Effect of monovalent ion electrolyte on energy storage mechanism of nanocomposites TiO2@CNTs

Nguyen Huynh Le Thanh, Trang Le Nguyen Thao, Quynh Nguyen Thi Nhu, Trang Nguyen Thi Thu, Hai Le Viet, Hoang Nguyen Thai, Nam Pham Thi, Lam Tran Dai, Lu Le Trong

Abstract


Electrolyte plays the vital role of carrying ions in the operation of chemical power sources. In this work, the lithium, sodium and posstasium-based aqueous electrolytes were performed in the supercapacitor using nano TiO2 electrode. The anataste phase TiO2 was prepared via sol-gel route, which were charaterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Thermogravimetric analysis (TGA), and Raman. The electrochemical behaviors were conducted by cyclic voltammetry and charge-discharge cycling test. Electrochemical results showed TiO2@CNTs exhibited the pseudocapacitor behavior through the quasi-rectangle voltammetry, the maximum capacity achived using Li2SO4 1M is 245 F/g and Na2SO4 1M is 168 F/g at scan rate of 5 mV/s.

Keywords


Electrolyte; capacitance; TiO2; supercapacitor

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References


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DOI: https://doi.org/10.51316/jca.2021.136

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