甲醛在聚苯胺载铂电极上的电催化氧化  

Electrocatalytic Oxidation of Formaldehyde on Platinum Load on Polyaniline Electrode

作　　者：陈忠平[1] 褚道葆[2] 秦家成 宋常春[1] 汪徐春[1] 陈君华[1] 过家好[1] 张婷[1] 

机构地区：[1]安徽科技学院化学与材料工程学院,安徽凤阳233100 [2]安徽师范大学化学与材料科学学院,安徽芜湖241000 [3]合肥工业大学化工学院,合肥230009

出　　处：《吉林大学学报（理学版）》2014年第6期1331-1336,共6页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:20476001);安徽省高校自然科学重点基金(批准号:KJ2013A079)

摘　　要：通过电化学方法制备以金属钛为基体的聚苯胺载铂电极(Pt/PAn/Ti),并通过扫描电镜和循环伏安法对该电极进行表征.通过研究甲醛在该电极上的电催化氧化行为,考察该电极对甲醛的电催化氧化活性.结果表明:Pt/PAn/Ti电极对甲醛的电催化氧化作用与铂的沉积量有关;PAn的存在使得铂微粒分散程度更好,有效面积更大,与相同铂沉积量的Pt/Ti电极相比,甲醛在其上的正向扫描峰电流密度增加2.3倍,氧化峰电位负移40mV,反向扫描氧化峰电流密度增加5倍,氧化峰电位负移30mV;甲醛在Pt/PAn/Ti电极上正向扫描出现的氧化峰由液相传质过程控制,负向扫描的氧化峰由吸附行为控制.Polyaniline （PAn）was loaded on Ti-based metal electrode and platinum was loaded on polyaniline,and Pt/PAn/Ti was prepared by cyclic voltammetry （CV）and was characterized by SEM and CV.Electrocatalytic oxidation of formaldehyde on platinum load on polyaniline electrode was investigated by reseaching the electrocatalytic oxidation of formaldehyde on Pt/PAn/Ti electrode.The result shows that electrocatalytic oxidation of formaldehyde was related with the quantity of platinum microparticles. Platinum microparticles were dispersed better, showing bigger effective area. Compared with that of the Pt/Ti electrode with the same quantity of platinum deposited,the peak current of formaldehyde in the positive scanning was increased 2.3 times and oxidation potential was negatively shifted by about 40 mV on Pt/PAn/Ti electrode.The peak current of formaldehyde in the negative scanning was increased about 5 times and oxidation potential was negatively shifted by about 30 mV.At the same time,the result shows,too that the oxidation peak in the positive scanning was controlled by liquid phase mass transfer process and the oxidation peak in the negative scanning was＆amp;nbsp;controlled by adsorption behavior.

关 键 词：钛电极 聚苯胺 循环伏安法 电催化氧化 甲醛 

分 类 号：O646.5[理学—物理化学]