P‐Incorporation Induced Enhancement of Lattice Oxygen Participation in Double Perovskite Oxides to Boost Water Oxidation

Abstract

Activating the lattice oxygen in the catalysts to participate in the oxygen evolution reaction (OER), which can break the scaling relation–induced overpotential limitation (> 0.37 V) of the adsorbate evolution mechanism, has emerged as a new and highly effective guide to accelerate the OER. However, how to increase the lattice oxygen participation of catalysts during OER remains a major challenge. Herein, P‐incorporation induced enhancement of lattice oxygen participation in double perovskite LaNi0.58Fe0.38P0.07O3‐σ (PLNFO) is studied. P‐incorporation is found to be crucial for enhancing the OER activity. The current density reaches 1.35 mA cmECSA−2 at 1.63 V (vs RHE), achieving a sixfold increase in intrinsic activity. Experimental evidences confirm the dominant lattice oxygen participation mechanism (LOM) for OER pathway on PLNFO. Further electronic structures reveal that P‐incorporation shifts the O p‐band center by 0.7 eV toward the Fermi level, making the states near the Fermi level more O p character, thus facilitating LOM and fast OER kinetics. This work offers a possible method to develop high‐performance double perovskite OER catalysts for electrochemical water splitting.

Tuning the high-entropy perovskite as efficient and reliable electrocatalysts for oxygen evolution reaction

“…The rapid decrease in the potential is closely related to the catalyst surface reconstruction due to the strong oxidizing conditions during the OER process. 6,32,33 Immediately thereaer, the OER was run at 20 mA cm −2 for 10 h and then returned to 10 mA cm −2 for 10 h. The nal stabilization potential @10 mA cm −2 for La(5B 0.2 )O 3 was 1.64 V vs. RHE. However, the same stability test procedure was performed on the 0.7Sr catalyst.…”