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DOI	10.1039/c8ee00977e
	A porphyrin covalent organic framework cathode for flexible Zn-air batteries
	Li B.-Q.; Zhang S.-Y.; Wang B.; Xia Z.-J.; Tang C.; Zhang Q.
发表日期	2018
ISSN	17545692
起始页码	1723
结束页码	1729
卷号	11 期号:7
英文摘要	Flexible and aqueous Zn-air batteries constitute promising next-generation energy storage devices to meet the growing demand for a safe and stable energy supply for flexible displays, wearable electronics, and implantable medical devices. However, their practical applications are severely hindered by the sluggish kinetics of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) at the air cathode. Herein, a porphyrin covalent organic framework (POF) was innovatively designed and applied as a cathode electrocatalyst for flexible Zn-air batteries. Porphyrin active sites were periodically constructed into well-defined two-dimensional (2D) frameworks precisely controlled at the atomic level, and carbon nanotubes (CNTs) served as scaffolds for further morphology regulation. Interwoven into a free-standing, robust, and flexible film, the as-fabricated CNT@POF hybrid demonstrates impressive performance in rechargeable liquid and flexible all-solid-state Zn-air batteries. Specifically, the liquid Zn-air battery with the CNT@POF cathode exhibits a small voltage gap of 0.71 V and outstanding stability for 200 cycles, even better than the noble-metal-based cathode. Flexible all-solid-state Zn-air batteries demonstrate a high energy efficiency of 61.6% at 1.0 mA cm-2 and the flexibility to stably light a red light-emitting diode (LED, 2.0 V) when bent to different degrees. This contribution demonstrates versatile and ingenious strategies for the multiscale regulation of advanced materials for energy electrocatalysis and thereby facilitates their applications in flexible and safe energy storage and conversion. © 2018 The Royal Society of Chemistry.
英文关键词	Biomedical equipment; Carbon nanotubes; Cathodes; Electrocatalysis; Electrocatalysts; Electrolytic reduction; Energy efficiency; Energy storage; Oxygen; Porphyrins; Precious metals; Reaction kinetics; Scaffolds; Secondary batteries; Yarn; Advanced materials; Covalent organic frameworks; Energy storage and conversions; High energy efficiency; Implantable medical devices; Oxygen evolution reaction; Oxygen reduction reaction; Two Dimensional (2 D); Flexible displays; catalysis; catalyst; chemical reaction; drag coefficient; electrode; electronic equipment; energy efficiency; energy storage; high energy environment; porphyrin; two-dimensional modeling
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190195
作者单位	Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
推荐引用方式 GB/T 7714	Li B.-Q.,Zhang S.-Y.,Wang B.,et al. A porphyrin covalent organic framework cathode for flexible Zn-air batteries[J],2018,11(7).
APA	Li B.-Q.,Zhang S.-Y.,Wang B.,Xia Z.-J.,Tang C.,&Zhang Q..(2018).A porphyrin covalent organic framework cathode for flexible Zn-air batteries.Energy & Environmental Science,11(7).
MLA	Li B.-Q.,et al."A porphyrin covalent organic framework cathode for flexible Zn-air batteries".Energy & Environmental Science 11.7(2018).