Journal
CHEMICAL ENGINEERING JOURNAL
Volume 336, Issue -, Pages 562-569Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.12.055
Keywords
NiMn-LDH; CuCo2S4; Asymmetric supercapacitor; Core-shell; Pseudocapacitors
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Funding
- National Natural Science Foundation of China, China [51575135, 51622503, U1537206]
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Elaborate design and synthesis of core-shell hybrid structures consisting of multiple components have been considered as the effective approach to developing electrode materials for high-performance supercapacitors. Herein, the hybrid structure consisting of CuCo2S4 core and NiMn-layered double hydroxide (NiMn-LDH) shell is hydrothermally in situ synthesized on nickel foam without organic binders as electrode materials. The resultant CuCo2S4@NiMn-LDH core-shell hybrid arrays exhibits a high specific capacitance of 2520 F g(-1) at 2 A g-1, good rate capability with a long cycle lifetime. Additionally, the obtained CuCo2S4@NiMn-LDH serves as the positive electrode while the activated carbon (AC) acts as the negative electrode, which is assembled into an asymmetric supercapacitor. Impressively, the obtained asymmetric supercapacitor (CuCo2S4@NiMn-LDH//AC) delivers a high energy density of 45.8 Wh kg(-)1 at the power density of 1499 W kg(-1). Thereby, these electrochemical performances demonstrate that as-fabricated CuCo2S4@NiMn-LDH core-shell arrays are the promising candidates as electrodes for high-performance supercapacitors.
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