Preparation of MOF Film/Aerogel Composite Catalysts via Substrate‐Seeding Secondary‐Growth for the Oxygen Evolution Reaction and CO 2 Cycloaddition

MOF/POM hybrids as catalysts for organic transformations

Insertion of molecular metal oxides, e.g. polyoxometalates (POMs), into metal-organic frameworks (MOFs) opens up new research opportunities in various fields, particularly in catalysis. POM/MOF composites have strong acidity, oxygen-rich surface, and redox capacity due to typical characteristics of POMs and the large surface area, highly organized structures, tunable pore size, and shape are due to MOFs. Such hybrid materials have gained a lot of attention due to astonishing structural features, and hence have potential applications in organic catalysis, sorption and separation, proton conduction, magnetism, lithium-ion batteries, supercapacitors, electrochemistry, medicine, bio-fuel, and so on. The exceptional chemical and physical characteristics of POMOFs make them useful as catalysts in simple organic transformations with high capacity and selectivity. Here, the thorough catalytic study starts with a brief introduction related to POMs and MOFs, and is followed by the synthetic strategies and applications of these materials in several catalytic organic transformations. Furthermore, catalytic conversions like oxidation, condensation, esterification, and some other types of catalytic reactions including photocatalytic reactions are discussed in length with their plausible catalytic mechanisms. The disadvantages of the POMOFs and difficulties faced in the field have also been explored briefly from our perspectives.

Synthesis of FeNiCo Ternary Hydroxides through Green Grinding Method with Metal-Organic Frameworks as Precursors for Oxygen Evolution Reaction

Metal-organic framework (MOF)-derived materials have been widely applied to diversified fields until now due to their flexible processibility. Different kinds of suitable materials can be synthesized by varying MOF templates/precursors and synthesis methods. An appropriate method can skillfully fabricate the materials with excellent performance while meeting the environmentally friendly concept. In this work, a green and flexible grinding method was introduced to synthesize MOF-derived FeNiCo trimetallic materials without solvent-assistance, in which Co-ZIF-L was selected as a sacrificial precursor and Fe³⁺ and Ni²⁺ as etchants and dopants. Surprisingly, the as-prepared FeNiCo ternary hydroxides supported on Ni foam (G-FeNi-Co-ZIF-L/NF) showed superior electrocatalytic performance for the oxygen evolution reaction (OER) with a low overpotential of 248 mV at 10 mA cm^-2 . This work provides a prospective approach to synthesize various MOF-derived multi-metallic materials, which also opens the door for syntheses of OER electrocatalysts.