Cu-doped Nd<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>1−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>3−<i>δ</i></sub> (<i>x</i> = 0, 0.05, 0.1, 0.15, 0.2) as the cathode for intermediate-temperature solid oxide fuel cells
RSC advances