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(a) An illustrative schematic depicts the heterostructured GPE. (b–d) SEM images and optical images of the prepared films. (b) GPE film, (c) GPE-ZIF8 film, and (d) GPE-ZIF8-Al2O3 film. (e) SEM image showcases a cross-section of the GPE-ZIF8-Al2O3 film. (f,g) The EDS elemental distribution maps are depicted. Reproduced with permission from [66].
