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(A) Schematic diagram of FeMn-NCetch/SAC synthesis. (B) TEM image, (C) HRTEM image, and (D) aberration-corrected HAADF-STEM image of FeMn-NCetch/SAC. High-resolution XPS spectra of (E) C 1s, (F) N 1s, (G) Fe 2p, and (H) Mn 2p in FeMn-NCetch/SAC.
