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Al3+ ion intercalation pseudocapacitance study of W18O49 nanostructure

Thalji, Mohammad R. and Ali, Gomaa A. M. and Algarni, H. and Chong, Kwok Feng (2019) Al3+ ion intercalation pseudocapacitance study of W18O49 nanostructure. Journal of Power Sources, 438. pp. 1-8. ISSN 0378-7753

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Intercalation pseudocapacitance is of essential significance for designing high performance electrode materials, which offers exceptional charge storage characteristics. In this study, we elucidate the pseudocapacitive behavior of Al3+ ions intercalation within the distinctive tunnels of monoclinic W18O49 nanostructure. 3D sea urchin-like W18O49 is synthesized through one-step solvothermal approach. Its physicochemical properties are investigated by X-ray diffraction, X-ray photoelectron spectroscopy, Field emission scanning electron microscopy and Brunauer-Emmett-Teller surface area analysis. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques are used to investigate the electrochemical characteristics of W18O49 electrode in different electrolyte systems. It shows high specific capacitance of 350 F g−1 at 1 A g−1, superior electrochemical long-term stability in the Al3+ electrolyte with 92% capacitance retention at 8000 cycles. The excellent electrochemical performance is predominantly due to the Al3+ ions intercalation/de-intercalation with W18O49 nanostructure that is proven by ex situ X-ray diffraction analysis. The work marks a notable achievement in the effort of substituting commonly acidic proton electrolyte for W18O49 supercapacitor.

Item Type: Article
Additional Information: Indexed by SCOPUS
Uncontrolled Keywords: Intercalation pseudocapacitance; W18O49; Supercapacitors; Charge storage; Al3+ electrolyte
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Noorul Farina Arifin
Date Deposited: 27 Sep 2019 03:37
Last Modified: 02 Oct 2019 07:34
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