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
Chemistry Department, King Fahd University of Petroleum & Minerals, Dharan, 31261, Kingdom of Saudi Arabia.
Physics Department, King Fahd University of Petroleum & Minerals, Dharan, 31261, Kingdom of Saudi Arabia.
Chemistry. 2021 Apr 21;27(23):6973-6984. doi: 10.1002/chem.202005156. Epub 2021 Mar 17.
Tungsten oxide/graphene hybrid materials are attractive semiconductors for energy-related applications. Herein, we report an asymmetric supercapacitor (ASC, HRG//m-WO ASC), fabricated from monoclinic tungsten oxide (m-WO ) 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 H SO ) using three- and two-electrode systems. The HRG//m-WO ASC exhibits a maximum specific capacitance of 389 F g at a current density of 0.5 A g , with an associated high energy density of 93 Wh kg at a power density of 500 W kg in a wide 1.6 V operating potential window. In addition, the HRG//m-WO ASC displays long-term cycling stability, maintaining 92 % of the original specific capacitance after 5000 galvanostatic charge-discharge cycles. The m-WO nanoplates were prepared hydrothermally while HRG was synthesized by a modified Hummers method.
氧化钨/石墨烯混合材料是用于能源相关应用的有吸引力的半导体。在此，我们报道了一种不对称超级电容器（ASC，HRG//m-WO ASC），它由单斜氧化钨（m-WO）纳米片作为负极和高度还原的氧化石墨烯（HRG）作为正极材料制成。使用三电极和两电极系统在水性电解质（1 m H₂SO₄）中评估了制备电极的超级电容器性能。HRG//m-WO ASC在电流密度为0.5 A g⁻¹时表现出389 F g⁻¹的最大比电容，在1.6 V宽工作电位窗口下，在功率密度为500 W kg⁻¹时具有93 Wh kg⁻¹的相关高能量密度。此外，HRG//m-WO ASC显示出长期循环稳定性，在5000次恒电流充放电循环后保持原始比电容的92％。m-WO纳米片通过水热法制备，而HRG通过改进的Hummers法合成。
