MXene-based suspension electrode with improved energy density for electrochemical flow capacitors
MXene-based suspension electrode with improved energy density for electrochemical flow capacitors
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DOI：
10.1016/j.jpowsour.2021.230187
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发表时间：
2021-09
影响因子：
9.2
通讯作者：
Pushpendra Singh;Bilen Akuzum;C. Shuck;K. Pal;Y. Gogotsi;E. C. Kumbur
中科院分区：
文献类型：
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作者：
Pushpendra Singh;Bilen Akuzum;C. Shuck;K. Pal;Y. Gogotsi;E. C. Kumbur
悬浮电极中具有高填充密度和低粘度的高电容材料的开发对于向高效率、低足迹电化学液流电容器（EFC）发展至关重要。在这里，我们报告的第一个电化学和流变特性的MXene为基础的悬浮电极，使用多层Ti 3C 2 Tx作为活性材料和炭黑（CB）作为导电添加剂在对称和不对称的EFC设备。在对称Ti 3C 2 Tx器件的情况下，Ti 3C 2 Tx浓度固定为22体积%并且CB浓度在0.5至2.0体积%之间变化。对称的器件布置提供了240 F ml−1（2 mV s−1）的高电容和2.65 Wh l− 1的体积能量密度（功率密度为47.82 W l−1）。此外，为了扩展潜在窗口，研究了活性炭和Ti 3C 2 Txis的不对称装置组件。这种布置允许1 V的稳定工作电位窗口，能量密度为4.12 Wh l-1，功率密度为31.73 W l-1。总体而言，多层Ti 3C 2 Tx似乎是可流动电极应用的优秀候选者，由于其高电化学活性、优异的导电性和多功能表面化学性质，其提供高电容、能量密度和低粘度。
The development of high capacitance materials with high packing density and low viscosity in suspension electrodes is critical for progressing towards high-efficiency, low-footprint electrochemical flow capacitors (EFCs). Here, we report on the first electrochemical and rheological characterization of MXene-based suspension electrodes, using multilayer Ti3C2Txas the active material and carbon black (CB) as the conductive additive in symmetric and asymmetric EFC devices. In the case of symmetric Ti3C2Txdevices, the Ti3C2Txconcentration is fixed to 22 vol.% in the slurry and the CB concentration is varied from 0.5 to 2.0 vol.%. The symmetric device arrangement offers a high capacitance of 240 F ml−1(2 mV s−1) and volumetric energy density of 2.65 Wh l−1@ power density of 47.82 W l−1. Additionally, to extend the potential window, an asymmetric device assembly of activated carbon and Ti3C2Txis investigated. This arrangement allows a stable operating potential window of 1 V with an energy density of 4.12 Wh l−1and power density of 31.73 W l−1. Overall, multilayer Ti3C2Txseems to be excellent candidate for flowable electrode applications, offering high capacitance, energy density and low viscosity due to its high electrochemical activity, excellent electrical conductivity, and versatile surface chemistry.