A compound would allow sustainable, profitable and large -scale energy storage

Pour produire une batterie d’oxydoréduction à flux rentable, des chercheurs basés à l’Université technologique de Chine du Sud ont synthétisé un composé moléculaire qui sert d’électrolyte à faible coût, permettant ainsi d’obtenir une batterie à flux stable qui conserve une capacité de 99,98 % par cycle. Ils ont publié leur approche le 14 août dans la revue Energy Material Advances.

Composed of two reservoirs of opposite liquid electrolytes, the battery pumps positive and negative liquids along a separator membrane sandwich between electrodes, facilitating ion exchanges to produce energy.Important work has been devoted to the development of the liquid of the negative electrolyte, while the liquid of the positive electrolyte received less attention, according to the corresponding author, Zhenxing Liang, professor at the Key Laboratory of Fuel Cell Technology ofGuangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology.

"Aqueous oxydidéduction batteries can provide stable electricity production using unstable solar and wind energy, and they have been recognized as promising large -scale energy storage technology," said Liang."The electroactive organic merit of the abundance of elements, low cost and flexible molecular control over electrochemical characteristics for positive and negative electrolytes are considered to be the key to the development of the next generation of battery with redo flow."" "

Liang and his team focused on the tempo, a chemical compound with easily reversed oxidation states and high energy potential, desired quality in positive electrolytes.

"" "Cependant, le TEMPO ne peut pas être directement appliqué aux batteries à flux redox aqueuses en raison de la forte hydrophobie du squelette moléculaire"" ", a déclaré Liang, expliquant que le TEMPO, laissé non modifié, ne se dissoudra pas dans le liquide nécessaire pour faciliter l’échange d’énergie dans les batteries à flux. "" "Nous avons développé une stratégie pour fonctionnaliser le TEMPO avec du viologène, un composé organique qui a des réactions d’oxydoréduction hautement réversibles, afin d’améliorer l’hydrophilie du TEMPO.»

According to Liang, the viologena is very soluble in water, which increases the capacity of the tempo to dissolve in the water.The violiologène also chemically removes electrons from its atomic partners, which increases its potential for change of oxidative state. Le viologène est également un sel, ce qui confère à TEMPO ce que Liang appelle "" "une conductivité décente» dans une solution aqueuse.

When the tempo synthesized and modified by the viologena was tested in a flow battery, the researchers found that the battery retained a capacity of 99.98 % by cycle, which means that the battery could keep almost all the energy storedWhen it was not used.

"" "Ce travail permet de surmonter les inconvénients du TEMPO par la fonctionnalisation du viologène et de réaliser son application dans une batterie à flux redox aqueuse"" ", a déclaré Liang. "" "Le concept de conception moléculaire fournit une stratégie pour de nouveaux matériaux électroactifs organiques et jette les bases de l’application de la batterie à flux organique aqueux."" "

The other contributors are Shuzhi Hu, Liwen Wang, Xianzhi Yuan, Zhipeng Xiang, Mingbao Huange, Peng Luo, Yufeng Liu and Zhiyong Fu, all of the key laboratory of fuel cells technology from the province of Guangdong, of the school ofChemistry and chemical engineering from the South China Technological University.Hu is also affiliated with the School of Science and Engineering of Materials of the Sun Yat-Sen University.

The National Foundation of Natural Sciences of China (21975081 and 21905114) supported this research.

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Credit: Liwen Wang, South China University of Technology

Reference

Authors: Shuzhi Hu, 1,2 Liwen Wang, 1 Xianzhi Yuan, 1 Zhipeng Xiang, 1 Mingbao Huang, 1 Peng Luo, 1 Yufeng Liu, 1 Zhiyong Fu, 1 and Zhenxing Liang1

Title of Original Paper: Vioogen-Decorated Tempo for Neutral Aqueous Organic Redox Flow Batteries

Journal: Energy Material Advances

Doi: 10.34133/2021/9795237

Affiliations:

1 Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China

2 School of Materials Science and Engineering, Sun Yat University, Guangzhou 510275, China

[ Communiqué ]Lien principal : spj.sciencemag.Org/Journals/Energymatadv/2021/9795237/