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Controllable hydrothermal synthesis of Cu-doped δ-MnO2 films with different morphologies for energy storage and conversion using supercapacitors

Author

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  • Su, Xiaohui
  • Yu, Lin
  • Cheng, Gao
  • Zhang, Huanhua
  • Sun, Ming
  • Zhang, Lei
  • Zhang, Jiujun

Abstract

The δ-MnO2 and Cu-doped δ-MnO2 grown on Ni foams are synthesized by a simple hydrothermal method for supercapacitor electrode application. The samples are characterized by XRD, ICP-AES, SEM, and BET for its composition, structure/morphology, and BET surface area. The electrochemical properties of the electrodes are studied by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) in 1M Na2SO4 solution. The results show that copper addition can vary the self-assembly of δ-MnO2 nanosheets, inducing the formation of flower-like structure. The morphology and electrochemical performance of the formed δ-MnO2 electrodes can be controlled by simply tuning the copper doping concentration. The 2at.% Cu-doped δ-MnO2 film obtains the maximum specific capacitance as high as 296Fg−1 at 1Ag−1, which is 80% higher than that of the pure δ-MnO2 film. Furthermore, it also shows a better cyclic stability than undoped δ-MnO2 film. The enhanced electrochemical properties may be attributed to its optimized hybrid nanosheet network and flow-like structure. A possible explanation for such enhancement in electrochemical properties of Cu-doped δ-MnO2 films has been discussed in this paper

Suggested Citation

  • Su, Xiaohui & Yu, Lin & Cheng, Gao & Zhang, Huanhua & Sun, Ming & Zhang, Lei & Zhang, Jiujun, 2014. "Controllable hydrothermal synthesis of Cu-doped δ-MnO2 films with different morphologies for energy storage and conversion using supercapacitors," Applied Energy, Elsevier, vol. 134(C), pages 439-445.
    • Handle: RePEc:eee:appene:v:134:y:2014:i:c:p:439-445
    DOI: 10.1016/j.apenergy.2014.08.050
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    Cited by:

    1. Su, Y. & Zhitomirsky, I., 2015. "Asymmetric electrochemical supercapacitor, based on polypyrrole coated carbon nanotube electrodes," Applied Energy, Elsevier, vol. 153(C), pages 48-55.
    2. Yuan, Chuanjun & Lin, Haibo & Lu, Haiyan & Xing, Endong & Zhang, Yusi & Xie, Bingyao, 2016. "Synthesis of hierarchically porous MnO2/rice husks derived carbon composite as high-performance electrode material for supercapacitors," Applied Energy, Elsevier, vol. 178(C), pages 260-268.
    3. Wang, Xue & Deng, Jinxing & Duan, Xiaojuan & Liu, Dong & Liu, Peng, 2015. "Fluorescent brightener CBS-X doped polypyrrole as smart electrode material for supercapacitors," Applied Energy, Elsevier, vol. 153(C), pages 70-77.

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