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Electrochemical Impedance Spectroscopy Part 1: Fundamentals (Presentation File)

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posted on 07.11.2022, 04:37 authored by Kingo Ariyoshi, Zyun SIROMA, Atsushi MINESHIGE, Mitsuhiro TAKENO, Tomokazu FUKUTSUKA, Takeshi ABE, Satoshi UCHIDA

 This supplementary material is a part of the presentation handout, pages 133–154, for the 51st Electrochemistry Workshop entitled “Fundamentals and New Approaches to Electrochemistry” organized by Kansai Branch of the Electrochemical Society of Japan on November 14–18, 2022 to be distributed at the workshop. / Electrochemical impedance spectroscopy (EIS) enables the examination of the electrochemical nature of electrodes and electrochemical cells by applying an alternating voltage (or current) and measuring the resulting current (or voltage). The resistance and capacitance components of the electrode can be evaluated by applying an AC voltage and changing the frequency. In particular, analysis using the equivalent circuit can determine important parameters related to the electrochemical reaction of the electrode, such as the charge transfer resistance, electric double-layer capacitance, and Warburg impedance. Moreover, the internal resistance of the cell can be divided into resistances caused by the positive electrode, negative electrode, and electrolyte. Because of these advantages, EIS is a powerful technique used for basic research, such as in identifying the rate-determining step of an electrochemical reaction, and also for applied research, such as characterizing electrochemical devices (e.g., batteries and capacitors). In this paper, the concept of impedance, which represents the relationship between the AC voltage and current, is first explained; then, the AC characteristics of various circuit elements used in equivalent circuits, which are essential for understanding EIS, are described. Finally, treatments of more complex circuits based on transmission-line models (TLMs), which are used to represent equivalent circuits of porous electrodes, are presented. Analyses based on TLMs are the foundation for understanding electrodes for practical applications because porous electrodes are usually used in electrochemical devices. 


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第51回電気化学講習会「電気化学の基礎と新しいアプローチ」 (主催:電気化学会関西支部・2022年11月14–18日) 配付資料, pp.133–154 / 電気化学インピーダンス分光法 (Electrochemical impedance spectroscopy; EIS) は,交流電圧 (または電流) を印加し,得られた電流 (または電圧) を測定することにより電極や電気化学セルの電気化学的性質を調べることができる.交流電圧を印加し,周波数を変化させることで,電極の抵抗成分や静電容量成分を評価することができる.特に等価回路を用いた解析では,電荷移動抵抗,電気二重層容量,ワールブルグインピーダンスなど,電極の電気化学反応に関わる重要なパラメーターを求めることができる.また,電池の内部抵抗を正極,負極,電解質に起因する抵抗に分けることができる.これらの利点から,EISは電気化学反応の速度決定段階を特定するような基礎研究にも,電池やキャパシタなどの電気化学デバイスの特性評価などの応用研究にも用いられる強力な技術である.本論文では,まず交流電圧と電流の関係を表すインピーダンスの概念について説明し,次にEISの理解に不可欠な等価回路に用いられる各種回路素子の交流特性について解説する.最後に,多孔質電極の等価回路を表現するために用いられる伝送線路モデル (transmission-line models; TLM) に基づく,より複雑な回路の取り扱いを紹介する.多孔質電極は通常,電気化学デバイスに使用されるため,TLMに基づく解析は実用的な電極を理解するための基礎となる.

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有吉欽吾・城間 純・嶺重 温・武野光弘・福塚友和・安部武志・内田悟史


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