Atomic Co–N₄ and Co nanoparticles confined in COF@ZIF-67 derived core–shell carbon frameworks: bifunctional non-precious metal catalysts toward the ORR and HER

Abstract

Constructing heterostructures of covalent organic frameworks (COFs) and metal organic frameworks (MOFs) have gained great attention for various applications due to their well-defined skeletons, ordered porosity and designable functions. Herein,...

Core–Shell Carbon‐Based Bifunctional Electrocatalysts Derived from COF@MOF Hybrid for Advanced Rechargeable Zn–Air Batteries

“…[27] Recently, Zeng et al developed a bifunctional metal/ carbon-based electrocatalyst derived from COF@MOF hybrid toward ORR and HER. [28] Inspired by their unique structure and complementary advantages of COFs and MOFs, the hybridization of COFs and MOFs is promising and effective to yield ideal bifunctional electrocatalysts with both ORR and OER activity. It should be noted that the catalytic activity of the carbon-based electrocatalysts for OER and ORR largely depends on their compositions and structures.…”

Rare-Earth-Based Bimetallic Metal–Organic Frameworks Promote Oxygen Electrocatalysis for Rechargeable Zn–Air Batteries

“…In the recent several years, most of the research studies have been devoted to the use of nonprecious metal carbon-based materials to replace noble metal catalysts. − Among them, the metal–organic framework (MOF) has been demonstrated to be an ideal symbolic sacrificial template for the purpose of preparing various carbon-based materials. − MOF is prepared by connecting metal ions with organic ligands. Some studies introduced MOF based on transition metals to electrocatalysis, for example, Zn-MOF, Ni-MOF, Fe-MOF, and Co-MOF .…”

Design and Synthesis of Four Newly Water-Stable Pb-Based Heterometallic Organic Frameworks: How Do the Second Metals (Zn, Cd, Co, and Mn) Optimize Their Fluorescent and Catalytic Properties?

“…Recently, there have been a lot of research studies exploring the synthesis and performance of MOFs because of their tunable structures and divisible features. − Typically, most MOFs exhibit a single function and relatively poor water stability, rendering them hardly conducive to practical application. For many years, numerous attempts have been made to overcome various challenges, especially modifying MOFs by postsynthesis and compositing MOFs with other materials. − Good results have been obtained by introducing the specific metal ions into one skeleton to form a heterometallic organic framework (HMOF), which was utilized because of its convenience and efficiency. − HMOFs are complexes that coordinate two or more metals with organic ligands and can be simply obtained by one-pot reactions referring to the hard and soft acids and bases (HSAB) theory . Factually, the introduction of other metals can optimize the inherent properties of monometallic MOFs by adjusting the pore and electronic structures. − For example, the d–d doping HMOFs have shown significant potential in electrocatalyst − and energy-storage electrode materials. − In addition, the d–f (transition metals and lanthanide ions) or f–f (various lanthanide metals) HMOFs have made great breakthroughs in fluorescence sensing. − However, owing to the inherent properties of metals (radius and chemical hardness/softness), it is always easier to form monometallic MOFs or a mixed phase rather than HMOFs in a conventional one-pot reaction .…”