...To break the equilibrium of an electrode system, it is necessary to apply energy sufficient to overcome the following phenomena, and overvoltages can be classified according to their causes as follows: (1) Activation energy of the electrode reaction (activation overvoltage), (2) Change in concentration of reaction-related substances on the electrode surface as the reaction progresses (concentration overvoltage), (3) If a film is formed on the electrode surface as a result of the reaction, the ohmic drop (equal to IR ) due to the electrical resistance R of the film (resistance overvoltage). These overvoltages vary depending on the type of electrode reaction, the material and surface condition of the electrode, the current density, temperature, pressure, etc. ... *Some of the terminology that refers to "activation overvoltage" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…電極系の平衡を破るには次のような現象に打ち勝つだけのエネルギーを加える必要があり,それらの原因に応じて過電圧を次のように分類することができる。(1)電極反応の活性化エネルギー(活性化過電圧),(2)反応進行に伴って電極面に生ずる反応関与物質の濃度変化(濃度過電圧),(3)反応の結果として電極面に皮膜の生成などがあれば,皮膜の電気抵抗Rによるオーム降下(IRに等しい)など(抵抗過電圧)。これらの過電圧は,電極反応の種類,電極の材質や表面状態,電流密度,温度,圧力などで変化する。… ※「活性化過電圧」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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