Electrocatalysis and Flow-Injection Analysis of Hydrogen and Organic Peroxides at CuPtCl6 Chemically Modified Electrodes

✍ Scribed by Jianhong Pei; Xiao-yuan Li

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 265 KB
• Volume: 11
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/(sici)1521-4109(199911)11:16<1211::aid-elan1211>3.0.co;2-v

✦ Synopsis

Cyclic voltammetry was used to investigate the electrochemical behavior of peroxides, both hydrogen and organic, on the CuPtCl 6 aGC modi®ed electrode which displayed great electrocatalytic activity in the redox of peroxide. The results show that the electrochemical processes of peroxide on the CuPtCl 6 aGC modi®ed electrode are controlled by the diffusion of the species, and the reduction of dissolved oxygen overlaps with the reduction of H 2 O 2 , but has no in¯uence on the oxidation of H 2 O 2 . The modi®ed electrode was characterized as an electrochemical sensor for the detection of peroxide, both hydrogen and organic, in a ¯ow-injection system. The electrode exhibited a number of great advantages such as a very wide dynamic range, quite low detection limits, high stability and short response times and simple preparation. The linear relationship between the ¯ow-injection peak currents and the concentrations of H 2 O 2 is in a range of 5610 78 to 5610 73 M with a detection limit of 1610 78 M. The linear response to tert-butyl hydroperoxide (TBHP) is in a range of 1610 5 to 2610 73 M with a detection limit of 5610 76 M.