Citation: LIU Jian-Wei, SUN Li-Ping, ZHAO Hui, HUO Li-Hua. Synthesis and Electrochemical Properties of Pr_1-xSrCo_0.5Ni_0.5O_4+δ Cathode Materials[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(2): 245-253. doi: 10.11862/CJIC.2019.030 shu

Synthesis and Electrochemical Properties of Pr_1-xSrCo_0.5Ni_0.5O_4+δ Cathode Materials

Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China

Corresponding author: SUN Li-Ping, lipingsun98@yahoo.com
Received Date: 22 August 2018
Revised Date: 3 December 2018

Figures(10)

Intermediate temperature solid oxide fuel cells (IT-SOFCs) cathode materials Pr_1-xSrCo_0.5Ni_0.5O_4+δ (P_1-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 Ce_0.9Gd_0.1O_1.95 (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 P_0.90SCN 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 P_0.90SCN cathode at 700℃ in air. The maximum output power density of electrolyte supported single cell NiO-CGO/CGO/P_0.90SCN was 197.8 mW·cm^-2 at 700℃.
- intermediate temperature solid oxide fuel cells,
- cathode materials,
- oxygen reduction reaction,
- Pr_1-xSrCo_0.5Ni_0.5O_4+δ
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Synthesis and Electrochemical Properties of Pr1-xSrCo0.5Ni0.5O4+δ Cathode Materials

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Synthesis and Electrochemical Properties of Pr_1-xSrCo_0.5Ni_0.5O_4+δ Cathode Materials