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Engineering of Nanostructured WO 3 Powders for Asymmetric Supercapacitors.
- Source :
-
Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2022 Nov 24; Vol. 12 (23). Date of Electronic Publication: 2022 Nov 24. - Publication Year :
- 2022
-
Abstract
- Transition metal oxide nanostructures are promising materials for energy storage devices, exploiting electrochemical reactions at nanometer solid-liquid interface. Herein, WO <subscript>3</subscript> nanorods and hierarchical urchin-like nanostructures were obtained by hydrothermal method and calcination processes. The morphology and crystal phase of WO <subscript>3</subscript> nanostructures were investigated by scanning and transmission electron microscopy (SEM and TEM) and X-ray diffraction (XRD), while energy storage performances of WO <subscript>3</subscript> nanostructures-based electrodes were evaluated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests. Promising values of specific capacitance (632 F/g at 5 mV/s and 466 F/g at 0.5 A/g) are obtained when pure hexagonal crystal phase WO <subscript>3</subscript> hierarchical urchin-like nanostructures are used. A detailed modeling is given of surface and diffusion-controlled mechanisms in the energy storage process. An asymmetric supercapacitor has also been realized by using WO <subscript>3</subscript> urchin-like nanostructures and a graphene paper electrode, revealing the highest energy density (90 W × h/kg) at a power density of 90 W × kg <superscript>-1</superscript> and the highest power density (9000 W/kg) at an energy density of 18 W × h/kg. The presented correlation among physical features and electrochemical performances of WO <subscript>3</subscript> nanostructures provides a solid base for further developing energy storage devices based on transition metal oxides.
Details
- Language :
- English
- ISSN :
- 2079-4991
- Volume :
- 12
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- Nanomaterials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 36500791
- Full Text :
- https://doi.org/10.3390/nano12234168