氧化还原
流动电池
法拉第效率
储能
电化学
电解质
化学
计时安培法
无机化学
电池(电)
铜
化学工程
普鲁士蓝
水溶液
电极
循环伏安法
有机化学
热力学
物理化学
功率(物理)
工程类
物理
作者
Elena Zanzola,Solène Gentil,Grégoire C. Gschwend,Danick Reynard,Evgeny Smirnov,Christopher R. Dennison,Hubert H. Girault,Pekka Peljo
标识
DOI:10.1016/j.electacta.2019.134704
摘要
All redox flow batteries suffer from low energy storage density in comparison with conventional Li-ion batteries. However, this issue can be mitigated by utilization of solid energy storage materials to enhance the energy storage capacity. In this paper we demonstrate the utilization of copper hexacyanoferrate (CuHCF) Prussian blue analogue for this purpose, coupled with N,N,N-2,2,6,6-heptamethylpiperidinyl oxy-4-ammonium chloride (TEMPTMA) as a soluble redox mediator to target the redox transitions of the solid material. In this case, indirect charging and discharging of CuHCF suspended in the electrolyte by electrochemically oxidized/reduced TEMPTMA was observed by chronoamperometry. Secondly, electrochemistry of different CuHCF composites with carbon black and multi-walled carbon nanotubes were investigated, highlighting that the high conductivity of the solid energy storage materials is crucial to access the maximal charge storage capacity. Finally, a CuHCF-TEMPTMA/Zn aqueous redox flow battery achieved stable cycling performances with high coulombic efficiency of 95% and volumetric capacity of 350 C mL−1.
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