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The Influence of Particle Size and Shape in Cobalt 2‐Methylimidazolate Polymers on Catalytic Properties
Author(s) -
DíazDuran Ana Katherine,
Roncaroli Federico
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202100255
Subject(s) - chemistry , cobalt , dodecahedron , pyrolysis , particle size , nanoparticle , catalysis , imidazolate , amorphous solid , zeolitic imidazolate framework , particle (ecology) , dispersion (optics) , chemical engineering , stoichiometry , polymer , carbon fibers , polymer chemistry , inorganic chemistry , crystallography , metal organic framework , organic chemistry , materials science , composite material , engineering , oceanography , physics , adsorption , optics , composite number , geology
Abstract The reaction products between in situ generated Co(OH) 2 and 2‐methylimidazole were studied and characterized. Using 9 fold excess of ligand, the well studied polyhedral (dodecahedral) particles (1–3 μm diameter) of the zeolitic imidazolate framework were obtained, i. e. ZIF‐67. When a stoichiometric amount of 2‐methylimidazole was employed, amorphous spheres of ca 500 nm diameter were obtained with low dispersion in size. Both samples were pyrolyzed at 700 and 900 °C under inert atmosphere. The external morphology was kept, however TEM images of the spherical particles showed that they were mainly composed of carbon nanotubes. Co nanoparticles embedded in the carbonaceous matrix could be observed in both samples. The activity of the pyrolyzed (700 and 900 °C) acid leached samples towards the Oxygen Reduction Reaction was studied. Upon the same thermal treatment both types of samples showed similar electrokinetic parameters.