Evaluation of Ce-doped Pr2CuO4 for potential application as a cathode material for solid oxide fuel cells

L. M. Kolchina, N. V. Lyskov, A. N. Kuznetsov, S. M. Kazakov, M. Z. Galin, A. Meledin, A. M. Abakumov, S. I. Bredikhin, G. N. Mazo, E. V. Antipov

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15 Citations (Scopus)

Abstract

Pr2-xCexCuO4 (x = 0.05; 0.1; 0.15) samples were synthesized and systematically characterized towards application as a cathode material for solid oxide fuel cells (SOFCs). High-temperature electrical conductivity, thermal expansion, and electrocatalytic activity in the oxygen reduction reaction (ORR) were examined. The electrical conductivity of Pr2-xCexCuO4 oxides demonstrates semiconducting behavior up to 900 °C. Small Ce-doping (2.5 at%) allows an increase in electrical conductivity from 100 to 130 S cm-1 in air at 500-800 °C. DFT calculations revealed that the density of states directly below the Fermi level, comprised mainly of Cu 3d and O 2p states, is significantly affected by atoms in rare earth positions, which might give an indication of a correlation between calculated electronic structures and measured conducting properties. Ce-doping in Pr2-xCexCuO4 slightly increases TEC from 11.9 × 10-6 K-1 for x = 0 to 14.2 × 10-6 K-1 for x = 0.15. Substitution of 2.5% of Pr atoms in Pr2CuO4 by Ce is effective to enhance the electrochemical performance of the material as a SOFC cathode in the ORR (ASR of Pr1.95Ce0.05CuO4 electrode applied on Ce0.9Gd0.1O1.95 electrolyte is 0.39 Ω cm2 at 750 °C in air). The peak power density achieved for the electrolyte-supported fuel cell with the Pr1.95Ce0.05CuO4 cathode is 150 mW cm-2 at 800 °C.

Original languageEnglish
Pages (from-to)101029-101037
Number of pages9
JournalRSC Advances
Volume6
Issue number103
DOIs
Publication statusPublished - 2016

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