MXenes公司
材料科学
阳极
阴极
超级电容器
普鲁士蓝
假电容
电容器
离子半径
电容
电极
功率密度
化学工程
电池(电)
储能
离子
光电子学
纳米技术
电压
电化学
电气工程
物理化学
功率(物理)
化学
有机化学
工程类
物理
量子力学
作者
Fangwang Ming,Hanfeng Liang,Wenli Zhang,Jun Ming,Yongjiu Lei,Abdul‐Hamid Emwas,Husam N. Alshareef
出处
期刊:Nano Energy
[Elsevier]
日期:2019-08-01
卷期号:62: 853-860
被引量:188
标识
DOI:10.1016/j.nanoen.2019.06.013
摘要
High power K+ ion capacitors have great potential in various large-scale applications because of the cost advantages and the low redox potential of K/K+. However, the large ionic radius of potassium brings huge challenges for the development of suitable electrode materials. Here we demonstrate a general strategy for preparing porous MXene electrodes that can significantly enhance K+ storage performance. Using V2C MXene as a model system, we show that the K+ ion storage capacity can be greatly boosted by a simple sequential acid/alkali treatment. The resulting product, K–V2C, not only delivers a capacity of 195 mAh g−1 (in contrast to 98 mAh g−1 of pristine V2C) at 50 mA g−1, but also good rate performance. The charge storage mechanism was carefully studied and is shown to involve a solvent co-intercalation process. In addition, full cells were fabricated by coupling the K–V2C anode and Prussian blue analogous (KxMnFe(CN)6) cathode, which can work at a high average operating voltage of ~3.3 V within a wide range (0.01 V–4.6 V). Moreover, the devices can achieve a high energy density of 145 Wh kg−1 at a power density of 112.6 W kg−1, suggesting that K–V2C, and other porous MXenes prepared by our approach, are promising electrodes in mobile ion capacitors.
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