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. 2023 Dec 5;120(50):e2312224120. doi: 10.1073/pnas.2312224120

Fig. 5.

Fig. 5.

Reconstruction terminating mechanism with Al3+ leaching. (A) Normalized ex-situ Co K-edge XANES analysis of LSCAO-0.2 under 1.175, 1.375, 1.475, 1.575, and 1.625 V (vs. RHE), as well as the FT k4χ(R) Co K-edge EXAFS. (B) Calculated Co−O and Co−Co EXAFS distance of LSCAO-0.2 under different potentials. (C) ICP-MS test of the electrolyte for LSCAO-0.2 under an operation time of 0 to 10 min (in 1 M KOH under 20 μA cmox−2). The dissolubility of Al in terms of Al(OH)4− is far beyond the concentration of Al3+ in our tested electrolytes. (D) Computational model for LSCAO-0.22 after Al3+ leaching and schematic band diagrams of LSCAO-0.22 with and without Al3+ vacancies. The perovskite structure beneath the reconstructed surface was confirmed by the atomic-resolution HAADF-STEM image (SI Appendix, Fig. S32).