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.
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Acknowledgements
H.K.R acknowledges Council of Scientific and Industrial Research (CSIR), Government of India, for the Research Fellowship (File no. 09/964(0032)/2020-EMR-I). D.S. acknowledges support from the Science and Engineering Research Board (SERB), Government of India, through the project SRG/2019/001211 and ISRO-RAC-S MNIT Jaipur through project RAC-S/PRO/21-22/02.
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Rathore, H.K., Hariram, M., Awasthi, K. et al. Partially carbonized tungsten oxide as electrode material for asymmetric supercapacitors. J Solid State Electrochem 26, 2039–2048 (2022). https://doi.org/10.1007/s10008-022-05196-w
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DOI: https://doi.org/10.1007/s10008-022-05196-w