Covalent triazine frameworks crosslinked microporous polymer membranes with fast and selective ion transport for ultra-stable vanadium redox flow batteries

doi:10.1016/j.cej.2024.155068

IMR OpenIR

	Covalent triazine frameworks crosslinked microporous polymer membranes with fast and selective ion transport for ultra-stable vanadium redox flow batteries
	Qi, Meijuan 1,2; Yan, Hui 1; Wei, Wei 1; Tang, Ao 1
通讯作者	Wei, Wei(weiwei@imr.ac.cn) ; Tang, Ao(a.tang@imr.ac.cn)
	2024-10-01
发表期刊	CHEMICAL ENGINEERING JOURNAL
ISSN	1385-8947
卷号	497 页码:10
摘要	The vanadium redox flow batteries (VRFBs) are an essential pathway to long-duration energy storage with the merits of power and energy decoupling, long lifetime and safety. However, low coulombic efficiency stemming from vanadium crossover across the membrane together with notable ohmic loss originated from low proton conductivity of the membrane still limits high performance operation of the VRFBs. Herein, we proposed 2,2 ' bipyridine-based covalent triazine frameworks (bipCTF) crosslinked sulfonated-poly (4,4 '-diphenylether-5,5 ' bibenzimidazole) (SOPBI) (bipCTF/SP-100) for use as the membrane in VRFBs, which synergistically prevents vanadium crossover and enhances proton conductivity. By delicately tuning the sulfonation degree and properly incorporate bipCTF, the bipCTF/SP-100 membrane is successfully synthesized based on OPBI polymers, which delivers a reduced area resistance of 0.3 Omega cm2 and a low VO2+ permeability of 19.05 x 10-9 cm2 s- 1, affording an excellent trade-off between proton conductivity and ion selectivity. Theoretical calculation further corroborates that the high proton conductivity of bipCTF/SP-100 is attributed to the ionic channels formed by bipCTF, while the superior ion selectivity is assigned to protonated imidazole and pyridine. Benefiting from microporous bipCTF/SP-100 membrane, the VRFB exhibits a high CE of 99.8 % and an excellent EE of 78.3 % at 250 mA cm- 2 and meanwhile yields a high capacity retention of 94.8 % after 200 cycles at 200 mA cm- 2, which shows enormous potential for high power density operation of the VRFBs.
关键词	Covalent triazine frameworks SOPBI membrane Ionic channel Ion-selectivity Vanadium flow battery
资助者	National Key R & D Pro-gram of China
DOI	10.1016/j.cej.2024.155068
收录类别	SCI
语种	英语
资助项目	National Key R & D Pro-gram of China[2022YFB2404901]
WOS研究方向	Engineering
WOS类目	Engineering, Environmental ; Engineering, Chemical
WOS记录号	WOS:001301721100001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/189386
专题	中国科学院金属研究所
通讯作者	Wei, Wei; Tang, Ao
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou 215123, Peoples R China
推荐引用方式 GB/T 7714	Qi, Meijuan,Yan, Hui,Wei, Wei,et al. Covalent triazine frameworks crosslinked microporous polymer membranes with fast and selective ion transport for ultra-stable vanadium redox flow batteries[J]. CHEMICAL ENGINEERING JOURNAL,2024,497:10.
APA	Qi, Meijuan,Yan, Hui,Wei, Wei,&Tang, Ao.(2024).Covalent triazine frameworks crosslinked microporous polymer membranes with fast and selective ion transport for ultra-stable vanadium redox flow batteries.CHEMICAL ENGINEERING JOURNAL,497,10.
MLA	Qi, Meijuan,et al."Covalent triazine frameworks crosslinked microporous polymer membranes with fast and selective ion transport for ultra-stable vanadium redox flow batteries".CHEMICAL ENGINEERING JOURNAL 497(2024):10.