A High-Performance Asymmetric Supercapacitor Based on Tungsten Oxide Nanoplates and Highly Reduced Graphene Oxide Electrodes.
Chemistry
; 27(23): 6973-6984, 2021 Apr 21.
Article
em En
| MEDLINE
| ID: mdl-33609404
ABSTRACT
Tungsten oxide/graphene hybrid materials are attractive semiconductors for energy-related applications. Herein, we report an asymmetric supercapacitor (ASC, HRG//m-WO3 ASC), fabricated from monoclinic tungsten oxide (m-WO3 ) nanoplates as a negative electrode and highly reduced graphene oxide (HRG) as a positive electrode material. The supercapacitor performance of the prepared electrodes was evaluated in an aqueous electrolyte (1 m H2 SO4 ) using three- and two-electrode systems. The HRG//m-WO3 ASC exhibits a maximum specific capacitance of 389â
F g-1 at a current density of 0.5â
A g-1 , with an associated high energy density of 93â
Wh kg-1 at a power density of 500â
W kg-1 in a wide 1.6â
V operating potential window. In addition, the HRG//m-WO3 ASC displays long-term cycling stability, maintaining 92 % of the original specific capacitance after 5000 galvanostatic charge-discharge cycles. The m-WO3 nanoplates were prepared hydrothermally while HRG was synthesized by a modified Hummers method.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article