Hexamethylenetetramine-assisted morphological evolution of nanowire-net and nanosheet-structured cobalt hydroxide
| Autor: | Sena Motoyama, Yoshio Abe, Midori Kawamura, Takayuki Kiba, Kyung Ho Kim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Aqueous solution
Materials science Cobalt hydroxide Mechanical Engineering Substrate (chemistry) chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry Tin oxide 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Mechanics of Materials General Materials Science Hexamethylenetetramine 0210 nano-technology Cobalt Nuclear chemistry Nanosheet |
| Zdroj: | Materials Letters. 254:154-157 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2019.07.038 |
| Popis: | Nanowire-net and nanosheet-structured cobalt hydroxide (Co(OH)2) was prepared directly on a fluorine-doped tin oxide (FTO)-coated glass substrate using aqueous solutions of cobalt nitrate hexahydrate (10 mM) and hexamethylenetetramine (HMT, 2–30 mM), synthesized at 60 °C. With increasing HMT amount, the morphology changed from nanowire-net to nanosheet, resulting from the promotion of growth under sufficient OH− ions provided by the HMT. The binder-free Co(OH)2 sample prepared with 30 mM HMT showed a good areal specific capacitance of ∼60 mF/cm2 at a scan rate of 2 mV/s, as well as excellent capacity retention (∼84% over 5000 cycles). The proposed facile method allows the morphological engineering of Co(OH)2 nanostructures with superior electrochemical performance. |
| Databáze: | OpenAIRE |
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