کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
611877 | 880687 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Supercritical preparation of hexagonal γ-alumina nanosheets and its electrocatalytic properties Supercritical preparation of hexagonal γ-alumina nanosheets and its electrocatalytic properties](/preview/png/611877.png)
Alumina precursors were prepared via a sol–gel process by refluxing aqueous solutions containing urea and 0.4 M Al3+ (the [urea]/[Al3+] ratio was 3.0). The obtained precursor precipitates were dried in supercritical ethanol. The resultant γ-alumina nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrometry (FTIR). Hexagonal sheet γ-alumina (γ-Al2O3) nanoparticles with a diameter of 8.48 nm were successfully prepared. The electrocatalytic properties of the nano-γ-alumina/carbon paste electrode for oxidation of alizarin in 1.0 M H2SO4 solution have been investigated by cyclic voltammetry (CV), and excellent electrocatalytic activity was observed.
Hexagonal γ-alumina nanosheets have been successfully prepared by supercritical ethanol drying. Its high electrocatalytic activity was confirmed by the voltammograms of 5 mM alizarin at different scan rates.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 317, Issue 1, 1 January 2008, Pages 148–154