A High‐Performance Asymmetric Supercapacitor Based on Tungsten Oxide Nanoplates and Highly Reduced Graphene Oxide Electrodes

• Published in: Chemistry : a European journal 2021-04, Vol.27 (23), p.6973-6984
• Main Authors: Ashraf, Muhammad, Shah, Syed Shaheen, Khan, Ibrahim, Aziz, Md. Abdul, Ullah, Nisar, Khan, Mujeeb, Adil, Syed Farooq, Liaqat, Zainab, Usman, Muhammad, Tremel, Wolfgang, Tahir, Muhammad Nawaz
• Format: Article
• Language: English
• Subjects: Aqueous electrolytes; Asymmetry; Capacitance; Chemistry; electrochemistry; Electrode materials; Electrodes; Electronics industry; energy storage; Flux density; Graphene; high energy density; highly reduced graphene oxide; Sulfuric acid; Supercapacitors; Tungsten; Tungsten oxide; Tungsten oxides
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.202005156

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 H2SO4) using three‐ and two‐electrode systems. The HRG//m‐WO3 ASC exhibits a maximum specific capacitance of 389 F g−1 at a current density of 0.5 A g−1, with an associated high energy density of 93 Wh kg−1 at a power density of 500 W kg−1 in a wide 1.6 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. Two dimensional nanomaterials: An asymmetric supercapacitor (ASC, HRG//m‐WO3 ASC) fabricated from tungsten oxide (m‐WO3) nanoplates as a negative electrode and highly reduced graphene oxide (HRG) as a positive electrode material attains specific capacitance of 389 F g−1 at a current density of 0.5 A g−1, with an associated high energy density of 93 Wh kg−1 at a power density of 500 W kg−1 in a wide 1.6 V operating potential window. In addition, the HRG//m‐WO3 ASC displays long‐term cycling‐stability, maintaining around 92 % of the original specific capacitance after 5000 galvanostatic charge–discharge cycles.