Increasing the Electrochemical Activity of the Pr1.95La0.05CuO4 Cathode by Laser Modification of the Electrode/Electrolyte Interface Profile

• Published in: Russian journal of electrochemistry 2022-02, Vol.58 (2), p.93-99
• Main Authors: Lyskov, N. V., Galin, M. Z., Napol’skii, Ph. S., Mazo, G. N.
• Format: Article
• Language: English
• Subjects: Cathodes; Cathodic polarization; Chemistry; Chemistry and Materials Science; Columnar structure; Electrochemical analysis; Electrochemistry; Electrode materials; Electrode polarization; Electrolytes; Electrolytic cells; Laser processing; Lasers; Oxygen reduction reactions; Physical Chemistry; Solid electrolytes; Solid oxide fuel cells; Topology
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193522020070

The influence of the Ce 0.9 Gd 0.1 O 1.95 solid electrolyte surface topology formed by laser processing on the electrochemical activity of the Pr 1.95 La 0.05 CuO 4 cathode material in oxygen reduction reaction is studied. The ordered columnar structure of Ce 0.9 Gd 0.1 O 1.95 with a depth of the relief profile of ~11–12 µm is shown to be the most preferable with respect to the achieving of higher electrochemical activity. A twofold decrease in the polarization resistance of the Pr 1.95 La 0.05 CuO 4 cathode material from 0.87 Ω cm 2 (the initial sample) to 0.40 Ω cm 2 (the modified Ce 0.9 Gd 0.1 O 1.95 surface) at a temperature of 700°C in air was observed upon the transition from the Ce 0.9 Gd 0.1 O 1.95 solid electrolyte initial surface to the modified one. Based on the data obtained, the application of the laser processing for the formation of a preset topology of the electrode/electrolyte interface can be considered as an effective technological approach that allows increasing the electrochemical performance of solid oxide fuel cells.