title: Supercritical preparation of hexagonal gamma-alumina nanosheets and its electrocatalytic properties.
abstract: 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 gamma-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 gamma-alumina (gamma-Al2O3) nanoparticles with a diameter of 8.48 nm were successfully prepared. The electrocatalytic properties of the nano-gamma-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.
authors.affiliation: Department of Chemistry, Lanzhou University, 730000 Lanzhou, PR China.
authors.forename: Chuanli
authors.initials: C
authors.lastname: Ma
authors.forename: Yanlong
authors.initials: Y
authors.lastname: Chang
authors.forename: Weichun
authors.initials: W
authors.lastname: Ye
authors.forename: Wei
authors.initials: W
authors.lastname: Shang
authors.forename: Chunming
authors.initials: C
authors.lastname: Wang
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D004563:Electrochemistry; D005782:Gels / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013499:Surface Properties; D014961:X-Ray Diffraction; D014965:X-Rays
chemical_list: D005782:Gels; D000537:Aluminum Oxide