钛基纳米多孔钯电极的制备及对甲酸氧化的电活性  

Novel titanium-supported nanoporous Pd electrodes and their electrocatalytic activity of formic acid oxidation

作　　者：牛凤娟[1] 易清风[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《现代化工》2010年第12期50-53,共4页Modern Chemical Industry

基　　金：国家自然科学基金(20876038);湖南省科技发展项目(2009GK3084);湖南省自然科学基金委员会与湘潭市政府自然科学联合基金(10JJ9003)

摘　　要：采用水热法,通过改变溶液组成制备了5种不同的钛基纳米多孔钯电极(Pd/PEG、Pd-EDTA/PEG、Pd-EDTA/HCHO、Pd/EG和Pd/HCHO)。扫描电镜图(SEM)分析表明,加入络合剂乙二胺四乙酸(EDTA)后,钯颗粒均匀,粒径明显减小,仅有60 nm左右。利用循环伏安法研究了甲酸在这些电极上的电催化氧化,发现在1.0 mol/L NaOH+0.5 mol/L HCOOH溶液中,加入EDTA且以甲醛作还原剂的电极(Pd-EDTA/HCHO)对甲酸氧化电流密度达132.00 mA/cm2,甲酸氧化的起始电位为-0.85 V,表明电催化活性优于其他电极。同时研究了Pd-EDTA/HCHO电极对不同浓度甲酸电催化氧化,结果表明,在一定甲酸浓度范围内,甲酸氧化的阳极电流密度随浓度的增加而增大。Five novel titanium-supported Pd electrodes （ Pd/PEG, Pd-EDTA/PEG, Pd-EDTA/HCHO, Pd/EG and Pd/HCHO） are prepared using a hydrothermal method under the condition of different solution compositions. SEM images show that in the presence of the ligand EDTA, nano-sized Pd particles, of which diameters are 60 nm, are contacted with each other to form a nanoporous texture. The electro-oxidation of formic acid on these Pd electrodes are studied with cyclic vohammograms （CV） in the 1.0 mol/L NaOH ＋ 0. 5 mol/L HCOOH solution. Pd-EDTA/HCHO exhibits＇a high anodic peak （132. 0 mA/cm^2） and a low onset potential of -0. 85 V, showing better electrocatalytic activity for formic acid oxidation than others. The effect of formic acid concentration on electrochemical characteristics of the Pd-EDTA/HCHO electrode is also investigated.

关 键 词：钯电极 纳米多孔钯 钛 甲酸氧化 电活性 

分 类 号：O646.54[理学—物理化学]