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| Title: | SYNTHESES OF MIXED LAYERED NICKEL HYDROXIDE MANGANESE OXIDES BY HYDROTHERMAL INTERCALATION REACTION AND EXFOLIATION-RESTACKING HYDROTHERMAL REACTION | |
| DOI No: | 10.1142/9789812776846_0081 | |
| Source: | FRONTIERS OF SOLID STATE CHEMISTRY (pp 577-583) | |
| Author(s): | YAOHUA XU
Department of Chemistry, Jilin University, Changchun, 130023, P. R. China SHOUHUA FENG Department of Chemistry, Jilin University, Changchun, 130023, P. R. China WENQIN PANG Department of Chemistry, Jilin University, Changchun, 130023, P. R. China QI FENG Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20, Hayashi-cho, Takamatsu, 761-0396, Japan KOJI KAJIYOSHI Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Akebono-cho, Kochi-shi, 780-8520, Japan KAZUMICHI YANAGISAWA Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Akebono-cho, Kochi-shi, 780-8520, Japan |
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| Abstract: | A series of Ni(OH)2-manganese oxide (NMO) compounds with a mixed layered structure were synthesized by inserting nickel hydroxide into layered manganese oxides, Na-birnessite (NaBir) and Ni-birnessite (NiBir), under hydrothermal conditions. The hydrothermal intercalation reaction and the NMO compounds were investigated. Ni(OH)2 is preferentially formed in the interlayer space of the birnessites rather than as free Ni(OH)2. The mixed layered Ni(OH)2-manganese oxide with Ni(OH)2 content up to Ni/Mn= 1/2 can be obtained by using the hydrothermal intercalation method and Ni/Mn =1 by exfoliation-restacking hydrothermal reaction method. Ni(OH)2 was more easily inserted into NiBir than into NaBir under the hydrothermal conditions when the molar ratio of Ni/Mn is in some extent. A mechanism of topotactic insertion reaction was proposed for the formation of the mixed layered compounds. The mixed layered NMO can be also prepared by hydrothermal treatment of NaBir in Ni(Ac)2. solution below 250°C. The NMO compounds were stable up to 300°C in air, and transformed to other phases over this temperature. | |
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