Enhanced oxygen reduction reaction activity of Ca doping CoFe2O4 as cathodes for solid oxide fuel cells

IF 3.3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2025-04-01 Epub Date: 2025-02-26 DOI:10.1016/j.ssi.2025.116812

Fangjie Liu, Zhengqi Su, Haizhao Li, Qingjie Wang, Xin Wang, Weiwei Shang, Bin Xu

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Abstract

CoFe₂O₄ (CFO) was identified as one of the potential cathode materials for solid oxide fuel cells (SOFCs). However, optimization was required due to limitations of electrochemical performance. Here effects of Ca doping on CFO were investigated for the oxygen reduction reaction (ORR) properties. Co_1-xCa_xFe₂O₄ (CCxFO, x = 0, 0.2 (CC2FO), 0.4 (CC4FO)) were synthesized with sol-gel method. Oxygen vacancy concentration was increased by Ca doping enhancing the electrochemical performance of CFO. At 750 °C, the polarization resistance (R_p) of CC4FO was 1.04 Ω·cm², which was 1.09 Ω·cm² lower than that of CFO (2.13 Ω·cm²). The electronic conductivity value (σ) of CC4FO was 0.614 at 750 °C and the activation energy (E_a) of CC4FO was 102.81 kJ/mol. The results indicated that improvements in the ORR activity of the CFO spinel material were mainly attributed to an increase in oxygen vacancy concentration and oxygen surface exchange rate due to Ca doping, CC4FO showed promising potential as SOFC cathode.

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钙掺杂CoFe2O4作为固体氧化物燃料电池阴极提高氧还原反应活性

CoFe2O4 （CFO）是固体氧化物燃料电池（SOFCs）极具潜力的正极材料之一。然而，由于电化学性能的限制，需要对其进行优化。本文研究了Ca掺杂对CFO氧还原反应（ORR）性能的影响。采用溶胶-凝胶法制备了Co1-xCaxFe2O4 (CCxFO, x = 0,0.2 （CC2FO), 0.4 (CC4FO)）。Ca的掺入提高了氧空位浓度，提高了CFO的电化学性能。750℃时，CC4FO的极化电阻（Rp）为1.04 Ω·cm2，比CFO的（2.13 Ω·cm2）低1.09 Ω·cm2。750℃时，CC4FO的电导率（σ）为0.614，活化能（Ea）为102.81 kJ/mol。结果表明，CFO尖晶石材料ORR活性的提高主要是由于Ca掺杂提高了氧空位浓度和氧表面交换率，CC4FO作为SOFC阴极具有广阔的应用前景。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.