MXenes公司
超级电容器
材料科学
堆积
电容
电极
化学工程
电池(电)
功率密度
电化学
纳米技术
储能
电流密度
光电子学
化学
功率(物理)
量子力学
物理
工程类
物理化学
有机化学
作者
Baolei Shen,Xilin Liao,Xuefei Zhang,Haitao Ren,Jia‐Horng Lin,Ching‐Wen Lou,Tingting Li
标识
DOI:10.1016/j.electacta.2022.140144
摘要
The supercapacitor is a kind of electrochemical energy storage element, has attracted widespread attention, however, it is limited by a lack of ideal electrode materials with excellent cycle stability and high specific capacitance. To address this issue, we prepared Nb2CTx MXene-framework coated with Co3O4 to construct a robust 2D cross-linked structure. In this design, the self-assembly of Co3O4 between Nb2C MXene layers can effectively prevent the self-stacking of MXene sheets. The high conductivity and abundant active groups on the surface of MXenes provide a large number of active sites for the uniform distribution of Co3O4 on Nb2C MXene. The Co-MXene electrode achieves a specific capacitance of up to 1061 F g−1 at the current density of 2 A g−1, which is higher than the pure Co3O4 electrode and Nb2C MXene electrode. The asymmetric supercapacitors (ASCs) of Co-MXene//AC delivers specific energy densities (Es) of 60.3, 42.5, 31.0, 19.7 Wh kg−1 at specific power density (Ps) of 0.67, 2.0, 3.4, and 6.8 kW kg−1, respectively. The capacitance retention rate of 93% after 1000 cycles at 5 A g−1. The study provides a valuable guideline for fabricating satisfactory electrochemical energy storage devices by a feasible method.
科研通智能强力驱动
Strongly Powered by AbleSci AI