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Synthesis and Electrochemical Properties of Pr1-xSrCo0.5Ni0.5O4+δ Cathode Materials
Author NameAffiliationE-mail
LIU Jian-Wei Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China  
SUN Li-Ping Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China lipingsun98@yahoo.com 
ZHAO Hui Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China  
HUO Li-Hua Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China  
Abstract: Intermediate temperature solid oxide fuel cells (IT-SOFCs) cathode materials Pr1-xSrCo0.5Ni0.5O4+δ (P1-xSCN, x=0.0, 0.05, 0.10, 0.15, 0.20) are synthesized by solid-state reaction method. The phase, thermal expansion coefficient (TEC), conductivity, electrode morphology and electrochemical properties are characterized. XRD results show that the oxides crystallize in a single K2NiF4 structure with a space group of I4/mmm. The cathode materials exhibited good high temperature chemical compatibility with electrolyte Ce0.9Gd0.1O1.95 (CGO). Iodometry analysis shows that with the increase of Pr3+ vacancy concentration, the average valence of Co/Ni ions in oxides increased stepwise with the increase of x and then decreased after x=0.10, while the content of oxygen vacancy increased gradually. Introducing Pr3+ vacancy significantly improved the conductivity of the material. The highest conductivity of 309 S·cm-1 was found in P0.90SCN at 700℃ in air. The thermal expansion measurement results show that TEC increased with the increase of Pr3+ deficiency, and the maximum value is 1.51×10-5 K-1. Electrochemical impedance spectroscopy (EIS) measurements show that Pr vacancy significantly reduced the polarization resistance of the electrode, and the smallest polarization resistance of 0.21 Ω·cm2 was obtained on P0.90SCN cathode at 700℃ in air. The maximum output power density of electrolyte supported single cell NiO-CGO/CGO/P0.90SCN was 197.8 mW·cm-2 at 700℃.
Keywords: intermediate temperature solid oxide fuel cells  cathode materials  oxygen reduction reaction  Pr1-xSrCo0.5Ni0.5O4+δ
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LIU Jian-Wei,SUN Li-Ping,ZHAO Hui,HUO Li-Hua.Synthesis and Electrochemical Properties of Pr1-xSrCo0.5Ni0.5O4+δ Cathode Materials[J].Chinese Journal of Inorganic Chemistry,2019,35(2):245-253.
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Chinese Journal of Inorganic Chemistry