Liquid crystalline phase synthesis of nanoporous MnO{sub 2} thin film arrays as an electrode material for electrochemical capacitors
- College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China)
- School of Geosciences, China University of Petroleum, Qingdao, Shandong 266555 (China)
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (China)
Graphical abstract: Three-dimensional (3D) MnO{sub 2} thin film arrays with nanoporous structure is electrodeposited on Ti foil from hexagonal lyotropic liquid crystalline phase. Low-angle X-ray diffraction (XRD), wide-angle XRD, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) are employed to study the morphology and the structure of the as-synthesized MnO{sub 2} materials. Galvanostatic charge/discharge measurements show the nanoporous, 3D electrode material exhibits excellent capacitive performance between the potential range of −0.1 to 0.9 V, and a maximum specific capacitance as high as 462 F g{sup −1} are achieved in 0.5 M Na{sub 2}SO{sub 4} solution at a charge/discharge current density of 4 A g{sup −1}. Highlights: ► 3D MnO{sub 2} thin film arrays with nanoporous structure is fabricated for the first time. ► A maximum specific capacitance as high as 462 F g{sup −1} is obtained. ► The 3D and nanoporous superarchitecture facilitate electrolyte penetration. -- Abstract: Three-dimensional (3D) MnO{sub 2} thin film arrays with nanoporous structure is electrodeposited on Ti foil from hexagonal lyotropic liquid crystalline phase. Low-angle X-ray diffraction (XRD), wide-angle XRD, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) are employed to study the morphology and the structure of the as-synthesized MnO{sub 2} materials. Galvanostatic charge/discharge measurements show the nanoporous, 3D electrode material exhibits excellent capacitive performance between the potential range of −0.1 to 0.9 V, and a maximum specific capacitance as high as 462 F g{sup −1} are achieved in 0.5 M Na{sub 2}SO{sub 4} solution at a charge/discharge current density of 4 A g{sup −1}.
- OSTI ID:
- 22215545
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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