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论文类型：期刊论文

发表时间：2020-11-30

发表刊物：JOURNAL OF POWER SOURCES

卷号：477

ISSN号：0378-7753

关键字：Anion exchange membrane; Pyridine; Adamantane; Poly (aryl ether ketone); Vanadium redox flow battery

摘要：High-performance membranes are crucial components for high power density, durable vanadium redox flow battery (VRFB). Many cost-effective membranes with high conductivity and good ion selectivity have been developed, but most of these membranes have inadequate stability. To rectify this situation, a new pyridinium functionalized, 2-adamantane containing poly (aryl ether ketone) (Py2-ADMPEK) membranes with high battery performance and excellent stability are developed. Positively charged pyridinium groups are introduced into the rigid, hydrophobic and low swelling adamantane containing backbone. Consequently, the resulting Py2-ADMPEK membrane with a high ion exchange capacity of 2.59 mmol g(-1) exhibits water swelling of only 14.5% and low area resistance (0.17 Omega cm(2)) close to that of Nafion 212 membrane (0.13 Omega cm(2))). Furthermore, the Py2-ADMPEK membranes benefit from their limited swelling and the Donnan effect, that produce good selectivity and excellent stability. A VRFB containing a Py2-ADMPEK membrane exhibit very promising battery performance (coulombic efficiency of 98.3%, voltage efficiency of 89.7% and energy efficiency of 88.2% at 80 mA cm(-2)). Moreover, the Py2-ADMPEK membrane exhibit stable battery performance (more than 2000 cycles at 120 mA cm(-2)) and excellent chemical stability.