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a, b Schematic representation of the etching process for HKUST-1 using phosphoric acid, showing phosphoric acid diffusing into HKUST-1 to form a hierarchical porous structure (a) and the disassembly of a cluster and 4 linkers (b). c–e SEM images of HKUST-1 etching in phosphoric acid using DMSO and MeOH as dilute solvents at pH 2.8 (c) and pH 2.6 (d, e), showing interconnected geometrical macropores after etching.
Reprinted with permission from Ref. [96]
