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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

Authors

N.K. Singh

M.K. Yadav

Carlos Fernandez

Abstract

La-based Perovskite-type oxides with composition La1-xCuxCoO3 (0 ≤ x ≤ 0.8) were 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. Scanning electron microscope (SEM) powder X-ray diffraction (XRD) was used to identify the physical properties of the materials. All the electrochemical viza cyclic voltammetry, roughness factor and anodic polarization studies were performed in three electrode single compartment glass cells. Materials were transferred in the form of oxide film electrode on a Ni conducting support. XRD data showed the formation of an 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 (similar to 1) indicate that each catalyst follows similar mechanistic path. The data of the 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 areas of the material were 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.

Journal Article Type Article
Publication Date Aug 30, 2017
Journal International journal of electrochemical science
Publisher New Publisher Required
Peer Reviewed Peer Reviewed
Volume 12
Issue 8
Pages 7128-7141
Institution Citation 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: https://doi.org/10.20964/2017.08.68
DOI https://doi.org/10.20964/2017.08.68
Keywords Perovskitetype oxide; Malic acid solgel; XRD; Electrocatalytic activity; Thermodynamic parameters; Roughness factor

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