六方γ-氧化铝纳米片的超临界制备及其电催化性能。
Supercritical preparation of hexagonal gamma-alumina nanosheets and its electrocatalytic properties.
作者信息
Ma Chuanli, Chang Yanlong, Ye Weichun, Shang Wei, Wang Chunming
机构信息
Department of Chemistry, Lanzhou University, 730000 Lanzhou, PR China.
出版信息
J Colloid Interface Sci. 2008 Jan 1;317(1):148-54. doi: 10.1016/j.jcis.2007.07.077. Epub 2007 Oct 18.
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.
通过溶胶 - 凝胶法制备氧化铝前驱体，方法是将含有尿素和0.4 M Al3 +（[尿素]/[Al3 +]比例为3.0）的水溶液回流。所得前驱体沉淀在超临界乙醇中干燥。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、场发射扫描电子显微镜（FE - SEM）、X射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）对所得的γ - 氧化铝纳米颗粒进行表征。成功制备了直径为8.48 nm的六方片状γ - 氧化铝（γ - Al2O3）纳米颗粒。通过循环伏安法（CV）研究了纳米γ - 氧化铝/碳糊电极在1.0 M H2SO4溶液中对茜素氧化的电催化性能，并观察到了优异的电催化活性。
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