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A high-performance asymmetric supercapacitor electrode based on a three-dimensional ZnMoO 4 /CoO nanohybrid on nickel foam.
- Source :
-
Nanoscale [Nanoscale] 2019 Jul 28; Vol. 11 (28), pp. 13639-13649. Date of Electronic Publication: 2019 Jul 10. - Publication Year :
- 2019
-
Abstract
- A two-step hydrothermal route was employed to fabricate a ZnMoO <subscript>4</subscript> /CoO nanohybrid supported on Ni foam. The ZnMoO <subscript>4</subscript> /CoO nanohybrid shows a three-dimensional criss-crossed structure. The specific surface area is enhanced from 45 m <superscript>2</superscript> g <superscript>-1</superscript> of ZnMoO <subscript>4</subscript> to 67 m <superscript>2</superscript> g <superscript>-1</superscript> of the ZnMoO <subscript>4</subscript> /CoO nanohybrid. Furthermore, the existence of electroactive CoO is in favor of reducing the charge transport resistance. The ZnMoO <subscript>4</subscript> /CoO nanohybrid electrode possesses a high capacitance of 4.47 F cm <superscript>-2</superscript> at 2 mA cm <superscript>-2</superscript> , which is much higher than those of ZnMoO <subscript>4</subscript> (1.07 F cm <superscript>-2</superscript> ) and CoO (2.47 F cm <superscript>-2</superscript> ). The ZnMoO <subscript>4</subscript> /CoO nanohybrid electrode also exhibits an ultrahigh cycling stability with 100.5% capacitance retention after 5000 cycles at 20 mA cm <superscript>-2</superscript> . In addition, an asymmetric all-solid-state supercapacitor was assembled using the ZnMoO <subscript>4</subscript> /CoO nanohybrid as the positive electrode and exfoliated graphite carbon paper as the negative electrode. The asymmetric supercapacitor exhibits a superior energy density of 58.6 W h kg <superscript>-1</superscript> at a power density of 800 W kg <superscript>-1</superscript> and a considerable cycling stability with 81.8% capacitance retention after 5000 cycles at 5 A g <superscript>-1</superscript> . The ZnMoO <subscript>4</subscript> /CoO nanohybrid demonstrates its tremendous advantages and possibilities as a positive electrode material in energy storage applications. Moreover, for a better understanding of the electrochemical behavior, a combined study of experimental measurements and density functional theory calculations is also applied to illustrate the high-performance of the ZnMoO <subscript>4</subscript> /CoO nanohybrid.
Details
- Language :
- English
- ISSN :
- 2040-3372
- Volume :
- 11
- Issue :
- 28
- Database :
- MEDLINE
- Journal :
- Nanoscale
- Publication Type :
- Academic Journal
- Accession number :
- 31290908
- Full Text :
- https://doi.org/10.1039/c9nr03784e