Vertically aligned nanocomposite La 0.8 Sr 0.2 CoO 3 /(La 0.5 Sr 0.5 ) 2 CoO 4 cathodes – electronic structure, surface chemistry and oxygen reduction kinetics

A vertically aligned nanocomposite cathode, made of La 0.8 Sr 0.2 CoO 3 /(La 0.5 Sr 0.5 ) 2 CoO 4 , increases oxygen reduction kinetics by 10-fold and has better surface stability compared to its single phase constituents at 320–400 °C.