Electrochemically synthesized Pt-MnO₂ composite particles for simultaneous determination of catechol and hydroquinone

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• 作者：Binesh Unnikrishnan  ; [Author Vitae] ; Pu-Liang Ru  ; [Author Vitae] ; Shen-Ming Chen ; ^{smchen78@ms15.hinet.net}  ; [Author Vitae]
• 关键词：Platinum ; MnO2 ; Hydroquinone ; Catechol ; Differential pulse voltammetry ; Simultaneous determination
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2012
• 出版时间：5 July, 2012
• 年：2012
• 卷：169
• 期：Complete
• 页码：235-242
• 全文大小：1436 K

文摘

In this work we report the simultaneous determination of catechol (CC) and hydroquinone (HQ) at electrodeposited Pt-MnO₂ particles on glassy carbon electrode. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) results revealed that spherical Pt and MnO₂ particles deposited on GCE. Electrochemical impedance spectroscopy (EIS) studies showed that Pt nanoparticles in the Pt-MnO₂ composite film help the facile transfer of electrons from MnO₂ to the GCE; thereby it decreases the electron transfer resistance (R_et) of the film. The application of the Pt-MnO₂ film for the electrocatalysis of CC and HQ was studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Well defined voltammetric peaks were obtained for a mixture of equal concentrations of HQ and CC in pH 7 with a peak potential separation of 0.12 V. The simultaneous determination of CC and HQ was done by DPV. The linear range of detection of CC is 15 ¦ÌM to 0.447 mM and HQ is 3 ¦ÌM to 0.481 mM. Simultaneous determination of HQ and CC in tap water samples has been studied. The film also detects HQ present in skin whitening cream. This report suggests that Pt-MnO₂ composite is a promising material for electrocatalytic and electroanalytical applications.