Advanced High Entropy Perovskite Oxide Electrocatalyst for Oxygen Evolution Reaction

A new type of lanthanum-based high entropy perovskite oxide (HEPO) electrocatalyst for the oxygen evolution reaction is reported. The B-site lattices in the HEPO consist of five consecutive first-row transition metals, including Cr, Mn, Fe, Co, and Ni. Equimolar and five non-equimolar HEPO electrocatalysts are studied for their OER electrocatalytic performance. In the five non-equimolar HEPOs, the concentration of one of the five transition metals is doubled in individual samples. The performances of all the HEPOs outperform the single perovskite oxides. The optimized La(CrMnFeCo2Ni)O-3 HEPO exhibits an outstanding OER overpotential of 325 mV at a current density of 10 mA cm(-2) and excellent electrochemical stability after 50 h of testing.

Automated summary

A new type of lanthanum-based high entropy perovskite oxide (HEPO) electrocatalyst for the oxygen evolution reaction has been reported. The HEPOs with B-site lattices consisting of five consecutive first-row transition metals exhibit excellent OER electrocatalytic performance, with La(CrMnFeCo2Ni)O-3 HEPO showing outstanding OER overpotential and electrochemical stability.