Thalji, Mohammad R. and Ali, Gomaa A. M. and Shima, Jae Jin and Chong, Kwok Feng (2023) Cobalt-doped tungsten suboxides for supercapacitor applications. Chemical Engineering Journal, 473 (145341). pp. 1-15. ISSN 1385-8947. (Published)
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Abstract
A crucial hurdle in developing supercapacitors is the creation of metal oxides with nanoscale structures that possess improved chemically active surfaces, ion/charge transport kinetics, and minimized ion-diffusion pathways. A metal-doping strategy to produce oxygen vacancies and increase electrical conductivity has proven effective for designing high-performance materials for energy storage devices. Herein, cobalt-doped tungsten suboxide (Co-doped W18O49) is grown on carbon cloth (CC) using a solvothermal approach and used as an electrode material for supercapacitor applications for the first time. Through this strategy, structurally distorted W18O49 is obtained by detecting a more apparent amorphous area caused by forming more oxygen vacancies with the bending of the lattice fringes. Benefiting from the synergy of more oxygen vacancies, increased lattice spacing, a high specific surface area, and accelerated ion diffusion, the Co-doped W18O49/CC electrode achieves a specific capacity of 475 C g−1 (792 F g−1) at a current density of 1.0 A g−1, which is superior to that of the undoped W18O49/CC (259 C g−1, 432 F g−1) and among the highest reported to date. Interestingly, the asymmetric supercapacitor device assembled using Co-doped W18O49/CC//AC/CC can provide a high energy density of 35.0 Wh kg−1. This strategy proves that the distortion of the W18O49 structure by Co doping improves the ion storage performance and self-discharge behavior. Also, it can enhance the energy storage performance of other electrode materials.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Al3+ electrolyte; Cobalt-doping; Lattice distortion; Oxygen vacancies; Self-discharge; Supercapacitor; Tungsten suboxide |
| Subjects: | Q Science > Q Science (General) T Technology > TP Chemical technology |
| Faculty/Division: | Faculty of Industrial Sciences And Technology Centre for Advanced Intelligent Materials |
| Depositing User: | Mrs Norsaini Abdul Samat |
| Date Deposited: | 22 Jul 2024 04:48 |
| Last Modified: | 22 Jul 2024 04:48 |
| URI: | http://umpir.ump.edu.my/id/eprint/42032 |
| Download Statistic: | View Download Statistics |
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