TY - JOUR

T1 - Adjusting electrochemical properties of PrBaCo2O6–δ as SOFC cathode by controllable Ca3Co4O9 additions

AU - Yurchenko, M.

AU - Antonova, E.

AU - Tropin, E.

AU - Suntsov, A.

N1 - The authors are grateful to the Russian Ministry of Science and Education for the support of this work under contracts AAAA-A19-119110190048-7 and 122020100324–3.

PY - 2023/7/1

Y1 - 2023/7/1

N2 - Composite electrode materials were successfully obtained by mixing of PrBaCo2O6–δ (PBCO) and Ca3Co4O9±δ (CCO) oxides. No interactions between the components under long term sintering and SOFC's operating conditions were evidenced by means of x-ray diffraction analysis. Increase of CCO content is shown to contribute to the perceptible decline in thermal expansion coefficients in the background of a negligible decrease in electrical conductivity of ceramics. The obtained powdered composites are shown to possess a developed microstructure and an excellent adhesion with Ce0.8Sm0.2O1.9 dense support. Low values of polarization resistances equal 0.28 and 0.69 Ω∙cm2 at 873 K were achieved for compositions with 70% and 50% of the PBCO phase, respectively. The distribution relaxation times (DRT) method was implemented to reveal the rate-limiting steps of the electrochemical reaction. The applying of CCO as TEC lowering admixture to PBCO instead ceria-based oxides was demonstrated to be more effective approach.

AB - Composite electrode materials were successfully obtained by mixing of PrBaCo2O6–δ (PBCO) and Ca3Co4O9±δ (CCO) oxides. No interactions between the components under long term sintering and SOFC's operating conditions were evidenced by means of x-ray diffraction analysis. Increase of CCO content is shown to contribute to the perceptible decline in thermal expansion coefficients in the background of a negligible decrease in electrical conductivity of ceramics. The obtained powdered composites are shown to possess a developed microstructure and an excellent adhesion with Ce0.8Sm0.2O1.9 dense support. Low values of polarization resistances equal 0.28 and 0.69 Ω∙cm2 at 873 K were achieved for compositions with 70% and 50% of the PBCO phase, respectively. The distribution relaxation times (DRT) method was implemented to reveal the rate-limiting steps of the electrochemical reaction. The applying of CCO as TEC lowering admixture to PBCO instead ceria-based oxides was demonstrated to be more effective approach.

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85151538761

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=001010352700001

U2 - 10.1016/j.ceramint.2023.03.281

DO - 10.1016/j.ceramint.2023.03.281

M3 - Article

VL - 49

SP - 21485

EP - 21491

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 13

ER -