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Electrocatalytic activity of La0.6Sr0. 4Co1-yCuyO3 (y = 0.1, 0.2, and 0.3) for oxygen evolution in an alkaline medium at 25°C

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Title Electrocatalytic activity of La0.6Sr0. 4Co1-yCuyO3 (y = 0.1, 0.2, and 0.3) for oxygen evolution in an alkaline medium at 25°C
 
Creator Lal, Basant
Chauhan, Pankaj
Srivastava, Anupam
 
Subject Electrocatalysis
Cyclic voltammetry
Tafel-polarization
Perovskite-type oxide
Oxygen evolution reaction
 
Description 875-881
Binary metal substituted lanthanum cobaltate viz., La0.6Sr0.4Co1-yCuyO3 (y = 0.1, 0.2, and 0.3) have been prepared by solgel
method using alginic acid as a precursor and characterized by the TGA, IR, XRD, and SEM techniques. They have also
been studied for their electrochemical performance towards the electrocatalytic splitting of water in an alkaline medium.
Recorded cyclic voltammetry of the oxide electrodes on nickel support show a pair of oxidation-reduction peaks in the
anodic peak potential region (Epa ≈ 508-553 mV) and in the cathodic peak potential region (Epc ≈ 305-322 mV). The
polarization curves of each oxide electrode with Tafel slope (b) range from 95 to 101 mV dec–1, and the apparent current
density (ja) ranges from 31 to 45 mA cm–2 at 0.7 V. Doping of copper in a La0.6Sr0.4CoO3 matrix improves the
electrocatalytic activity for the oxygen evolution reaction in an alkaline solution. The observed values of the reaction order
with respect to the concentration change of [OH –] are unity, and the strongly negative value of the reaction entropy indicates
that the electrocatalytic oxygen evolution by water splitting occurs by the same mechanism involving the adsorption
phenomenon of reaction intermediates on the electrode surface.
 
Date 2024-09-24T12:22:10Z
2024-09-24T12:22:10Z
2024-09
 
Type Article
 
Identifier 2583-1321 (Online); 0019-5103 (Print)
http://nopr.niscpr.res.in/handle/123456789/64592
https://doi.org/10.56042/ijc.v63i9.10838
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJC Vol.63(09) [September 2024]