Ni(OH)2 particles synthesized by high energy ball milling
| Autor: | Qiang Xu, Zhiyuan Tang, Yuan-gang Liu, Yong Liu, Xiao-yang Zhang |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Chemistry
Metallurgy Metals and Alloys chemistry.chemical_element Geotechnical Engineering and Engineering Geology Condensed Matter Physics Electrochemistry Metal Crystal chemistry.chemical_compound Nickel Crystallography visual_art Materials Chemistry visual_art.visual_art_medium Molecule Hydroxide Thermal stability Ball mill |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 16:1218-1222 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(06)60404-4 |
| Popis: | High energy ball milling(HEBM) method was applied to synthesize nickel hydroxide with and without partial substitution for Ni(superscript 2+) sites by such metallic ions as Al(superscript 3+), Al(superscript 3+)Zn(superscript 2+) and Al(superscript 3+)Zn(superscript 2+)Co(superscript 2+). The morphologies, structures, composition and thermal stability of the prepared powders were studied by SEM, XRD, FTIR and TG. The results reveal that all the synthesized Ni(OH)2 particles agglomerate in sub-micron sizes and the non-substituted Ni(OH)2 is composed of beta phase with a crystal interlayer distance of 4.64A, while the Al(superscript 3+), Al(superscript 3+)Zn(superscript 2+), Al(superscript 3+)Zn(superscript 2+)Co(superscript 2+) substituted products are composed of alpha phase with 8.03A crystal interlayer space. Absorbed water molecule is found in all the synthesized Ni(OH)2 and the non-substituted particles are more thermally stable than substituted ɑ-Ni(OH)2. The absorption peaks of inserted crystal anions of CO(superscript 2- subscript 3) and SO(superscript 2- subscript 4) are detected for metallic ion substituted ɑ-Ni(OH)2. The specific capacity of Al(superscript 3+) substituted Ni(OH)2 is 325mA•h/g, 5mA•h/g higher than Al(superscript 3+)Zn(superscript 3+) substituted and non-substituted Ni(OH)2, but 25mA•h/g greater than Al(superscript 3+)Zn(superscript 2+)Co(superscript 2+) substituted Ni(OH)2. The electrochemical mechanism of synthesized Ni(OH)2 electrodes is discussed by EIS spectrum and Al(superscript 3+) substituted Ni(OH)2 electrode shows a high electrochemical cyclic stability. |
| Databáze: | OpenAIRE |
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