Design and Remarkable Efficiency of the Robust Sandwich Cluster Composite Nanocatalysts ZIF-8@Au₂₅@ZIF-67

Abstract

Heterogeneous catalysts with precise surface and interface structures are of great interest to decipher the structure–property relationships and maintain remarkable stability while achieving high activity. Here, we report the design and fabrication of the new sandwich composites ZIF-8@Au25@ZIF-67­[tkn] and ZIF-8@Au25@ZIF-8­[tkn] [tkn = thickness of shell] by coordination-assisted self-assembly with well-defined structures and interfaces. The composites ZIF-8@Au25@ZIF-67 efficiently catalyzed both 4-nitrophenol reduction and terminal alkyne carboxylation with CO2 under ambient conditions with remarkably improved activity and stability, compared to the simple components Au25/ZIF-8 and Au25@ZIF-8, highlighting the highly useful function of the ultrathin shell. In addition, the performances of these composite sandwich catalysts are conveniently regulated by the shell thickness. This concept and achievements should open a new avenue to the targeted design of well-defined nanocatalysts with enhanced activities and stabilities for challenging reactions.

Activity and Stability Boosting of an Oxygen‐Vacancy‐Rich BiVO4 Photoanode by NiFe‐MOFs Thin Layer for Water Oxidation

“…It is known that catechol groups coordinate spontaneously and strongly with metal atoms [16] . In view that PVP is oxidizable, and more importantly the blurred interface caused by the presence of PVP impedes the clarification of the structure–activity relationships, [16c] we used caffeic acid (CA), which is with catechol group in the present study for the construction of core–shell Ov‐BiVO 4 @NiFe‐MOFs (Scheme 1). On the other hand, CA shares the same terminal group (carboxylate group) as the MOF linker, allowing for the chelation of the metal ions and the subsequent growth of the MOF layer.…”

Recent advances in catalytic conversion of carbon dioxide to propiolic acids over coinage-metal-based catalysts

“…Very recently, Sheng and her colleagues developed a sandwich Au cluster catalyst ZIF-8@Au 25 @ZIF-67 by a design with accurate surface and interface structures (Fig. 12) [112]. Specifically, ZIF-8@Au 25 @ZIF-67 was fabricated through coordination assisted self-assembly strategy with three-step process.…”

Engineering of Yolk/Core–Shell Structured Nanoreactors for Thermal Hydrogenations

“…The conventional single‐shell structure derived from MOFs can be designed to become a sandwich or a multishell hollow structure. [ 119 ] One example is Pt‐CeO 2 @UiO‐66‐NH 2 that was prepared with the assistance of polystyrenesulfonate to alter the surface charge and microwave to adjust the nucleation process ( Figure a). This single‐shell MOF derived Pt‐CeO 2 @UiO‐66‐NH 2 can convert 99.3% of furfural almost entirely to (>99%) furfuryl alcohol.…”