Electrochemical cell studies based on non-aqueous magnesium electrolyte for electric double layer capacitor applications |
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| Authors: | Ramasamy Chandrasekaran Akiyoshi Yamauchi |
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| Affiliation: | a Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 Yamate-cho, Suita 564-8680, Japan
b Chemical Division, Fundamental Research Department, Daikin Industries Ltd., 1-1 Nishihitotsuya, Settsu 565-8585, Japan |
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| Abstract: | Performances of electric double layer capacitors (EDLCs) based on an activated carbon electrode with acetonitrile (ACN), propylene carbonate (PC), or a ternary electrolyte, i.e., PC:ethylene carbonate (EC):diethyl carbonate (DEC), at 1 mol dm−3 of magnesium perchlorate [Mg(ClO4)2] salt have been investigated. The electrochemical responses were studied by impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge experiments at 25 °C in a three-electrode configuration. For a comparative evaluation, lithium perchlorate (LiClO4) salt-based systems were also evaluated. All the observed results showed typical EDLC characteristics within the potential range between 0 and 1 V vs. an Ag/Ag+ reference electrode. The Mg-based systems exhibited similar or rather better performances than the corresponding Li-based electrolytes; in particular, the rate capability of Mg-based ACN and PC electrolytes was much better than the corresponding Li-based electrolytes, indicating the high accessibility and utility of activated carbon pores by solvated Mg ions. |
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| Keywords: | Electric double layer capacitor Non-aqueous magnesium electrolyte Lithium salt Activated carbon Specific capacitance |
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