Enhancement of the electrochemical properties for La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen electrode by the addition of CaxCo4O9+δ nano-catalysts
La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 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 x Co 4 O 9+δ (CCOx, x = 3, 1.5) nano-catalysts in the present study. The La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ -Ca 1.5 Co 4 O 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·cm 2 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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