MXenes公司
材料科学
超级电容器
最大相位
电化学
单层
过渡金属
电容
衍射
循环伏安法
复合材料
电极
纳米技术
碳化物
光学
物理化学
催化作用
化学
物理
生物化学
作者
Shuangshuang Zhao,Chaofan Chen,Xin Zhao,Xuefeng Chu,Fei Du,Gang Chen,Yury Gogotsi,Yu Gao,Yohan Dall’Agnese
标识
DOI:10.1002/adfm.202000815
摘要
Abstract MXenes derived from 413 MAX phases are rarely studied but they have the potential to have superior electrical and mechanical properties thanks to a thicker monolayer (four layers of transition metal and three layers of carbon or nitrogen). In this paper, Nb 4 C 3 T x MXene nanosheets are delaminated and freestanding film with 1.77 nm interlayer spacing is obtained, which is larger than that of most previous MXenes. When Nb 4 C 3 T x freestanding films are tested as supercapacitors electrodes, Nb 4 C 3 T x shows high volumetric capacitance, 1075, 687, and 506 F cm −3 in 1 m H 2 SO 4 , 1 m KOH, and 1 m MgSO 4 , respectively, at the scan rate of 5 mV s −1 . An in situ X‐ray diffraction technique is used to study the structural changes during the electrochemical charging in 1 m H 2 SO 4 and 1 m MgSO 4 . There is almost no change in the 21 Å interlayer spacing during the cycling, because the space between the MXene layers is sufficient to accommodate the insertion and deinsertion of cations. This can lead to stable performance of Nb 4 C 3 T x MXene energy storage devices.
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