气候变化领域集成服务门户(CCPortal): Activating the I/I+redox couple in an aqueous I2-Zn battery to achieve a high voltage plateau

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DOI	10.1039/d0ee03086d
	Activating the I/I+redox couple in an aqueous I2-Zn battery to achieve a high voltage plateau
	Li X.; Li M.; Huang Z.; Liang G.; Chen Z.; Yang Q.; Huang Q.; Zhi C.
发表日期	2021
ISSN	17545692
起始页码	407
结束页码	413
卷号	14 期号:1
英文摘要	Rechargeable iodine conversion batteries possess promising prospects for portable energy storage with complete electron transfer and rich valence supply. However, the reaction is limited to the single I-/I redox at a potential of only 0.54 V vs. the standard hydrogen electrode (SHE), leading to a low voltage plateau at 1.30 V when Zn is employed as the anode. Herein, we show how to activate the desired reversible I/I+ redox behavior at a potential of 0.99 V vs. SHE by electrolyte tailoring via F- and Cl- ion-containing salts. The electronegative F- and Cl- ions can stabilize the I+ during charging. In an aqueous Zn ion battery based on an optimized ZnCl2 + KCl electrolyte with abundant Cl-, the I-terminated halogenated Ti3C2I2 MXene cathode delivered two well-defined discharge plateaus at 1.65 V and 1.30 V, superior to all reported aqueous I2-metal (Zn, Fe, Cu) counterparts. Together with the 108% capacity enhancement, the high voltage output resulted in a significant 231% energy density enhancement. Metallic Ti3C2I2 benefits the redox kinetics and confines the interior I species, leading to exceptional cyclic durability and rate capability. In situ Raman and ex situ multiple spectral characterizations clarify the efficient activation and stabilization effects of Cl- (F-) ions on reversible I/I+ redox. Our work is believed to provide new insight into designing advanced I2-metal batteries based on the newly discovered I-/I/I+ chemistry to achieve both high voltage and enhanced capacity. © The Royal Society of Chemistry.
英文关键词	Chemical activation; Chlorine compounds; Electrodes; Electrolytes; Electron transport properties; Energy storage; Ions; Secondary batteries; Spectrum analyzers; Titanium compounds; Zinc; Zinc chloride; Capacity enhancement; Cyclic durability; Electron transfer; Low-voltage plateau; Rate capabilities; Spectral characterization; Stabilization effects; Standard hydrogen electrodes; Potassium compounds; aqueous solution; durability; electrode; electrolyte; energy storage; fuel cell; redox conditions
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/190823
作者单位	Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, 999077, Hong Kong; Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo Zhejiang, 315201, China; Centre for Functional Photonics, City University of Hong Kong, Kowloon, 999077, Hong Kong; Center for Advanced Nuclear Safety and Sustainable Development, City University of Hong Kong, Kowloon, 999077, Hong Kong
推荐引用方式 GB/T 7714	Li X.,Li M.,Huang Z.,et al. Activating the I/I+redox couple in an aqueous I2-Zn battery to achieve a high voltage plateau[J],2021,14(1).
APA	Li X..,Li M..,Huang Z..,Liang G..,Chen Z..,...&Zhi C..(2021).Activating the I/I+redox couple in an aqueous I2-Zn battery to achieve a high voltage plateau.Energy & Environmental Science,14(1).
MLA	Li X.,et al."Activating the I/I+redox couple in an aqueous I2-Zn battery to achieve a high voltage plateau".Energy & Environmental Science 14.1(2021).