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

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DOIResolve DOI: http://doi.org/10.1016/j.apenergy.2014.08.050
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TypeArticle
Journal titleApplied Energy
ISSN0306-2619
Volume134
Pages439445; # of pages: 7
SubjectCopper doping; Flow-like structure; Birnessite MnO2 (d-MnO2); Supercapacitor; Electrochemical properties
AbstractThe 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.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21272832
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Record identifierc9242b27-c2a0-4ce7-8b64-739637beced8
Record created2014-12-03
Record modified2016-05-09
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