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Synthesis of MnNb2O6 with hierarchical structure as a novel electrode material for high-performance supercapacitors.
- Source :
-
Journal of Alloys & Compounds . Jun2018, Vol. 750, p428-435. 8p. - Publication Year :
- 2018
-
Abstract
- Columbite compound MnNb 2 O 6 , consisted the layers with slightly distorted hexagonal-closed-packed oxygen sublattice, has abundant reaction sites whereby the interlayered ions can occur faradic reaction to enhance the charge storage capability. Here, we first report three-dimensional nanostructure of MnNb 2 O 6 as electrode materials for electrochemical pseudocapacitor synthesized through hydrothermal method. The crystal morphologies of MnNb 2 O 6 show an evolution with the hydrothermal time, from primary spindle-like particles grown for 12 h and undergrown star-like crystals for 18 h, to hierarchical star-like crystals for 1 day and overgrown crystals for 3 days. MNO-1d sample synthesized for 1 day possesses ordered six-leaf nanostructure composed of hierarchical nano-sheets (thickness ∼30 nm). To explore its potential applications for supercapacitor, MnNb 2 O 6 sample as electrode material is characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge measurements. MNO-1d demonstrates an outstanding specific capacitance of 350 F g −1 and rate capability with a high capacitance retention of ∼90% of its initial capacitance after 10000 cycles at a high current density of 10 A g −1 . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 750
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 129273205
- Full Text :
- https://doi.org/10.1016/j.jallcom.2018.04.031