Journal
ELECTROCHIMICA ACTA
Volume 130, Issue -, Pages 660-669Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.03.080
Keywords
supercapacitor; 3D nanocomposites; Ni foam; specific capacitances; asymmetric supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51362018, 21163010]
- Key Project of Chinese Ministry of Education [212183]
- Natural Science Funds for Distinguished Young Scholars of Gansu Province [1111RJDA012]
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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.
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