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Designed Formation of MnO2@NiO/NiMoO4 Nanowires@Nanosheets Hierarchical Structures with Enhanced Pseudocapacitive Properties.
- Source :
- ChemElectroChem; Sep2016, Vol. 3 Issue 9, p1347-1353, 7p
- Publication Year :
- 2016
-
Abstract
- Although the preparation of hierarchical structures of transition-metal oxides (TMOs) has been intensively studied in recent years, it is still a great challenge to synthesize hierarchical multicomponent TMOs. Herein, we report a versatile method to fabricate three-component TMOs, namely MnO<subscript>2</subscript>@NiO/NiMoO<subscript>4</subscript> nanowires@nanosheets hierarchical porous composite structures (HPCSs). Through a combination of a chemical-solution-based route and subsequent calcination, the as-prepared MnOOH@NiMo precursor is topotactically transformed to MnO<subscript>2</subscript>@NiO/NiMoO<subscript>4</subscript> HPCSs without notable structural variation. Ultrathin NiO/NiMoO<subscript>4</subscript> nanosheets become interconnected into a honeycomb analogue with plentiful mesopores. Comparative results demonstrate the vital role of hexamethylenetetramine (HMT), and the solvent system in the formation of the MnOOH@NiMo precursor. When examined as electrode materials for electrochemical capacitors, MnO<subscript>2</subscript>@NiO/NiMoO<subscript>4</subscript> HPCSs, with an areal mass loading as high as 5 mg cm<superscript>−2</superscript>, deliver a specific capacitance of 918 F g<superscript>−1</superscript> at a current density of 1.0 A g<superscript>−1</superscript> and maintain good cycling stability, which displays better electrochemical performance than electrodes composed of a single component. Note that a high-voltage asymmetric supercapacitor is configured with MnO<subscript>2</subscript>@NiO/NiMoO<subscript>4</subscript> HPCSs (still as high as 2 mg cm<superscript>−2</superscript>) against activated carbon, and exhibits outstanding cycling stability with a high energy density of 26.5 Wh kg<superscript>−1</superscript> and a power density of 401 W kg<superscript>−1</superscript>. These analytical and experimental results clearly confirm the advantages of distinctive 3D multicomponent hierarchical architectures for engineering high-performance electrochemical capacitors. [ABSTRACT FROM AUTHOR]
- Subjects :
- TRANSITION metal oxides
METALLIC oxides
METHENAMINE
ADAMANTANE
POLYAMINES
Subjects
Details
- Language :
- English
- ISSN :
- 21960216
- Volume :
- 3
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- ChemElectroChem
- Publication Type :
- Academic Journal
- Accession number :
- 117925379
- Full Text :
- https://doi.org/10.1002/celc.201600146