A high performing perovskite cathode with in situ exsolved Co nanoparticles for H2O and CO2 solid oxide electrolysis cell

La0.5Ba0.5Mn1-xCoxO3-? (x < 0.4) with a perovskite structure is studied as cathode material for solid oxide electrolysis cells. The exsolution of metallic Co from the in reducing atmosphere situ investigated. improves electrical conductivity La0.5Ba0.5MnO3-? atmosphere, and facilitates oxygen exchange reaction on surface. exsolved nanoparticles shows high activity both H2O CO2 electrolysis. At 1.3 V, single cell supported by La0.8Sr0.2Ga0.8Mg0.2O3-? electrolyte layer achieves current densities 0.46 1.01 A cm-2 at 700 800 °C, respectively. density 0.88 cm?2 also obtained same 1.2 V 850 °C Faradaic efficiency exceeding 90 %. exhibits stability co-electrolysis studied.