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Synthesis and structure determination of potassium copper selenide nanowires and solid-state supercapacitor application
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2014 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 268, 522-532 p.Article in journal (Refereed) Published
Abstract [en]

The new ternary alkali metal copper chalcogenide KCu4Se8 nanowires with average length of 30 mu m are synthesized using a modified composite-hydroxide mediated (M-CHM) approach. The prepared KCu4Se8 is characterized by XRD, EDS, FESEM and TEM analysis. The structure is determined by the newly developed Rotation Electron Diffraction technique. It is identified to be a body center tetragonal phase. The prepared KCu4Se8 is used to fabricate solid-state supercapacitors in which the thin film of the electrodes are made with pressure of 0 MPa, 5 MPa and 10 MPa, and their electrochemical properties are tested. It is found that 0 MPa supercapacitor displays best electrochemical performance and the specific capacitance of 25.3 F g(-1) is obtained at the scan rate of 5 mV s(-1). It also shows good long-term cycle property by recording 5000 cycles of galvanostatic charge/discharge operation. The specific capacitance can be enhanced to 93.7 F g(-1) at the scan rate of 5 mV s(-1) by coating 0.1 mg V2O5 nanowire on 0 MPa KCu4Se8 electrode.

Place, publisher, year, edition, pages
2014. Vol. 268, 522-532 p.
Keyword [en]
Potassium copper selenide, Nanowire, Supercapacitor, Vanadium pentoxide
National Category
Chemical Sciences
URN: urn:nbn:se:su:diva-107409DOI: 10.1016/j.jpowsour.2014.06.079ISI: 000340311800067OAI: diva2:748715


Available from: 2014-09-21 Created: 2014-09-15 Last updated: 2014-09-21Bibliographically approved

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Chen, HongSun, Junliang
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Department of Materials and Environmental Chemistry (MMK)
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