物理化学学报 >> 2008, Vol. 24 >> Issue (05): 915-920.doi: 10.3866/PKU.WHXB20080532

研究简报 上一篇    下一篇

纳米Pt/巯基丁二酰胺铜修饰电极的制备及其电催化活性

干宁; 王鲁雁; 李天华; 王峰; 江千里   

  1. 宁波大学材料科学与化学工程学院, 新型功能材料及其制备科学国家重点实验室培育基地, 浙江 宁波 315211; 中山大学化学系, 广州 510275
  • 收稿日期:2007-10-22 修回日期:2008-01-17 发布日期:2008-05-05
  • 通讯作者: 干宁 E-mail:ganning@nbu.edu.cn

Preparaton and Electrocatalytic Activities of Nano Pt/Dimercaptosuccinic Amide Copper Modified Electrode

GAN Ning; WANG Lu-Yan; LI Tian-Hua; WANG Feng; JIANG Qian-Li   

  1. State Key Laboratory Base of Novel Functional Materials and Preparation Science, the Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang Province, P. R. China; Department of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
  • Received:2007-10-22 Revised:2008-01-17 Published:2008-05-05
  • Contact: GAN Ning E-mail:ganning@nbu.edu.cn

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摘要： 利用电沉积法将纳米Pt固定在巯基丁二酰胺铜(II)自组装金电极(Au/CuL)表面, 制备了一种纳米催化电极(Au/CuL/nano Pt). 分别以扫描电子显微镜(SEM)、原子力显微镜(AFM)、光电子能谱(XPS), 表面红外光谱(FT-IR)及电化学交流阻抗(EIS)对电极表面形貌进行了表征, 并采用循环伏安法(CV)研究了它的电化学性质. 结果表明, CuL具有良好的电化学活性并对H2O2的还原具有电催化作用, 纳米Pt可以显著增强这种催化性能. 在30 ℃、0.02 mol·L-1 PBS缓冲液(pH=6.0)中检测H2O2, 在0.00125-0.16 mmol·L-1浓度范围呈现线性响应, 相关系数为0.9960(信噪比为3), 检测极限为0.3 μmol·L-1. 该电极对H2O2电流响应灵敏度高(0.312 mA·cm-2·mmol-1·L)、检测迅速(4.3 s)、稳定性好(对46 μmol·L-1和2.8 mmol·L-1的H2O2连续测10 次, 变异系数分别为3.1%和3.9%; 保存70 d后对10 μmol·L-1 H2O2的响应为初始响应的95%).

关键词: 纳米Pt修饰电极, 巯基丁二酰胺铜(II), 电催化还原, H2O2, 循环伏安法

Abstract: Nano Pt/dimercaptosuccinic amide copper (II) (CuL) modified electrode (Au/CuL/nano Pt CME) was prepared by electrodepositing nano crystalline Pt on the surface of CuL monolayer, which was self-assembled on Au electrode (Au/CuL CME). The electrode’s electrochemical response was studied by cyclic voltammetry (CV) and its surface was characterized by scanning electron micrograph (SEM), atomic force microscope (AFM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectrum(XPS). The results indicated that the biosensor displayed excellent electrocatalytical response to the reduction of H2O2 in 0.02 mol·L-1 PBS(pH=6.0). The electrode responsed to H2O2 in the concentration range of 0.00125-0.16mmol·L-1with detection limit of 0.3 μmol·L-1 (signal/noise ratio was 3). Meanwhile, the electrode showed good sensitivity (0.312 mA·cm-2·mmol-1·L in amperometric measurements), rapid response time (4.3 s), and reproducibility for long-termuse (the variation coefficients were 3.1%and 3.9% (n=10) at 46 μmol·L-1 and 2.8 mmol·L-1 H2O2, respectively; the current maintained 95%for at least more than 70 days to 10 μmol·L-1 H2O2).

Key words: Nano Pt modified electrode, Dimercaptosuccinic amide copper (II), Electrocatalytic reduction, H2O2, Cyclic voltammetry

MSC2000: 

  • O646