聚苯胺纳米纤维修饰石墨箔电极的制备及电化学性能  

Preparation and Electrochemical Properties of Polyaniline Nanofiber Modified Graphite Foil

作　　者：桑晓光[1] 曾繁武[2] 刘晓霞[1] 

机构地区：[1]东北大学化学系,沈阳110819 [2]中国科学院金属研究所,沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《高等学校化学学报》2012年第6期1312-1318,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50973013)资助

摘　　要：以石墨箔(GF)为工作电极,采用循环伏安法(CV),通过电化学聚合,制备了聚苯胺(PANI)纳米纤维修饰GF电极(Nano-PANI/GF).利用红外光谱(FTIR)研究了Nano-PANI/GF修饰电极上聚合物的组成,利用扫描电镜(SEM)观测了Nano-PANI/GF修饰电极的表面形貌.利用循环伏安法研究了Nano-PANI/GF修饰电极在0.1 mol/L磷酸盐缓冲溶液(pH=6.9)中的电化学活性,发现Nano-PANI/GF修饰电极在中性溶液中有良好的电化学活性.Nano-PANI/GF修饰电极对抗坏血酸(AA)电化学氧化的催化作用结果表明,在0.2 V(vs.SCE)电位下,在浓度范围1.7～2.0×103μmol/L内,抗坏血酸的氧化电流与浓度呈良好线性关系,线性方程式为y=0.00013x+0.0031.修饰电极对抗坏血酸的最低检测限为1.7μmol/L(S/N=3).Polyaniline nanofiber（Nano-PANI） modified graphite foil（GF） （Nano-PANI/GF） was prepared by electrochemical polymerization of aniline on GF electrode. The polymer on the modified electrode Nano-PANI/ GF was characterized by FTIR. The morphologies of the modified electrode were investigated by SEM. The Nano-PANI/GF electrode made through cyclic voltammetric scans in a solution of 0. 1 mol/L aniline and 1.0 mol/L HC1 showed good electroactivites in 0. 1 mol/L phosphate buffer solution（ pH =6.9）. The electrocatalytic properties of the modified electrode toward ascorbic acid oxidation were studied through eyclic voltammetry and potentiometry. The current for ascorbic acid oxidation on the modified electrode at 0.2 V showed linear response to the concentration of aseorbic acid in the range of 1.7--2. 0×103μmol/L. The detection limit of ascorbic acid on the modified electrode is 1.7 μmol/L（S/N=3）.

关 键 词：聚苯胺纳米纤维 石墨箔 电化学催化 抗坏血酸 

分 类 号：O646[理学—物理化学] O631[理学—化学]