fig1
Figure 1. (A-C) TEM images of the three-dimensional flower-like hierarchical catalysts with different Co/Zn molar ratios, revealing their fine morphological features. (D) High-angle annular dark-field scanning TEM image and the corresponding elemental maps of C, O, Si, N, Co, and Zn for the catalyst with a Co/Zn molar ratio of 2:1, confirming the spatially homogeneous distribution of each element within the architecture.
