Abstract
ZIF-8 is a crystalline microporous material that has been widely studied because of its thermal and chemical stability relative to other metal–organic frameworks (MOFs) and its potential for use in a number of gas adsorption, separation, and catalysis applications. However, most studies focus on characterization of the bulk structure of ZIF-8, ignoring the potential effect of the particle shape and the external surface on these applications. This report describes studies that examined the stability of the {110} and {100} crystallographic facets of ZIF-8 under mildly acidic conditions. Though the {110} facet is more thermodynamically stable than the {100} facet, it is found to be more susceptible to degradation by acid exposure. It is hypothesized that the mechanism of particle degradation follows a shrinking-core model, with surface imidazolates being replaced by hydroxyls, as suggested by complementary X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy characterization. Computat...
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