Feigang Zhao

Hybrid metal oxides with multilayered structures exhibit unique physical and chemical properties, particularly important to heterogeneous catalysis. However, regulations of morphology, spatial location, and shell numbers of the hybrid metal oxides still remain a challenge. Herein, binary Co3O4/ZnO nanocages with multilayered structures (up to eight layers) are prepared via chemical transformation from diverse Matryoshka‐type zeolitic imidazolate frameworks (ZIFs) via a straightforward and scalable calcination method. More importantly, the obtained ZIF‐derived metal oxides (ZDMOs) with versatile layer numbers exhibit remarkable catalytic activity for both gas‐phase CO oxidation and CO2 hydrogenation reactions, which are directly related to the sophisticated shell numbers (i.e., Co3O4‐terminated layers or ZnO‐terminated layers). Particularly, in situ reflectance infrared Fourier transform spectroscopy (DRIFTS) results indicate that the promotional effects of the multilayered structure...

Freestanding 2D nanosheets with many unprecedented properties have been used in a myriad of applications. In this work, 2D copper‐bearing metal‐organic frameworks (MOFs; viz., Cu‐BDC) nanosheets are successfully fabricated via a facile and benign methodology through using Cu2O nanocubes (≈60 nm) as a confined metal ion source and 1,4‐benzenedicarboxylic acid (H2BDC) as an organic linker. The Cu2O nanocubes gradually release Cu+ ions which are further oxidized by the dissolved oxygen and serve as nutrients for construction of 2D frameworks. In contrast, the conventional solvothermal synthesis with copper salt exclusively yields bulk Cu‐BDC with edge dimensions of 2–10 µm. Interestingly, the as‐prepared Cu‐BDC nanosheets show ultrathin thickness, oriented growth, and excellent crystallinity, which can be exploited as a platform for the design of a series of 2D‐integrated nanocatalysts by loading various metal nanocrystals such as Au, Ag, Pt, and Ru, with 3‐mercaptopropionic acid as mo...