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Cyclic Voltammetry Part 2: Surface Adsorption, Electric Double Layer, and Diffusion Layer (Presentation File)

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posted on 07.11.2022, 04:38 authored by Hirohisa YAMADA, Kazuki YOSHII, Masafumi ASAHI, Masanobu CHIKU, Yuki KITAZUMI

 This supplementary material is a part of the presentation handout, pages 109–132, 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. / This paper “Part 2: Surface Adsorption, Electric Double Layer, and Diffusion Layer” is the applicational part and is a continuation of “Part 1: Fundamentals” (https://doi.org/10.5796/electrochemistry.22-66082). This part explains the principles of cyclic voltammetry on adsorption, electric double layer, and diffusion layer with microelectrodes. Moreover, recent trends, such as polymer electrolyte fuel cells (PEFCs), electric double layer capacitors (EDLCs), and sensors, are highlighted. The relationship between the electrochemical surface area (ECSA) and electric quantity estimated on the basis of cyclic voltammograms is explained in the chapter on adsorption, where the adsorption of hydrogen and carbon monoxide on Pt is discussed. The following chapter introduces the pseudo-capacitance of activated carbon, which exhibits characteristic capacitor-like behavior, with Faradaic current flow on the surface. Finally, an explanation concerning the effect of diffusion-limiting currents on two types of microelectrodes and a practical case of enzyme sensing using a microelectrode is included. 


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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.109–132 /本論文(その2:表面吸着・電気二重層・拡散層) は (その1:基礎編 https://doi.org/10.5796/electrochemistry.22-66082) の続きとなる応用編である.このパートでは,微小電極を用いた吸着,電気二重層,拡散層に関するサイクリックボルタンメトリーの原理を解説する.さらに,固体高分子形燃料電池 (PEFC),電気二重層キャパシタ (EDLC),センサーなどの最近の動向についても取り上げる.電気化学的表面積 (ECSA)とサイクリックボルタンモグラムに基づいて推定される電気量の関係については,吸着の章で水素と一酸化炭素のPtへの吸着について説明されている.次章では,活性炭の擬似静電容量について紹介する.活性炭は,表面にファラデー的な電流が流れ,特徴的なコンデンサ的な挙動を示すことが知られている.最後に,2種類の微小電極における拡散制限電流の影響と,微小電極を用いた酵素センシングの実用例について説明する.

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