Advanced High Entropy Perovskite Oxide Electrocatalyst for Oxygen Evolution Reaction. (5th May 2021) - Nguyen, Thi Xuyen
Abstract: 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(CrMnFeCo2 Ni)O3 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. Abstract : Lanthanum‐based high entropy perovskite oxides (HEPOs) with a B‐site consisting of five consecutive first‐row transition metals are synthesized in both equimolar and non‐equimolar ratios. The HEPO electrocatalysts outperform the single perovskite oxides. The optimized La(CrMnFeCo2 Ni)O3 HEPO exhibits an outstanding OER overpotential of 325 mV at 10 mA cm –2 and excellent stability after 50 h of testing.