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Controlled Synthesis of a Hexagonal‐Shaped NiO Nanocatalyst with Highly Reactive Facets {1 1 0} and Its Catalytic Activity
Author(s) -
Patra Astam K.,
Kundu Sudipta K.,
Kim Dukjoon,
Bhaumik Asim
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402871
Subject(s) - non blocking i/o , materials science , nanocrystal , crystallinity , catalysis , chemical engineering , annealing (glass) , nanoparticle , nanotechnology , high resolution transmission electron microscopy , hexagonal phase , transmission electron microscopy , crystallography , hexagonal crystal system , chemistry , metallurgy , organic chemistry , composite material , engineering
A new facile chemical approach has been developed to produce hexagonal‐shaped NiO nanocrystals with high‐energy facets {1 1 0} under hydrothermal synthesis followed by annealing in the presence of air. The phase purity, crystallinity, shape/size, and mesostructure of NiO nanocrystals were investigated by powder XRD and high‐resolution transmission electron microscopy. The size, shape, and exposed crystal facets of the nanocrystals are the key factor for their physical and chemical properties. Herein, the chemical properties of hexagonal‐shaped NiO nanocrystals have been tested for the reduction of carbonyl compounds in comparison with NiO nanoparticles and bulk NiO materials. The reactivity of the NiO nanocrystals is enhanced dramatically through morphology evolution. In particular, hexagonal‐shaped NiO nanocrystals with highly reactive {1 1 0} facets exhibit approximately 12 and 25 % higher catalytic activity than NiO nanoparticles and bulk NiO, respectively. These hexagonal‐shaped NiO nanocrystals are active over several cycles for the reduction of carbonyl compounds to their respective alcohol in the presence of 2‐propanol.