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Citation: Jiang Xiong. An Investigation on the Cathodic Reduction of Co²⁺ Ions[J]. Acta Physico-Chimica Sinica, ;1993, 9(01): 129-133. doi: 10.3866/PKU.WHXB19930124 shu

An Investigation on the Cathodic Reduction of Co²⁺ Ions

Jiang Xiong

1.
Department of Chemsitry, South China Normal Univeristy, Guangzhou 510631

Received Date: 28 September 1991
Available Online: 15 February 1993

The cathodic reduction of Co~(2+) ions in solutions of pH 4—6 has been inves-tigated by using polarization measurements and ac impedance technique. The reduction behaviour depends to a great extent on the acidity of solution. Based on the mechanism proposed, which is characterized by a stepwise reduction and the inter-mediate formation of an adsorbed monovalent cobalt, (CoOH)_(ads), and with the reaction sequence as a model, an impedance analysis is made of the electrode process. The consistency of the conclution derived from the analysis with experimental electrochemical impedance spectroscopy (EIS) further confirms the reasonableness of the proposed mechanism. The present impedance study also gives evidence that there exists no one-to-one correspondence between a given reaction path (mechanism) and a certain mode of EIS, as ascertained by Cao~[12], and the method of equivalent circuit is limited in studying reaction mechanism.
- Cobalt(II) ions; Cathodic reduction; Electrochemical impedance spectroscopy; Reaction mechanism
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An Investigation on the Cathodic Reduction of Co²⁺ Ions