Fig. 1. Morphological and structural characterization of the catalyst. (a) SEM image of the ZnO crystals with a dorayaki-like morphology. (b) TEM image and (c) HAADF-STEM image of a Pd particle deposited on the oxygen-rich (000 1̄ ) surface of ZnO. (d) High-magnification image of the lower part in (c). (e) The corresponding FFT pattern of (c). (f) Scheme of wurtzite ZnO with the (000 1̄ ) oxygen-rich surface. (g) Model of the PdO/ZnO atomic structure. (h) The atomic arrangement at different ZnO facets. Pd (yellow), Zn (blue), and O (red).
