Figure 2.

Morphological and crystallographic characterization

FE-SEM micrographs of as-prepared catalysts: (A) sparse MnO₂/MXene (scale bar, 250 nm), (B) dense MnO₂/MXene (scale bar, 250 nm), and (C) MnO₂ urchin/MXene (scale bar, 250 nm).

(D–F) HRTEM images (scale bar = 10 nm), (E and F) corresponding lattice space (scale bar, 2 nm), (G) The SAED pattern (scale bar, 5 nm⁻¹), and (H) EDS mapping (scale bar , 1 μm) of dense MnO₂/MXene.