Supercritical preparation of hexagonal γ-alumina nanosheets and its electrocatalytic properties

被引：41

作者：

Ma, Chuanli ^{[1
]}

Chang, Yanlong ^{[1
]}

Ye, Weichun ^{[1
]}

Shang, Wei ^{[1
]}

Wang, Chunming ^{[1
]}

机构：

[1] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2008年 / 317卷 / 01期

基金：

中国国家自然科学基金;

关键词：

gamma-alumina; supercritical ethanol drying; electrocatalytic property; alizarin; aluminum nitrate;

D O I：

10.1016/j.jcis.2007.07.077

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (c) 2007 Published by Elsevier Inc.

引用

页码：148 / 154

页数：7

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