Influence of ultrasound on the instantaneous synthesis of tridimensional α-Ni(OH)2 nanostructures and derived NiO nanoparticles
| Autor: | Antonio Javier Sanchez-Herencia, Zoilo Gonzalez, S. Cabanas-Polo, Begoña Ferrari |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Precipitation (chemistry) Non-blocking I/O Nucleation chemistry.chemical_element Nanotechnology General Chemistry Crystal structure Condensed Matter Physics Electrochemistry Microstructure Metal Nickel Chemical engineering chemistry visual_art visual_art.visual_art_medium General Materials Science |
| Zdroj: | CrystEngComm. 17:6193-6206 |
| ISSN: | 1466-8033 |
| DOI: | 10.1039/c5ce00876j |
| Popis: | Nickel hydroxides present an extraordinary importance in the development of electrochemical devices. In contrast to the use of ammonia as a direct precipitating agent, we present herein the instantaneous precipitation of α-Ni(OH)2 nanopowders by the addition of a nickel salt to an ammonia solution. The synthesis is based on the oversaturation of the solution in the absence of any additive or other metallic cations, where ammonia plays a role as a complexing agent for intermediate nickel compounds. The influence of ultrasound on both the microstructure and the crystalline structure is discussed and the differences are referred to a new parameter (S parameter) which quantifies the amount of power in watts per cm2 that a mol of [Ni(NH3)6]2+ experiences. The description of the nucleation and growth processes of the different powders studied led to the understanding of the effect of ultrasound on the crystallography of α-Ni(OH)2. The porosity of the samples is also evaluated and its percentage and type are also correlated to the synthesis conditions. The transformation of α-Ni(OH)2 to NiO is also considered and their optical properties are evaluated as an initial indicator of their promising use as electrochemical devices. |
| Databáze: | OpenAIRE |
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