Analysis of impedance spectroscopy of aqueous supercapacitors by evolutionary programming: Finding DFRT from complex capacitance

被引：56
|
作者：
Oz, Alon [1 ]
Hershkovitz, Shany [2 ]
Belman, Nataly [3 ]
Tal-Gutelmacher, Ervin [3 ]
Tsur, Yoed [2 ]
机构：
[1] Technion Israel Inst Technol, Nancy & Stephen Grand Technion Energy Program, IL-3200003 Haifa, Israel
[2] Technion Israel Inst Technol, Dept Chem Engn, IL-3200003 Haifa, Israel
[3] Elbit Syst Land & C4I Ltd, IL-42507 Netanya, Israel
来源：
SOLID STATE IONICS | 2016年 / 288卷
基金：
以色列科学基金会;
关键词：
Impedance spectroscopy; Complex capacitance; Aqueous supercapacitors; Distribution of relaxation times; CARBONS; PERFORMANCE; DEVICES;
D O I：
10.1016/j.ssi.2015.11.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Electrochemical impedance spectroscopy (EIS) of aqueous-electrolyte supercapacitors can shed light on the physical processes occurring within the cell, given a proper analysis technique. Impedance Spectroscopy Genetic Programming (ISGP) is a novel technique to analyze EIS data. ISGP finds a functional form of the distribution of relaxation times utilizing genetic algorithm and offers a detailed quantitative analysis. In this work, EIS data of aqueous-electrolyte supercapacitors were analyzed by transforming the data to complex capacitance representation. A distribution function of relaxation times (DFRT) model was obtained, comprised of two peaks, each correlated with a different physical process (diffusion and EDLC formation). Two cell configurations were examined and the differences regarding capacitance distribution and diffusion rates are presented. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：311 / 314
页数：4
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