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DOI	10.1039/c8ee00422f
	Asymmetric polyoxometalate electrolytes for advanced redox flow batteries
	Friedl J.; Holland-Cunz M.V.; Cording F.; Pfanschilling F.L.; Wills C.; McFarlane W.; Schricker B.; Fleck R.; Wolfschmidt H.; Stimming U.
发表日期	2018
ISSN	17545692
起始页码	3010
结束页码	3018
卷号	11 期号:10
英文摘要	Electrochemical storage of energy is a necessary asset for the integration of intermittent renewable energy sources such as wind and solar power into a complete energy scenario. Redox flow batteries (RFBs) are the only type of battery in which the energy content and the power output can be scaled independently, offering flexibility for applications such as load levelling. However, the prevailing technology, the all Vanadium system, comprises low energy and low power densities. In this study we investigate two polyoxometalates (POMs), [SiW12O40]4- and [PV14O42]9-, as nano-sized electron shuttles. We show that these POMs exhibit fast redox kinetics (electron transfer constant k0 ≈ 10-2 cm s-1 for [SiW12O40]4-), thereby enabling high power densities; in addition, they feature multi-electron transfer, realizing a high capacity per molecule; they do not cross cation exchange membranes, eliminating self-discharge through the separator; and they are chemically and electrochemically stable as shown by in situ NMR. In flow battery studies the theoretical capacity (10.7 A h L-1) could be achieved under operating conditions. The cell was cycled for 14 days with current densities in the range of 30 to 60 mA cm-2 (155 cycles). The Coulombic efficiency was 94% during cycling. Very small losses occurred due to residual oxygen in the system. The voltage efficiency (∼65% at 30 mA cm-2) was mainly affected by ohmic rather than kinetic losses. Pathways for further improvement are discussed. © 2018 The Royal Society of Chemistry.
英文关键词	Electron transitions; Oxides; Polyelectrolytes; Solar energy; Cation exchange membranes; Coulombic efficiency; Electrochemical storage; Operating condition; Renewable energy source; Theoretical capacity; Voltage efficiencies; Wind and solar power; Flow batteries; asymmetry; chemical compound; electrochemical method; electrolyte; fuel cell; redox conditions; renewable resource; technological change
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/190090
作者单位	Chemistry-School of Natural and Environmental Sciences, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom; Siemens AG, Corporate Technology, Erlangen, 91058, Germany
推荐引用方式 GB/T 7714	Friedl J.,Holland-Cunz M.V.,Cording F.,et al. Asymmetric polyoxometalate electrolytes for advanced redox flow batteries[J],2018,11(10).
APA	Friedl J..,Holland-Cunz M.V..,Cording F..,Pfanschilling F.L..,Wills C..,...&Stimming U..(2018).Asymmetric polyoxometalate electrolytes for advanced redox flow batteries.Energy & Environmental Science,11(10).
MLA	Friedl J.,et al."Asymmetric polyoxometalate electrolytes for advanced redox flow batteries".Energy & Environmental Science 11.10(2018).