Ultrafast Na+-storage in TiO2-coated MoS2@N-doped carbon for high-energy sodium-ion hybrid capacitors

被引:67
|
作者
Li, Yuzhu [1 ]
Wang, Huanwen [1 ]
Wang, Libin [2 ]
Wang, Rui [1 ]
He, Beibei [1 ]
Gong, Yansheng [1 ]
Hu, Xianluo [2 ]
机构
[1] China Univ Geosci, Fac Mat & Chem, Minist Educ, Engn Res Ctr Nanogeomat, Wuhan 430074, Hubei, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
MoS2; N-doped carbon; TiO2; Sodium-ion capacitor; Atomic layer deposition; ANODE MATERIAL; POROUS CARBON; LITHIUM; PERFORMANCE; NANOSHEETS; BATTERY; DENSITY; NANOWIRES; ELECTRODES; NANOCABLES;
D O I
10.1016/j.ensm.2019.05.024
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
As a hybrid battery-supercapacitor energy-storage device, Na-ion capacitors (NICs) are regarded to show both high-energy performance and low lost. However, the sluggish electrochemical kinetics and low specific capacities of most reported anode materials, severely restrict their practical applications. Herein, we report that ultrafine Mo2C nanoparticles are homogeneously embedded within an N-doped carbon matrix (Mo2C@NC) through a simple solid-phase reaction. After sulfuration, the optimal MoS2@NC electrode exhibits a high discharge capacity (535.3 mAh g(-1) at 0.1 A g(-1)) and outstanding rate capability (420.2 mAh g(-1) at 20 A g(-1) with a remarkable retention of 78% relative to 0.1 A g(-1)), but its cycle life is not satisfied. To address this issue, amorphous TiO2 coating of different thicknesses is further coated on MoS2@NC by atomic layer deposition. It is found that the electrode made of TiO2-coated MoS2@NC shows excellent cyclability with 100% capacity retention after 500 cycles at 2 A g(-1). Furthermore, a novel hybrid NIC is constructed by using TiO2/MoS2@NC as an anode and commercial activated carbon (AC) as a cathode, delivering high energy and power densities (148 Wh kg(-1)/200 W kg(-1), 64.4 Wh kg(-1)/20,000 W kg(-1)). The performance outperforms the recently reported NIC counterparts.
引用
收藏
页码:95 / 104
页数:10
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