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

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

Applied Energy, 2014, vol. 134, issue C, 439-445

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

Keywords: Copper doping; Flow-like structure; Birnessite MnO2 (δ-MnO2); Supercapacitor; Electrochemical properties (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.apenergy.2014.08.050

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