Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 - XCoO3 - δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes

Youmin Guo, Dengjie Chen, Huangang Shi, Ran Ran, Zongping Shao

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

SmxSr1 - xCoO3 - δ (SSCx) materials are promising cathodes for IT-SOFCs. The influence of Sm content in SSCx (0.2 ≤ x ≤ 0.8) oxides on their oxygen nonstoichiometry, oxygen desorption, thermal expansion behavior, electrical conductivity and electrochemical activity for oxygen reduction is systematically studied by iodometric titration, oxygen-temperature programmed desorption (O2-TPD), dilatometer, four-probe DC conductivity, electrochemical impedance spectroscopy (EIS) and three-electrode polarization test, respectively. Iodometric titration experiments demonstrate that the electrical charge neutrality compensation in SSCx proceeds preferably through the oxidation of cobalt ion for high Sm 3+ contents (x ≥ 0.6). However, it proceeds mainly through the creation of oxygen vacancies at x ≤ 0.5. O2-TPD shows SSC5 possesses the highest oxygen desorption ability among the range of SSCx materials tested. The thermal expansion coefficients (TECs) are high between the transition temperature and 900 °C, showing values typically larger than 20 × 10-6 K-1. All dense materials show high electrical conductivity with a maximum value of ∼1885 S cm-1 for SSC6 in air, while SSC5 has the highest electrical conductivity in nitrogen. EIS analysis of porous electrodes demonstrates that SSC5 has the lowest area specific resistance (ASR) value (0.42 Ω cm2) at 600 °C. Cathodic overpotential testing demonstrates that SSC5 also has the largest exchange current density of 60 mA cm-2 at 600 °C in air.

Original languageEnglish
Pages (from-to)2870-2876
Number of pages7
JournalElectrochimica Acta
Volume56
Issue number7
DOIs
StatePublished - 28 Feb 2011

Keywords

  • Electrical conductivity
  • Electrode performance
  • Oxygen vacancy concentration
  • Samarium strontium cobaltite
  • Thermal expansion

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