Two Distinctive Hierarchical Products through the Hydrothermal Process for β-Co(OH)2 Reacting with NaH2PO2 and Their Morphological Effect on Electrochemical Hydrogen Storage
| Autor: | Dong Heon Lee, Hyun Jung, Myunggoo Kang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Base (chemistry) Chemistry Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Hydrothermal circulation 0104 chemical sciences Inorganic Chemistry Metal chemistry.chemical_compound Hydrolysis visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry Solubility Hexamethylenetetramine 0210 nano-technology Cobalt |
| Zdroj: | Inorganic Chemistry. 55:12626-12634 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.6b01731 |
| Popis: | This paper reports a study of the reaction behavior of β-Co(OH)2 with NaH2PO2 under hydrothermal conditions, depending on the concentration of NaOH (0–9.0 M). Uniform sized β-Co(OH)2 microplatelets, as the precursor, were prepared by the method of homogeneous precipitation using hydrolysis reaction with hexamethylenetetramine as the base. After the hydrothermal reaction, two distinctive products were obtained: cobalt phosphite [Co11(HPO3)8(OH)6] and hcp Co metal. The XRD analysis reveals that the Co11(HPO3)8(OH)6 appeared in the absence of NaOH. Then, Co11(HPO3)8(OH)6 and the hcp Co metal simultaneously appeared under 1.125 M NaOH. At 2.25–4.5 M NaOH, β-Co(OH)2 and hcp Co metal appeared concurrently, and only pure hcp Co metal appeared under 9.0 M NaOH. The FE-SEM observations indicated that the obtained particles were dendritic-like Co11(HPO3)8(OH)6 and flower-like Co metal. We found that the solubility of β-Co(OH)2 and the role of the NaH2PO2 were strongly influenced by the concentration of NaOH during ... |
| Databáze: | OpenAIRE |
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