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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >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
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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

机译：基于水和甲醇之间氧溶解度的差异，制备形貌和晶体结构可控的纳米棒和纳米片状氢氧化钴，并将其转化为Co3O4

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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.
机译：分别在水和水-甲醇混合溶液为溶剂的化学浴中，通过非均相成核法制备了具有纳米棒形的水镁石型氢氧化钴和具有纳米片形的水滑石型氢氧化钴。由于氧气在甲醇中的溶解度比在水中的溶解度高约25倍，因此，由于溶解的氧气量，甲醇溶液用于通过氧化将一部分二价钴离子转化为三价钴离子。所得的氢氧化钴为水滑石型，具有片状形态，并具有二价和三价钴离子。另一方面，由于在纯水溶剂中溶解氧的缺乏，所以仅使用二价钴离子制造了具有棒状形态的水镁石型氢氧化物。水镁石和水滑石类型的氢氧化钴膜都可以通过热解转化为Co3O4，而不会发生纳米结构变形。 Co3O4膜是具有大表面积的多孔结构，因为一旦去除了自模板，棒和片都通过纳米颗粒和纳米孔构造。

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