A High-Performance Asymmetric Supercapacitor Based on Tungsten Oxide Nanoplates and Highly Reduced Graphene Oxide Electrodes |
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| Authors: | Muhammad Ashraf Syed Shaheen Shah Dr. Ibrahim Khan Dr. Md. Abdul Aziz Prof. Nisar Ullah Dr. Mujeeb Khan Dr. Syed Farooq Adil Zainab Liaqat Dr. Muhammad Usman Prof. Wolfgang Tremel Dr. Muhammad Nawaz Tahir |
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| Affiliation: | 1. Chemistry Department, King Fahd University of Petroleum & Minerals, Dharan, 31261 Kingdom of Saudi Arabia;2. Physics Department, King Fahd University of Petroleum & Minerals, Dharan, 31261 Kingdom of Saudi Arabia;3. Center of Integrative Petroleum Research, King Fahd University of Petroleum & Minerals, Dhahran, 31261 Saudi Arabia;4. Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran, 31262 Saudi Arabia;5. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451 Kingdom of Saudi Arabia;6. Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10–14, 55128 Mainz, Germany |
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| 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 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. |
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| Keywords: | electrochemistry energy storage high energy density highly reduced graphene oxide supercapacitors |
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