High mass loading of h-WO3 and α-MnO2 on flexible carbon cloth for high-energy aqueous asymmetric supercapacitor

• Published in: Electrochimica acta Vol. 299; pp. 245 - 252
• Main Authors: Ji, Su-Hyeon, Chodankar, Nilesh R., Jang, Woo-Sung, Kim, Do-Heyoung
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 10.03.2019; Elsevier BV
• Subjects: Asymmetric supercapacitor; Asymmetry; Carbon; Cloth; Computer storage devices; Electrochemical analysis; Electrode materials; Electrodes; Electronic devices; Electronic systems; Energy; Energy storage; Flux density; High mass loading; Manganese dioxide; Nanorods; Nanowires; Portable equipment; Product development; Sodium sulfate; Supercapacitors; Tungsten oxide; Tungsten oxides; High mass loading; Tungsten oxide; Asymmetric supercapacitor
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2018.12.187

The increasing interest in portable and consumable electronics demands efficient and low-cost energy storage devices with excellent energy storing capacity. From this point, a high mass loading of the active electrode material on three-dimensional current collectors is favorable for obtaining a higher energy storing capacity for the corresponding device. The present study demonstrates an ideal example of high-performance aqueous asymmetric supercapacitors (SCs) using α-MnO2 nanowires as the positive electrode and h-WO3 nanorods as the negative electrode, respectively. Initially, one-dimensional (1D) nanostructures composed of α-MnO2 and h-WO3 are prepared on carbon cloth by a conventional hydrothermal method. The prepared α-MnO2 and h-WO3 with a high mass loading of 4.9 mg/cm2 and 5.8 mg/cm2, respectively, show excellent electrochemical features in aqueous Na2SO4 electrolyte in the positive and negative potential regions. A high-performance asymmetric SC is developed with uniquely engineered electrodes, which exhibits the excellent electrochemical performance in an extended potential window of 1.4 V and with excellent cycling stability of ∼135% after 7500 cycles with a volumetric capacitance of 350 mF/cm3 and energy density of 0.095 mWh/cm3. This authentic scheme may offer new opportunities for developing asymmetric arrangements for energy storage devices in various portable electronic systems with a high mass loading. In this study, h-WO3 nanorods and α-MnO2 nanowires were grown on carbon cloth and used to assemble an all-pseudocapacitive asymmetric supercapacitor. The developed device showed good electrochemical performance with cycling stability. [Display omitted] •Binder-less approach was used to prepare high-mass loaded h-WO3 and α-MnO2 on flexible CC.•The all-pseudocapacitive α-MnO2//h-WO3 asymmetric supercapacitor device showed a high energy density of 0.095 mWh/cm3.•The device exhibited excellent rate capability and long-term cycling stability over 7500 cycles without decrement.