of Nafion 117 membrane. Thus, the OCN-modified SPEEK composite membrane has a potential application for VRB system.
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