Analytical Sciences

Abstract − Analytical Sciences, 21(4), 377 (2005).

Electrocatalytic Oxidation of Hydrogen Peroxide and Cysteine at a Glassy Carbon Electrode Modified with Platinum Nanoparticle-deposited Carbon Nanotubes
Jianping LI,* Qiaoling YU,* and Tuzhi PENG**
*Department of Material and Chemistry Engineering, Guilin University of Technology, Guilin, 541004, P. R. China
**Department of Chemistry, Zhejiang University, Hangzhou, 310028, P. R. China
A glassy carbon electrode modified with platinum nanoparticle-decorated carbon nanotubes (Pt-CNT/GCE) was prepared. The electrochemical behaviors for the catalysis oxidations of hydrogen peroxide and cysteine were studied. The Pt-CNT/GCE showed catalytic activity for electro-oxidation of hydrogen peroxide at 0.6 V in PBS (pH = 7.0) and for that of cysteine at 0.55 V in sulfuric acid medium (pH ≤ 2). The results indicated that the peak currents were proportional to the concentrations of both hydrogen peroxide and cysteine; the currents at Pt-CNT/GCE were almost 3-times higher than that at Pt electrode. The electrocatalytic oxidation mechanisms for hydrogen peroxide and cysteine at Pt-CNT/GCE surface were briefly studied.