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Electrocatalytic properties of La1-xCuxCoO3 (0 ≤ x ≤ 0.8) film electrodes prepared by Malic Acid sol-gel method at pH=3.75.

Singh, N.K.; Yadav, M.K.; Fernandez, Carlos


N.K. Singh

M.K. Yadav


La-based Perovskite-type oxides with composition La1-xCuxCoO3 (0 ≤ X ≤ 0.8) have been synthesized by malic acid sol-gel low temperature route at pH 3.75. In each preparation, nitrate salts of lanthanum, copper, cobalt and malic acid were taken as starting material. The pH of the solution was adjusted by using ammonia solution. Techniques used to know the physical properties of the materials were scanning electron microscope (SEM) powder X-ray diffraction (XRD). All the electrochemical viza cyclic voltammetry, roughness factor and anodic polarization studies have been performed in three electrode single compartment glass cell. For the purpose, materials were transferred in the form of oxide film electrode on Ni conducting support. XRD data showed the formation of almost pure phase of the material with hexagonal crystal geometry. The cyclic voltammetric study showed that each oxide electrode exhibited a pair of redox peaks prior to the oxygen evolution reaction (OER). The values of Tafel slope (78-90 mV decade-1) and reaction order (~ 1) indicate that each catalyst follows similar mechanistic path. The data of anodic polarization study shows that the substitution of Cu in place of La in the base oxide increases the electrocatalytic activity considerably. The value was found to be highest with 0.4 mol Cu substitution. Electrochemically active area of the material was determined in terms of roughness factor by recording the cyclic voltammograms at different scan rates in the potential region 0.0-0.1V. The roughness factor was observed to be highest with 0.2 mol Cu-substituted oxide.


SINGH, N.K., YADAV, M.K. and FERNANDEZ, C. 2017. Electrocatalytic properties of La1-xCuxCoO3 (0 ≤ x ≤ 0.8) film electrodes prepared by Malic Acid sol-gel method at pH=3.75. International journal of electrochemical science [online], 12(8), pages 7128-7141. Available from:

Journal Article Type Article
Acceptance Date Jun 12, 2017
Online Publication Date Jul 12, 2017
Publication Date Aug 30, 2017
Deposit Date Nov 2, 2017
Publicly Available Date Nov 2, 2017
Journal International journal of electrochemical science
Electronic ISSN 1452-3981
Publisher Electrochemical Science Group
Peer Reviewed Peer Reviewed
Volume 12
Issue 8
Pages 7128-7141
Keywords Perovskitetype oxide; Malic acid solgel; XRD; Electrocatalytic activity; Thermodynamic parameters; Roughness factor
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