One-step synthesis of copper-cobalt carbonate hydroxide microsphere for electrochemical capacitors with superior stability

Copper cobalt carbonate hydroxide (Cu-Co CH) microspheres were synthesized as a pseudocapacitive electrode material via a simple one-step hydrothermal method. Morphological characterization of the Cu-Co CH microspheres was carried out by scanning electron microscopy and transmission electron microsc...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2017-12, Vol.807, p.10-18
Main Authors: Guo, Song Hao, Yuan, Peng Wei, Wang, Jiao, Chen, Wen Qiang, Ma, Ke Yuan, Liu, F., Cheng, J.P.
Format: Article
Language:English
Subjects:
Activated carbon
Capacitance
Capacitors
Cobalt
Component parts
Copper
Copper cobalt carbonate hydroxide
Dandelion-like structure
Electrochemical capacitors
Electrochemical stability
Electrode materials
Electrodes
Energy storage
Flux density
Microspheres
Morphology
Scanning electron microscopy
Stoichiometry
Structural stability
Transmission electron microscopy
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Summary:Copper cobalt carbonate hydroxide (Cu-Co CH) microspheres were synthesized as a pseudocapacitive electrode material via a simple one-step hydrothermal method. Morphological characterization of the Cu-Co CH microspheres was carried out by scanning electron microscopy and transmission electron microscopy, showing their dandelion-like structure with the size approximately 4–7μm. The crystalline structure, morphology and electrochemical performances of Cu-Co CH materials could be readily dominated by the molar ratio of Cu to Co. Among various stoichiometries of Cu-Co CHs, sample Cu0.48Co1.52 CH delivered the highest specific capacitance of 397.3Fg−1 at 1Ag−1 with a good rate capability. Cu0.48Co1.52 CH electrode material also exhibited a remarkably excellent cycling stability, ~99% of initial capacitance retention even after 10,000 charge/discharge cycles at 2Ag−1. An asymmetric energy storage device was assembled by using Cu0.48Co1.52 CH as positive electrode and activated carbon as negative electrode in 2M KOH electrolyte. The hybrid capacitor device could deliver an energy density of 26.3Whkg−1 at a power density of 400.2Wkg−1, and remain 16.7Whkg−1 at 8374.2Wkg−1. Meanwhile, it also showed amazing stability with ~99% capacity retention after 10,000cycles. Based on the above results, Cu-Co CH microspheres possessed practical application as electrode materials for electrochemical capacitors due to their good structural stability in KOH electrolyte. •Copper cobalt carbonate hydroxide (CH) microspheres are synthesized by simple method.•The morphology, structure and electrochemical performances of Cu-Co CH are dominated by Cu/Co ratio.•The Cu-Co CH electrodes exhibit good capacitive performances.•The hybrid capacitor Cu-Co CH//AC shows extraordinary cycling stability.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2017.11.009