化学
喹喔啉
氧化还原
溶解度
流动电池
储能
乙腈
化学工程
组合化学
无机化学
有机化学
电极
电解质
物理化学
功率(物理)
物理
工程类
量子力学
作者
Wenhao Zhang,Ryan Walser-Kuntz,Jacob S. Tracy,Tim K. Schramm,James Shee,Martin Head‐Gordon,Gan Chen,Brett A. Helms,Melanie S. Sanford,F. Dean Toste
摘要
Redox flow batteries (RFBs) are a promising stationary energy storage technology for leveling power supply from intermittent renewable energy sources with demand. A central objective for the development of practical, scalable RFBs is to identify affordable and high-performance redox-active molecules as storage materials. Herein, we report the design, synthesis, and evaluation of a new organic scaffold, indolo[2,3-b]quinoxaline, for highly stable, low-reduction potential, and high-solubility anolytes for nonaqueous redox flow batteries (NARFBs). The mixture of 2- and 3-(tert-butyl)-6-(2-methoxyethyl)-6H-indolo[2,3-b]quinoxaline exhibits a low reduction potential (−2.01 V vs Fc/Fc+), high solubility (>2.7 M in acetonitrile), and remarkable stability (99.86% capacity retention over 49.5 h (202 cycles) of H-cell cycling). This anolyte was paired with N-(2-(2-methoxyethoxy)-ethyl)phenothiazine (MEEPT) to achieve a 2.3 V all-organic NARFB exhibiting 95.8% capacity retention over 75.1 h (120 cycles) of cycling.
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