Electrodeposited MnO2/Au composite film with improved electrocatalytic activity for oxidation of glucose and hydrogen peroxide

✍ Scribed by Yu Jun Yang; Shengshui Hu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 787 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.01.095

✦ Synopsis

The major drawback of currently used MnO 2 film sensor is the loss of electrical conductivity due to the formation of a poorly conductive MnO 2 layer. To overcome this problem, a coating in which the Au is alloyed with MnO 2 has been developed. The fabrication of the codeposited film electrode of Au and MnO 2 by using a cyclic voltammetric (CV) method was described, and systematic physical and electrochemical characterization was performed. This MnO 2 /Au film electrode enhanced MnO 2 electrocatalytic activity. The oxidation process of glucose at the codeposited MnO 2 /Au shows a well-defined peak at 0.27 V in alkaline aqueous solution. In contrast, the glucose oxidation at Au modified glassy carbon electrode (GCE) just shows a shoulder wave at 0.42 V. The experimental results indicate that the modification of MnO 2 on the surface of GCE significantly improved the electrocatalytic activity towards the oxidation of glucose. Further study shows that the MnO 2 /Au could also effectively catalyze the oxidation of hydrogen peroxide in pH 7.0 phosphate buffer solution (PBS).