假电容器
材料科学
纳米颗粒
纳米技术
储能
纳米线
电压
MXenes公司
软机器人
电容感应
超级电容器
电气工程
电化学
物理化学
功率(物理)
工程类
物理
执行机构
化学
量子力学
电极
作者
Zhan Cao,YinBo Zhu,Kai Chen,Quan Wang,Yujin Li,Xing Xiao,Jie Ru,Ling‐Guo Meng,Jie Shu,Netanel Shpigel,Lifeng Chen
标识
DOI:10.1002/adma.202401271
摘要
The advancement of aqueous micro-supercapacitors offers an enticing prospect for a broad spectrum of applications, spanning from wearable electronics to micro-robotics and sensors. Unfortunately, conventional micro-supercapacitors are characterized by low capacity and slopy voltage profiles, limiting their energy density capabilities. To enhance the performance of these devices, the use of 2D MXene-based compounds has recently been proposed. Apart from their capacitive contributions, these structures can be loaded with redox-active nanowires which increase their energy density and stabilize their operation voltage. However, introducing rigid nanowires into MXene films typically leads to a significant decline in their mechanical properties, particularly in terms of flexibility. To overcome this issue, super stretchable micro-pseudocapacitor electrodes composed of MXene nanosheets and in situ reconstructed Ag nanoparticles (Ag-NP-MXene) are herein demonstrated, delivering high energy density, stable operation voltage of ≈1 V, and fast charging capabilities. Careful experimental analysis and theoretical simulations of the charging mechanism of the Ag-NP-MXene electrodes reveal a dual nature charge storage mechanism involving ad(de)sorption of ions and conversion reaction of Ag nanoparticles. The superior mechanical properties of synthesized films obtained through in situ construction of Ag-NP-MXene structure show an ultra stretchability, allowing the devices to provide stable voltage and energy output even at 100% elongation.
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