Ag、Ag_2O纳米粒子对Pb电极的电催化作用  

Synthesis of Ag and Ag_(2)O Nanoparticles and Their Electrocatalysis at Pb Electrode

作　　者：阚显文[1] 高迎春[1] 陶海升[1] 王广凤[1] 方宾[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,芜湖241000

出　　处：《应用化学》2005年第4期377-381,共5页Chinese Journal of Applied Chemistry

基　　金：国家教育部科技重点项目基金(00177);安徽省教育厅自然科学基金 (2004kj171 );安徽师范大学青年科学基金 (2003xqn13 )资助项目

摘　　要：采用化学还原方法制备了稳定的纳米银溶胶、机械搅拌和超声技术制备了纳米氧化银,并用TEM测试技术对其进行了表征,且超声条件下制备的纳米氧化银粒径最小。研究了硫酸介质中,铅电极的循环伏安行为。发现在纳米银和纳米氧化银的参与下,Pb(Ⅳ) /Pb(Ⅱ)还原峰的峰电流明显增大,表现出较好的催化活性。因表面吸附少量的Ag+,纳米氧化银在电解过程中既表现出纳米粒子的电催化性能,又表现出Ag+在电极表面的电化学性能。峰电流与扫速的一次方成正比和电极表面的SEM测试结果表明,纳米银和纳米氧化银聚集在铅电极表面。将这2种纳米粒子应用于Mn2+电氧化,使其转化率分别提高了11. 11%和18. 51%。Stable silver nanoparticles were synthesized via chemical reduction, and silver oxide nanoparticles were synthesized by means of mechanical stirring or sonicating, and both were characterized by TEM. The Ag and Ag_(2)O nanoparticles can significantly increase the reductive peak current of Pb(Ⅱ)/Pb(Ⅳ) at the Pb (electrode) which indicates that these nanoparticles have high electrocatalytic activities for the reduction of (Pb(Ⅳ)) to Pb(Ⅱ). The (appearance) of an extra reduction peak in the presence of Ag_(2)O nanoparticles indicates that they also exhibit Ag^+ electrochemistry besides the electrocatalysis behavior due to the small amount of Ag^+ adsorbed. The electrochemical behavior and the SEM images of the electrodes prove that the silver and silver oxide nanoparticles (adsorbed) and congregated on the surface of the lead electrode. In the indirected (oxidation) of Mn^(2+), the yield of the oxidative product Mn^(3+) (increased) by 11.11% or 18.51% respectively in the presence of Ag or Ag_(2)O nanoparticles.

关 键 词：银溶胶 纳米氧化银 电催化 吸附 循环伏安 

分 类 号：O646[理学—物理化学] O657[理学—化学]