Rathore, HK and Hariram, M and Awasthi, K and Kumar, M and Sarkar, D and Ganesha, MK and Singh, AK and Das, D and Shukla, A (2022) Partially carbonized tungsten oxide as electrode material for asymmetric supercapacitors. In: Journal of Solid State Electrochemistry, 26 (9). pp. 2039-2048.
|
PDF
jou_sol_sta_ele_26-9_2039-2048_2022.pdf - Published Version Download (1MB) | Preview |
Abstract
Synthesis of partially carbonized tungsten oxide employing a simple, one-step, and scalable in-situ reduction/carbonization process is reported along with its electrochemical performance as electrode material in an asymmetric supercapacitor. The synthesis produces a WO2/W2C composite where the carbide part is introduced to enhance the electronic conductivity of redox-active tungsten oxide. Electrochemical performance and charge storage mechanism of WO2/W2C heterostructure is elucidated in detail. The electrode material exhibits compelling areal capacitance within −0.3 to −1 V window in half-cell configuration. Notably, both surface-controlled and diffusion-controlled processes govern the charge storage behavior, with the former dominating at higher scan rates. An asymmetric supercapacitor assembled with WO2/W2C composite as a negative electrode and activated charcoal (AC) as a positive electrode exhibits good cycling stability within a stable voltage window of 0.2 to 1.4 V and could deliver an energy density of 0.6 mWh/cm3 at a power density of 9 mW/cm3 in aqueous electrolyte. This study thus provides a fundamental understanding of the charge storage mechanism in WO2/W2C composite electrode which is required for realizing futuristic energy storage devices with low cost but efficient electroactive materials.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Solid State Electrochemistry |
| Publisher: | Springer Science and Business Media Deutschland GmbH |
| Additional Information: | The copyright for this article belongs to the Springer Science and Business Media Deutschland GmbH. |
| Keywords: | Carbides; Electrochemical electrodes; Electrolytes; Energy storage; Oxides; Process control; Redox reactions; Storage (materials); Supercapacitor; Tungsten compounds, Aqueous asymmetric supercapacitor; Asymmetric supercapacitor; Charge storage; Charge-storage mechanism; Composite heterostructure; Partially carbonized tungsten oxide; Redox capacitance; Storage mechanism; Surface-controled redox capacitance; Tungsten oxide, Capacitance |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 06 Oct 2022 09:30 |
| Last Modified: | 06 Oct 2022 09:30 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77182 |
Actions (login required)
 |
View Item |
