电化学活化玻碳电极制备铂纳米对多巴胺的电催化氧化_英文_.pdf

第 28 卷 第 2 期 上海第二工业大学学报 Vol.28 No.2 2011 年 6 月 JOURNAL OF SHANGHAI SECOND POLYTECHNIC UNIVERSITY Jun. 2011 文章编号: 1001-4543(2011)02-0117-07 Deposition of Platinum Nanoparticles on the Electrochemically Activated Glassy Carbon Electrode for Electrocatalytic Oxidation of Dopamine LI Jing, XIE Hua-qing, LI Yang (School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, P.R. China) Abstract: A pre-adsorption followed by an electrochemical reduction for deposition of Pt nanoparticles on the surface layer of electrochemically activated Glassy Carbon electrode (GCE) was reported. X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FE-SEM) and electrochemical experiments were used to characterize the conformation and property of the electrode surface. The modified electrode was used to determine dopamine (DA) in ascorbic acid (AA) solution, exhibiting stable and sensitive current response toward DA oxidation. The linear response was obtained in the range of 5.0×10-8 to 2.2×10-5 mol/L with a detection limit of 1.0×10-8 mol/L for DA (s/n = 3). The DA oxidation was controlled by the adsorption surface process. The sensor had good sensitivity, stability, anti-interference ability and reproducibility. Keywords: electrochemical activation; platinum nanoparticle; electrocatalytic reduction; dopamine 0 Introduction Glassy Carbon (GC) has become a widely utilized electrode material not only due to its good conductivity, mechanically strong and relatively stable in various chemical environment, but also due to