Electrochemical properties of WO3-reduced graphene oxide composite powders prepared by one-pot spray pyrolysis process
| Autor: | Jong Min Won, Mun Yeong Son, Ji Hun Seo, Yun Chan Kang |
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| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Materials science Graphene Mechanical Engineering Inorganic chemistry Composite number Metals and Alloys Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Tungstate chemistry Nanocrystal Chemical engineering Mechanics of Materials law Materials Chemistry 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Journal of Alloys and Compounds. 688:647-653 |
| ISSN: | 0925-8388 |
| Popis: | In this work, we report the preparation of WO 3 -reduced graphene oxide (rGO) composite powders by spray pyrolysis process using a stable graphene oxide colloidal solution with ammonium tungstate. The ultrafine WO 3 nanocrystals below 10 nm in size are dispersed within the rGO matrix. The bare WO 3 powders prepared from the aqueous spray solution of ammonium tungstate are spherical and do not aggregate. The bare WO 3 and WO 3 -rGO composite powders show monoclinic and cubic crystal structures, respectively. The initial discharge capacities of the bare WO 3 and WO 3 -rGO composite powders at a current density of 100 mA g −1 are 771 and 941 mA h g −1 , respectively, and their initial Coulombic efficiencies are 67 and 65%, respectively. The discharge capacities of the bare WO 3 and WO 3 -rGO composite powders at the 300 th cycle are 282 and 546 mA h g −1 , respectively. |
| Databáze: | OpenAIRE |
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