Enhancement of the electrochemical properties for La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen electrode by the addition of CaxCo4O9+δ nano-catalysts

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL Ionics Pub Date : 2024-09-28 DOI:10.1007/s11581-024-05848-z

Lei Wang, Yanting Tian, Zhanfeng Li, Jiping Zhu, Tianlong Bian

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Abstract

La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) perovskite with good stability and high oxygen diffusion coefficient has been extensively studied as oxygen electrode in reversible solid oxide cells (RSOCs). Significant promotion of oxygen reaction kinetics of the LSCF oxygen electrode was achieved by the addition of Ca_xCo₄O_9+δ (CCOx, x = 3, 1.5) nano-catalysts in the present study. The La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ-Ca_1.5Co₄O_9+δ (LSCF-CCO1.5) electrode exhibited the optimal electrochemical property among the LSCF-based electrodes and the lowest polarization resistance (R_p) of 0.039 Ω·cm² was attained at 800 °C, which was ~ 97% lower than that of the LSFM electrode. Furthermore, the LSCF-CCO1.5 oxygen electrode also manifested excellent thermal cycling stability and alternating polarization durability. The hydrogen production rate of the LSCF-CCO1.5 electrolytic cell was 946 mL·cm⁻²·h⁻¹ at 1.5 V at 800 °C, which was 2.6 times higher than that of the LSCF cell (362 mL·cm⁻²·h⁻¹). The results certified the enhancement of electrochemical properties for LSCF oxygen electrode by the addition of CCOx nano-catalysts.

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.