Further improvement in performances of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ) - doped ceria composite oxygen electrodes with infiltrated doped ceria nanoparticles for reversible solid oxide cells

摘要

We have developed high-performance oxygen electrodes for reversible solid oxide cells. La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) center dot (CeO2)(0.8)(SmO1.5)(0.2) (SDC) composite scaffolds were infiltrated with SDC nanoparticles. The electrode with 30 vol% load of SDC nanoparticles exhibited very low overpotentials, eta = 0.010 V for anodic and vertical bar eta vertical bar = 0.030 V for cathodic reactions at 0.7 A cm(-2) and 800 degrees C, which was ascribed to a noticeable increase in the exchange current densities. The electrodes have shown very stable performance under anodic oxygen evolution operation at -0.5 A cm(-2) and 750 degrees C for 400 h. Such electrodes developed are extremely promising oxygen electrodes for R-SOC ever reported.