A perovskite oxide with a tunable pore-size derived from a general salt-template strategy as a highly efficient electrocatalyst for the oxygen evolution reaction.

The fabrication of a perovskite oxide with a tunable pore-size was implemented by a general inorganic salt-template strategy. As a proof-of-concept, hierarchically porous PrBa0.5Sr0.5Co1.5-Fe0.5O5+δ (PBSCF) with a surface area of 148 m2 g-1 was successfully prepared, which exhibited remarkable electrocatalytic performance for the oxygen evolution reaction.