期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 165, 期 16, 页码 A4067-A4076出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0031902jes
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资金
- International Doctoral Innovation Centre
- Ningbo Education Bureau
- Ningbo Science and Technology Bureau
- University of Nottingham
- Ningbo Municipal Government (3315 Plan) [201501CX-C01006, 2014A35001-1]
Charge storage through electric double layer (EDL) charging of activated carbon (AC) and redox reactions of iodide and bromide ions in aqueous electrolytes and at the AC vertical bar electrolyte interface has been investigated by cyclic voltammetry and galvanostatic charging and discharging. Electrochemical experiments were carried out in both the three-electrode and two-electrode cells with the latter resembling the so-called supercapacitor-battery hybrid or simply supercapattery. By comparing the electrochemical behavior of bromide and iodide ions used as dissolved redox species (DRS), some observed features of the supercapattery are described and analyzed from the standpoint of the EDL charging of the AC electrodes, the thermodynamics and kinetics of the electrode reactions of the DRS, and the adsorption and transport of the charging reaction products. Furthermore, the effect of capacitance unequalization was explored for the adequate utilization of the charge storage from both the DRS and EDL contributions. It is also shown that counter-electrode oversizing has to be critically appraised for the design of optimal devices. (C) The Author(s) 2018. Published by ECS.
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