Design and synthesis of 3D Co3O4@MMoO4 (M=Ni, Co) nanocomposites as high-performance supercapacitor electrodes

被引:108
作者
Ma, Xue-Jing [1 ]
Kong, Ling-Bin [1 ,2 ]
Zhang, Wei-Bin [1 ]
Liu, Mao-Cheng [1 ]
Luo, Yong-Chun [2 ]
Kang, Long [2 ]
机构
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
[2] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China
基金
中国国家自然科学基金;
关键词
supercapacitor; 3D nanocomposites; Ni foam; specific capacitances; asymmetric supercapacitors; NANOFLAKE MATERIALS; NANOWIRE ARRAYS; NI FOAM; NANORODS; CO3O4; NANOSTRUCTURES; FABRICATION; MORPHOLOGY; CARBON;
D O I
10.1016/j.electacta.2014.03.080
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Recent attentions have been focused on the synthesis and application of nanocomposites for supercapacitors, which can have superior electrochemical performance than single-structured materials. Here we designed and synthesized three-dimensional (3D) Co3O4@MMoO4 (M = Ni, Co) nanocomposites on Ni foam, which combined separately the advantages of the good rate capability of Co3O4 and the high specific capacitances of MMoO4 (M = Ni, Co), and the materials have shown surprising specific capacitances (2041 Fg(-1) of Co3O4@NiMoO4 and 857 Fg(-1) of Co3O4@CoMoO4 at a current density of 0.5 A g(-1)) and excellent cycling stability (72% capacitance retention of Co3O4@NiMoO4 and 100% capacitance retention of Co3O4@CoMoO4 after 3000 cycles). To enhance energy density, the asymmetric supercapacitors were assembled where Co3O4@MMoO4 (M = Ni, Co) and activated carbon (AC) acted as the positive and negative electrodes, respectively. The maximum specific capacitance (128 Fg(-1) of AC//Co3O4@NiMoO4 and 105 Fg(-1) of AC//Co3O4@CoMoO4) and the specific energy 41.9 Wh kg(-1) of AC//Co3O4@ NiMoO4 and 38 Wh kg(-1) of AC//Co3O4@CoMoO4) are demonstrated for a cell voltage between 0 to 1.6V, exhibiting a high energy density and stable power characteristics. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:660 / 669
页数:10
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