Molecular scissor tailoring hierarchical architecture of ZIF-derived Fe/N/C catalysts for acidic oxygen reduction reaction

Engineering the Structure of ZIF-Derived Hierarchically Porous CoZn Catalysts for Efficient Selective Hydrogenation of Nitroarenes

“…Despite much progress made in ZIF-derived metal/porous carbon catalysts, some drawbacks still exist and need to be solved. First, the ZIFs only derived metal/porous carbon catalysts generally exhibit the microporous structure rooted in pristine ZIFs, which is detrimental to the mass transfer of molecules. − In addition, the three-dimensional structure of metal/porous carbon catalysts can be inherited from the morphology of pristine ZIFs. Together with the microporous structure, both hinder the accessibility of the active site, causing a low catalytic performance.…”

Polypyrrole Template-Assisted Synthesis of Tubular Fe-NC Nanostructure-Based Electrocatalysts for Efficient Oxygen Reduction Reaction in Rechargeable Zinc–Air Battery

“…Notably, zeolite imidazole frameworks (ZIFs) involving imidazole ligands and metal centers (Zn, Co, etc.) have been intentionally utilized as precursors/templates to construct the carbon-supported metal nanoparticles (NPs) or single atoms due to their merits such as high porosity, robust framework, and plentiful N-rich ligands. − Scientists have devoted considerable efforts to the syntheses and performances of ZIFs and their derivatives. − Based on the above considerations, it is expected that the calcination treatment of Fe-doped Zn-ZIF is able to not only achieve a high density of Fe-based active sites but also generate abundant hierarchical pores and structural defects induced by zinc evaporation in the process of pyrolysis, which facilitate significant enhancement of the ORR activity . Unfortunately, direct pyrolysis for ZIFs usually undergoes an inevitable self-aggregation, and severe morphological contraction and structural collapse, which is not conductive to boosting the catalytic performance .…”

In situ Formation of Intermetallic PtZn Alloy Nanoparticles Embedded in Mesoporous Carbon Boosting the Oxygen Reduction Reaction

“…25−27 For example, by utilizing carboxylate doping in ZIF-8 nanocages at an atomic scale and high-temperature pyrolysis, Wang et al synthesized an Fe/N/C electrocatalyst that exhibited a significantly high half-wave potential (E 1/2 ) of 0.838 V in 0.1 M HClO 4 . 25 Despite the high half-wave potential, the poor long-term stability of the Fe/N/C electrocatalyst during the operation of proton exchange membrane fuel cells (PEMFCs) presents a significant drawback, posing a significant challenge to the development of Ptfree catalysts. One important point should be noted, such a carbon-based active Co−N−C catalyst may be useful for dispersing Pt or Pt-based alloy nanoparticles by offering more active sites to anchor Pt ions and subsequently boost the cathode ORR kinetic process.…”