气候变化领域集成服务门户(CCPortal): Holey aligned electrodes through in-situ ZIF-8-assisted-etching for high-performance aqueous redox flow batteries

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DOI	10.1016/j.scib.2020.12.019
	Holey aligned electrodes through in-situ ZIF-8-assisted-etching for high-performance aqueous redox flow batteries
	Sun J.; Jiang H.; Zhao C.; Fan X.; Chao C.; Zhao T.
发表日期	2020
ISSN	20959273
英文摘要	Fabricating electrodes with large specific surface area (SSA) and high permeability has been the long-standing target in redox flow batteries (RFBs). In this work, we propose a novel ZIF-8-assisted etching approach to form holey fibers in the electrospinning process of aligned electrode structures. The etching approach allows the formation of holey fibers with small pores of ~50 nm, offering large active surface areas for redox reactions, while the aligned macrostructure with the holey fibers of 3–5 μm in diameter ensures a high permeability along the fiber direction. The application of the prepared electrodes to a vanadium redox flow battery (VRFB) enables an energy efficiency (EE) of 87.2% at the current density of 200 mA cm−2, which is 13.3% higher than that with conventional electrospun carbon electrodes. Even at high current densities of 300 and 400 mA cm−2, the battery still maintains energy efficiencies of 83.3% and 79.3%. More excitingly, the prepared electrode yields a high limiting current density of 4500 mA cm−2 and a peak power density of 1.6 W cm−2. It is anticipated that the present electrospinning method combining the ZIF-8-assisted etching approach with a way to form ordered fiber structures will allow even more high-performance electrodes for RFBs in the future. © 2020 Science China Press
关键词	Aligned structure Electrospinning High-performance electrodes Holey fiber Redox flow battery ZIF-8
英文关键词	Current density; Electrodes; Electrospinning; Energy efficiency; Etching; Fibers; Holey fibers; Redox reactions; Surface reactions; Electrode structure; Electrospinning method; Electrospinning process; High current densities; Large specific surface areas; Limiting current density; Peak power densities; Vanadium redox flow batteries; Flow batteries
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207181
作者单位	Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong; Building Energy Research Center, Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou, 511458, China; Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong
推荐引用方式 GB/T 7714	Sun J.,Jiang H.,Zhao C.,et al. Holey aligned electrodes through in-situ ZIF-8-assisted-etching for high-performance aqueous redox flow batteries[J],2020.
APA	Sun J.,Jiang H.,Zhao C.,Fan X.,Chao C.,&Zhao T..(2020).Holey aligned electrodes through in-situ ZIF-8-assisted-etching for high-performance aqueous redox flow batteries.Science Bulletin.
MLA	Sun J.,et al."Holey aligned electrodes through in-situ ZIF-8-assisted-etching for high-performance aqueous redox flow batteries".Science Bulletin (2020).