Pt修饰聚苯胺-WO_3复合膜电极对甲醛的电催化氧化  

Electrocatalytic Oxidation of Formaldehyde on Platinum-Modified Polyaniline-Tungsten Trioxide Composite Film Electrode

作　　者：旷亚非[1] 游军飞[1] 周海晖[1] 李云飞[1] 陈金华[1] 

机构地区：[1]湖南大学化学化工学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2007年第3期57-60,共4页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金(50473022);中国博后基金(20060400874);湖南省科技计划项目(05FJ3080;2006FJ4100);湖南大学博士后基金

摘　　要：采用脉冲电位法在钛电极表面合成了聚苯胺-三氧化钨(PANI-WO_3)复合膜．扫描电镜照片表明,粒径100～150 nm的WO_3颗粒较好地分散在纳米纤维状PANI中, WO_3在膜中的嵌入对PANI的形貌没有产生明显的影响．研究结果表明,PANI-WO_3膜具有良好的导电性,有着比单纯纳米纤维PANI更小的电化学阻抗．与Pt/PANI电极相比较, Pt/PANI-WO_3电极对甲醛的电化学氧化呈现出了更好的催化活性;在相同的PANI膜厚和Pt载量的条件下,Pt/PANI-WO_3电极对甲醛氧化催化活性是Pt/PANI电极的2～3倍．Polyaniline-tungsten trioxide （PANI-WO3） composite film was synthesized on the surface of titanium electrode by pulse potentiostatic method. The scanning of electron microscope image showed that tungsten trioxide nanoparticles with a diameter of about 100 - 150 nm dispersed in nano-fibrous polyaniline, and that the morphology of polyaniline showed no apparent variation due to WO3 insertion. PANI-WO3 film exhibited good conductivity and had smaller electrochemical impedance than polyaniline film. Pt/PANI-WO3 film electrode presented better electrocatalytic activity to formaldehyde oxidation in contrast to Pt/PANI film electrode. The electrocatalytic activity of Pt/PANI-WO3 film electrode to formaldehyde oxidation was 2-3 times as high as that of Pt/PANI film electrode under the condition of the same film thickness and Pt loading.

关 键 词：聚苯胺 三氧化钨 铂 脉冲电位法 电催化氧化 

分 类 号：O646[理学—物理化学] TM911.4[理学—化学]