Fig. 2

Morphology and structure. a Simplified geometrical structure of PB and ZnPB with various doping levels. TEM images of b PB, c ZnPB-1, d ZnPB-2 and e ZnPB-3. f Elemental mapping images of ZnPB-3. g XRD patterns of PB, ZnPB-1, ZnPB-2 and ZnPB-3 (Stellate signs present the peaks of zinc hexacyanoferrate). h UV–Vis–NIR spectra of PB, ZnPB-1, ZnPB-2 and ZnPB-3. Source data are provided as a Source Data file