journal article·2022-04-08Open access

Effective Design Strategy of Small Bipolar Molecules through Fused Conjugation toward 2.5 V Based Redox Flow Batteries

Yue Liu, Gaole Dai, Yuanyuan Chen, Ru Wang, Huamei Li, Xueliang Shi, Xiaohong Zhang, Yang Xu, Yu Zhao

ACS Energy Letters· Volume 7· Issue 4

Abstract

Using bipolar redox-active molecules (BRMs) as active materials is a practical way to address electrolyte crossover and resultant unpredictable side reactions in redox-flow batteries. However, the development of BRMs is greatly hindered by difficulties in finding new molecules from limited redox-active moieties and in achieving high cell voltage to compete with existing flow battery chemistries. This study proposes a strategy for design of high-voltage BRMs using fused conjugation that regulates the redox potential of integrated redox-active moieties. As a demonstration, quaternary N and ketone redox moieties are used to construct a new BRM that shows a prominent voltage gap with good electrochemical stability. A symmetrical redox-flow cell based on this molecule exhibits a high voltage of 2.5 V and decent cycling stability. This study provides a general strategy for designing new BRMs that may enrich the cell chemistries of organic redox-flow batteries.
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Research context

OpenAlex topics: Advanced battery technologies research · Electrocatalysts for Energy Conversion · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University, 199 Renai Road, Suzhou, Jiangsu 215123, People’s Republic of China

Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.

College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Hangzhou, Zhejiang 311121, People’s Republic of China

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200062, People’s Republic of China

Funding

Engineering and Physical Sciences Research Council · Royal Society · Leverhulme Trust · Collaborative Innovation Center of Suzhou Nano Science and Technology · Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · Higher Education Discipline Innovation Project · Natural Science Foundation of Zhejiang Province · Joint International Research Laboratory of Carbon-Based Functional Materials and Devices

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