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Heteroepitaxial Growth of Well‐Dispersed Co 3 O 4 Nanocatalysts on Porous ZnO Nanoplates via Successive Hydrothermal Deposition
Author(s) -
Feng Zhenyu,
Bao Wenya,
Xu Xiaohong,
Ma Xicheng,
Zhan Jinhua,
Yin Yadong
Publication year - 2016
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201600204
Subject(s) - materials science , hydrothermal circulation , nanocomposite , nanomaterial based catalyst , chemical engineering , catalysis , porosity , thermal decomposition , deposition (geology) , nanoparticle , nanotechnology , chemistry , composite material , organic chemistry , paleontology , sediment , engineering , biology
We report a unique successive hydrothermal deposition method for the heteroepitaxial growth of well‐dispersed crystalline Co 3 O 4 nanoparticles on single‐crystalline porous ZnO nanoplates toward a Co 3 O 4 /ZnO nanocomposite catalyst. The specific heteroepitaxial crystal faces between Co 3 O 4 and ZnO limit the size of Co 3 O 4 particles to be approximately 5 nm and allow the exposure of more active sites. The intermediate of hydrozincite [Zn 5 (CO 3 ) 2 (OH) 6 ] plays a role as template in creating porous ZnO nanoplates and oriented Co 3 O 4 grains via thermal decomposition process. The active exposure of the catalyst is probed by CO oxidation. The nanocomposite exhibits significantly enhanced catalytic efficiency towards CO oxidation at temperatures ranging from 30 to 115 °C, in comparison with a homogeneous Co 3 O 4 sample and one‐step Co/ZnO products.