Synergistic Effects of Co and Fe on the Oxygen Evolution Reaction Activity of LaCo_x Fe_1-x O₃.

ABSTRACT: In a combined experimental and theoretical study we assess the role of Co incorporation on the OER activity of LaCo_x Fe_1-x O₃ . Phase pure perovskites were synthesized up to x=0.300 in 0.025/0.050 steps. HAADF STEM and EDX analysis points towards FeO₂ -terminated (001)-facets in LaFeO₃ , in accordance with the stability diagram obtained from density functional theory calculations with a Hubbard U term (DFT+U). Linear sweep voltammetry conducted in a rotating disk electrode setup shows a reduction of the OER overpotential and a nonmonotonic trend with x, with double layer capacitance measurements indicating an intrinsic nature of activity. This is supported by DFT+U results that show reduced overpotentials for both Fe and Co reaction si

SUBMITTER: Fungerlings A 

PROVIDER: S-EPMC9298257 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature