Fig. 2.

Morphology and XAFS results of the NiMnCo-AC catalyst. (A) The digital image of the NiMnCo-AC catalyst powders. (B) High-angle annular dark field image of the NiMnCo-AC catalyst. (C) Particle-size distribution of the NiMnCo nanoparticles in the NiMnCo-AC catalyst. (D–F) X-ray absorption near-edge spectroscopy curves of the NiMnCo-AC catalyst. (G–I) k²-weighted R-space EXAFS curves of the NiMnCo-AC catalyst. (J–L) WT of Ni foil, Mn foil, Co foil, NiO, MnO, CoO, and NiMnCo-AC catalyst (Ni, Mn, and Co).