Mesostructured CuCo2S4/CuCo2O4 nanoflowers as advanced electrodes for asymmetric supercapacitors

被引:177
作者
Xu, Xiaowei [1 ,2 ]
Liu, Ying [3 ]
Dong, Pei [4 ]
Ajayan, Pulickel M. [4 ]
Shen, Jianfeng [1 ]
Ye, Mingxin [1 ]
机构
[1] Fudan Univ, Inst Special Mat & Technol, Shanghai 200433, Peoples R China
[2] Shanghai Inst Technol, Dept Mat Sci & Engn, Shanghai 201418, Peoples R China
[3] Wuhan Text Univ, Inst Technol, Wuhan 430200, Hubei, Peoples R China
[4] Rice Univ, Dept Mat Sci & NanoEngn, 6100 Main St, Houston, TX 77005 USA
基金
中国博士后科学基金;
关键词
CuCo2S4/CuCo2O4; heterostructure; Energy storage; Asymmetric supercapacitors; 3D mesoporous structure; CUCO2O4; NANOPARTICLES; HIGH-ENERGY; GRAPHENE; STORAGE; ARRAYS; FOAM; MNO2; CONSTRUCTION; CAPACITANCE; HYDROXIDES;
D O I
10.1016/j.jpowsour.2018.08.012
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
Novel high performance active electrode materials for green energy-storage systems attract great interest in the past decades. Here, for the first time, 3D mesoporous flower-like CuCo2S4/CuCo2O4 heterostructure with compatible nanoscale interfaces and tunable chemical composition is designed and prepared. Because of the unique architecture and components, the electrode exhibits large electrochemical surface area, enhanced conductivity, short ion diffusion path, and rapid electron and ion transport rate, resulting in its outstanding electrochemical properties of specific capacity (599.9C g(-1)), excellent cycling stability and high rate capability. An asymmetric supercapacitor device based on these unique nanoflowers as cathode and graphene aerogel as anode delivers substantial energy density (33.2 W h kg(-1)), power density (13.3 kW kg(-1)), and high long-term stability (73% capacitance retention after 10000 cycles). These results imply great potential application in high-performance supercapacitors.
引用
收藏
页码:96 / 103
页数:8
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