Metal Doped Core–Shell Metal‐Organic Frameworks@Covalent Organic Frameworks (MOFs@COFs) Hybrids as a Novel Photocatalytic Platform

Abstract

Metal doped core–shell Metal‐Organic Frameworks@Covalent Organic Frameworks (MOFs@COFs) are presented as a novel platform for photocatalysis. A palladium (Pd) doped MOFs@COFs in the form of Pd/TiATA@LZU1 shows excellent photocatalytic performance for tandem dehydrogenation and hydrogenation reactions in a continuous‐flow microreactor and a batch system, indicating the great potential of the metal doped MOFs@COFs as a multifunctional platform for photocatalysis. Explanations for the performance enhancement are elucidated. An integrated dual‐chamber microreactor coupled with the metal doped MOFs@COFs is introduced to demonstrate a concept of an intensified green photochemical process, which can be broadly extended to challenging liquid–gas tandem and cascade reactions.

Opportunities of Covalent Organic Frameworks for Advanced Applications

“…[56] A combination of spectroscopy and control experiments revealed that a synergy exists among the three components with the metal elucidated to be the active center, the MOF core as an electron donor, and the COF shell as a mediator for electron transfer. [56] A combination of spectroscopy and control experiments revealed that a synergy exists among the three components with the metal elucidated to be the active center, the MOF core as an electron donor, and the COF shell as a mediator for electron transfer.…”

Room‐Temperature Synthesis of Covalent Organic Framework (COF‐LZU1) Nanobars in CO2/Water Solvent

“…[3,24,25] In this study,C OF-LZU1 was prepared by the co-condensation of 1,3,5-triformylbenzene (TFB) and p-phenylenediamine (PPDA) in CO 2 /water solvent. [3,24,25] In this study,C OF-LZU1 was prepared by the co-condensation of 1,3,5-triformylbenzene (TFB) and p-phenylenediamine (PPDA) in CO 2 /water solvent.…”

“…For COF-LZU1 synthesized at 4.5 MPa, uniform nanobars were obtained with aw idth of 80 nm (Figure 1b-d). [24,25] The possible reason for the formation of small COF-LZU1n anoparticles in CO 2 /water solventwill be discussed below. This indicatest hat high-pressure CO 2 favors the formation of COF-LZU1 nanoparticles.…”

“…Small Pd nanoparticles are highly dispersed on the surfaceo ft he COF-LZU1 nanobars (Figure 3a,b). [25] The Pd content in the Pd/COF-LZU1 composite was determined to be 2.32 wt %b yi nductivelyc oupled plasma (ICP) atomic emission spectroscopy.T he chemical states of Pd were investigated by X-ray photoelectron spectroscopy( XPS), which showedt hat Pd on the surfaceo fC OF is in two chemical states (Pd 0 and Pd 2 + ; Figure S6). The nanoparticle size is distributed in an arrow range of 1.2-3.2 nm, with an average size of 2.0 nm (Figure 3d).…”

“…COF-LZU1, an imine-linkedC OF material, is highly stable in water and most organic solvents and has been regarded as a promising catalysts upport. [3,24,25] In this study,C OF-LZU1 was prepared by the co-condensation of 1,3,5-triformylbenzene (TFB) and p-phenylenediamine (PPDA) in CO 2 /water solvent. The reactiont ime was 24 h. Figure 1a shows the X-ray diffraction (XRD) patterns of the products synthesized at different pressures.…”