Strain Modified Oxygen Evolution Reaction Performance in Epitaxial, Freestanding, and Van Der Waals Manganite Thin Films

Abstract

In perovskite complex oxides, the strain has been established as a promising approach for tuning the oxygen evolution reaction (OER) performance by the manipulated electronic structure and interaction/coupling. In this study, we have employed rigid epitaxial, flexible freestanding, and van der Waals La2/3Sr1/3MnO3 (LSMO) to investigate the strain effects on OER, which are different in stress strength and range via lattice mismatch and curvature change. It was found that the OER performances as a function of strain exhibited volcano and monotonous trends in rigid and flexible LSMO, respectively. The findings suggest that distinguished oxygen activation energy in varied lattice fields also plays a crucial role in the epitaxial LSMO in contrast to the pure strain effect in the flexible LSMO. Our results not only fundamentally clarify the effort of strain but also technologically provide an effective route to engineer the electronic structure for modified OER performance by perovskite complex oxides.

Lattice‐Strain Engineering for Heterogenous Electrocatalytic Oxygen Evolution Reaction

“…In another context, Lü and co‐workers jointly reported the elastic strain of a rigid epitaxial and flexible freestanding perovskite oxide, [ 266 ] and analyzed the unusual structure‐activity relationship between strain type and catalytic performance. La 2/3 Sr 1/3 MnO 3 (LMSO) as an epitaxially grown material results in biaxial strain due to the difference between the intrinsic lattice constants and substrate.…”

“…g,h) LSV profiles of F-LSMO and V-LSMO films at different mechanical strains. c-h) Reproduced with permission [266]. Copyright 2022, American Chemical Society.…”

The modulated oxygen evolution reaction performance of LaFeO3 with abundant electronic structures via a design of stoichiometry offset

“…The capacitance at 20 mTorr is 8.2 mF, and the capacitance values under other oxygen pressures are shown in Table S4 (ESI †). [49][50][51][52][53][54][55] In order to show the complete OER performance of LFO, the stability of the sample was tested by chronoamperometry as shown in Fig. S5 (ESI †).…”

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

“…The theoretical overpotential can be obtained by the formula: The result revealed the general volcano relationship between the overpotential and ΔG O* – ΔG OH* independent of the catalyst material. In view of the theoretical guidance of the above catalyst activity descriptors, in recent years, researchers have used some strategies including doping engineering, defect engineering, and the stress effect to optimize the ΔG O* – ΔG OH* value, so as to enhance the OER catalytic performance of perovskites. − …”