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One‐Step Synthesis of Core‐Shell‐Structured Mixed‐Metal CPO‐27(Cu,Co) and Investigations on Its Controlled Thermal Transformation
Author(s) -
Bitzer Johannes,
Göbel Christoph,
Muhamad Ismail Ayas,
Fu Qi,
Muhler Martin,
Kleist Wolfgang
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.202100227
Subject(s) - bimetallic strip , chemistry , thermal decomposition , copper , cobalt , crystallite , amorphous solid , metal , chemical engineering , dispersion (optics) , inorganic chemistry , analytical chemistry (journal) , crystallography , organic chemistry , physics , engineering , optics
Using the mixed‐metal approach, a direct synthesis route at ambient pressure was developed for a new type of bimetallic metal‐organic framework based on the CPO‐27 structure. The structural characterization of CPO‐27(Cu 0.6 −CS−Co 0.4 ) using X‐ray diffraction, transmission electron microscopy, energy‐dispersive X‐ray mapping and X‐ray absorption spectroscopy revealed that the Cu 2+ and Co 2+ ions were exclusively incorporated at the metal positions of the CPO‐27 lattice, but with a core‐shell distribution within the crystallites. The parent framework material was then utilized as a precursor for the generation of novel bimetallic carbon‐supported materials using the controlled thermal decomposition in a reducing atmosphere. During this decomposition process, the distribution of the two metals remained the same, which resulted in unique needle‐shaped particles with a high dispersion of cobalt at the periphery of the amorphous carbon and agglomerated copper particles in the inside.