用纳米铂-多壁碳纳米管-壳聚糖修饰玻碳电极计时电流法测定过氧化氢  

Chronoamperometric Determination of H_2O_2 with the Modified Electrode of Nano Pt/MWCNT's-CTS/GCE

作　　者：黄小梅[1] 邓祥[1] 吴狄[1] 唐静[1] 

机构地区：[1]四川文理学院化学与化学工程系,达州635000

出　　处：《理化检验（化学分册）》2013年第9期1042-1045,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：四川省教育厅重点项目(11ZA169);四川省教育厅重点项目(13ZA0101);达州市2011年重点科技项目(JCYJ1119)

摘　　要：将多壁碳纳米管(MWCNT's)1mg分散在5g·L^(-1)壳聚糖溶液中,并滴涂在玻碳电极表面,将上述电极置于氯铂酸(1+99)溶液中,于电位-0.2V下电沉积90s,制得纳米铂-多壁碳纳米管-壳聚糖修饰玻破电极(nanoPt/MWCNT's-CTS/GCE)。采用扫描电子显微镜对该电极表面结构进行了表征,并用循环伏安法和计时电流法对该电极的电化学性能进行了研究。试验表明:在pH 7.0的0.1mol·L^(-1)磷酸盐底液中,该传感器对过氧化氮具有明显的电催化还原作用。过氧化氢浓度在6.30×10^(-7)~1.52×10^(-3)mol·L^(-1)范围内与还原峰电流呈线性关系,检出限(3S/N)为2.13X10^(-1)mol·L^(-1)。对0.35邪mmol·L^(-1)过氧化氢标准溶液连续测定8次,测定值的相对标准偏差(n=8)为0.27%。One mg of multi wall carbon nano tubes （MWCNT＇ s） was dispersed in 5 g ·L-1 chitosan solution, and the dispersion was dropped on the surface of glassy carbon electrode （C-CE）, which was then electrodeposited in He [PtC16 ] （1＋99） solution at -0. 2 V for 90 s to have it filmed with platinum nanoparticles on its surface. The modified electrode thus prepared was named abbreviately as nano Pt/MWCNT＇s-CTS/GCE. The microstructure of the surface of the modified electrode was characterized by SEM and its electrochemical property was studied by cyclic voltammetry and chronoamperometry. It was found that the modified electrode exhibitcd excellent electrocatalytic responses towards the reduction of H2O2. I.inear relationship between values of reduction peak current and concentration of HeO2 was obtained in the range from 6.30× 10 7 to 1.52 × 10 μmol ·L-1, with detection limit （3S/N） of 2. 13 × 10 7 tool · L -1 Precision of the method was tested at the concentration level of 0. 35 mmol· L · H2O2 standard solution for 8 determinations giving value of RSD （n=8） of 0. 27%.

关 键 词：多壁碳纳米管 纳米铂 壳聚糖 玻碳电极 过氧化氢 

分 类 号：O657[理学—分析化学]