Fabrication of morphology and crystal structure controlled nanorod and nanosheet cobalt hydroxide based on the difference of oxygen-solubility between water and methanol, and conversion into Co3O4

被引:134
作者
Hosono, E
Fujihara, S
Honma, I
Zhou, HS [1 ]
机构
[1] Japan Sci & Technol PRESTO, Kawaguchi, Saitama 3320012, Japan
[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[3] Keio Univ, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
关键词
D O I
10.1039/b418955h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Films of brucite-type cobalt hydroxide with nanorod morphology and hydrotalcite-type cobalt hydroxide with nanosheet morphology films were fabricated by heterogeneous nucleation in a chemical bath using water and a mixed solution of water-methanol as solvents, respectively. Since oxygen is around 25 times more soluble in methanol than in water, a methanol solution was used to convert a part of divalent cobalt ions into trivalent cobalt ions through oxidation, due to the amount of dissolved oxygen. The resultant cobalt hydroxides were of the hydrotalcite type, with a sheet-like morphology, and di- and trivalent cobalt ions. On the other hand, brucite-type hydroxides with a rod morphology, constructed using only divalent cobalt ions, were fabricated due to the scarcity of dissolved oxygen in a water-only solvents. Both the brucite and hydrotalcite types of cobalt hydroxide films were transformed into Co3O4 through pyrolysis without nanostructural deformation. The Co3O4 films were porous structures with a large surface area because both rod and sheet were constructed through nanoparticles and nanopores once the self-template was removed.
引用
收藏
页码:1938 / 1945
页数:8
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