Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by   Cation Intercalation and Surface Modification

doi:10.1002/aenm.201602725

CORC > 北京大学 > 化学与分子工程学院

	Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by Cation Intercalation and Surface Modification
	Li, Jian ; Yuan, Xiaotao ; Lin, Cong ; Yang, Yanquan ; Xu, Le ; Du, Xin ; Xie, Jinglin ; Lin, Jianhua ; Sun, Junliang
刊名	ADVANCED ENERGY MATERIALS
	2017
关键词	TRANSITION-METAL CARBIDES ELECTROCHEMICAL ENERGY-STORAGE HIGH VOLUMETRIC CAPACITANCE SUPERCAPACITORS CARBON OXIDE ELECTRODES GRAPHENE TI3ALC2 LAYERS
DOI	10.1002/aenm.201602725
英文摘要	Supercapacitors attract great interest because of the increasing and urgent demand for environment-friendly high-power energy sources. Ti3C2, a member of MXene family, is a promising electrode material for supercapacitors owing to its excellent chemical and physical properties. However, the highest gravimetric capacitance of the MXene-based electrodes is still relatively low (245 F g(-1)) and the key challenge to improve this is to exploit more pseudo-capacitance by increasing the active site concentration. Here, a method to significantly improve the gravimetric capacitance of Ti3C2Tx MXenes by cation intercalation and surface modification is reported. After K+ intercalation and terminal groups (OH-/F-) removing, the intercalation pseudocapacitance is three times higher than the pristine MXene, and MXene sheets exhibit a significant enhancement (about 211% of the origin) in the gravimetric capacitance (517 F g(-1) at a discharge rate of 1 A g(-1)). Moreover, the as-prepared electrodes show above 99% retention over 10 000 cycles. This improved electrochemical performance is attributed to the large interlayer voids of Ti3C2 and lowest terminated surface group concentration. This study demonstrates a new strategy applicable to other MXenes (Ti2CTx, Nb2CTx, etc.) in maximizing their potential applications in energy storage.; National Basic Research Program; National Natural Science Foundation of China [21527803, 21471009, 21321001, 2013CB933402, 11275012, 2016YFA0301004]; SCI(E); ARTICLE; 15; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471546]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Li, Jian,Yuan, Xiaotao,Lin, Cong,et al. Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by Cation Intercalation and Surface Modification[J]. ADVANCED ENERGY MATERIALS,2017.
APA	Li, Jian.,Yuan, Xiaotao.,Lin, Cong.,Yang, Yanquan.,Xu, Le.,...&Sun, Junliang.(2017).Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by Cation Intercalation and Surface Modification.ADVANCED ENERGY MATERIALS.
MLA	Li, Jian,et al."Achieving High Pseudocapacitance of 2D Titanium Carbide (MXene) by Cation Intercalation and Surface Modification".ADVANCED ENERGY MATERIALS (2017).