氧化还原
二氯甲烷
化学
水溶液
溶解度
膜
电池(电)
流动电池
溶剂化
化学工程
电解质
无机化学
有机化学
电极
溶剂
物理化学
工程类
功率(物理)
物理
量子力学
生物化学
作者
Jingchao Chai,Amir Lashgari,Andrew Eisenhart,Xiao Wang,Thomas L. Beck,Jianbing Jiang
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2021-03-03
卷期号:3 (4): 337-343
被引量:19
标识
DOI:10.1021/acsmaterialslett.1c00061
摘要
The lack of a suitable ionic exchange membrane has retarded the development of organic nonaqueous redox flow batteries (RFBs). Membrane-free redox stratified batteries, wherein electroactive materials in immiscible nonaqueous and aqueous solvents as anolyte and catholyte, have emerged as a promising strategy to mitigate the high dependence of RFBs on battery separators. Here we report the exploration of the application of immiscible electrolytes, water and dichloromethane, in membrane-free redox stratified batteries. With 0.5 M phenothiazines in dichloromethane as the catholytes and zinc metal in aqueous electrolyte as the anolyte, the aqueous/nonaqueous stratified battery presents stable long cycling with a capacity retention of 79.1% over 202 cycles under ambient testing conditions. Study of phenothiazines with varying lengths of alkyl chains (C0, C3, C8, and C18) reveals that the hydrophobicity of the phenothiazine molecules greatly affects the solubility in dichloromethane and battery cyclability. Computation on free energy of solvation and molecular dynamics is also performed to elucidate the hydrophobicity effects. The results presented in this work lay a solid foundation for potential development of the membrane-free RFBs.
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