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Updated: Feb 12, 2026

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Published on: September 20, 2012

La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ酸素電極におけるSr偏析のCaドーピングによる抑制と可逆固体酸化物形電池の性能安定性向上

Jianzhi Yu¹, Xucong Liu¹, Mengjin Zhong¹

¹School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

ACS applied materials & interfaces

|February 11, 2026

Abstract:

A reversible solid oxide cell (RSOC) can generate electricity and hydrogen, respectively, when operating in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes. However, at high current densities, serious Sr segregation in the traditional La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ-Gd_0.1Ce_0.9O_2-δ (LSCF-GDC) oxygen electrode leads to a decrease in the catalytic activity of the cathode and consequently poor performance stability of RSOC. In this work, Ca doping was proposed to suppress Sr segregation in the LSCF-based composite electrodes. The smaller radius of the Ca atom could reduce the elastic driving force of Sr segregation, while the reasonable Ca-doping concentration could alleviate the steep oxygen vacancy gradient formed under high current density and thereby reduce the electrostatic driving force of Sr segregation. Consequently, after appropriate Ca substitution at the A-site, the prepared La_0.6Sr_0.2Ca_0.2Co_0.2Fe_0.8O_3-δ-Gd_0.1Ce_0.9O_2-δ(LSCCF-GDC) oxygen electrode reported significantly enhanced stability during long-term operation at high current density. At 750 °C and a current density of 1.2 A·cm^-2, the degradation rates of the cell with LSCCF-based composite oxygen electrode were 10 mV/100 h in SOFC mode and 17 mV/100 h in SOEC mode, which was much lower compared with the corresponding values of the cell with the traditional LSCF-based composite oxygen electrode (18 mV/100 h in SOFC mode and 82 mV/100 h in SOEC mode).

キーワード:

Caドーピング Sr偏析酸素電極性能安定性可逆固体酸化物形電池

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