Electrocatalysis and flow-injection analysis of hydrogen peroxide at a chemically modified electrode

✍ Scribed by Zhiqiang Gao; Ari Ivaska; Pin Li; Kuaizhi Lui; Jianjun Yang

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 734 KB
• Volume: 259
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85370-l

✦ Synopsis

A chemically modified electrode for the ampemmetnc detection of hydrogen peroxide IS described By electrodeposmon of a copper heptacyanomtrosylferrate(I1) (CuHNF) film on the surface of a glassy carbon electrode, the overvoltages for both oxldatlon and reduction of hydrogen peroxide can be drastIcally decreased Qchc voltamrnetry at the resultmg modtiled electrode reveals the peresence of hvo paus of redox peaks correspondmg to the Cu(I)-Cu(II) and Fe(IIX~),NO-Fe(IIIXCN),NO redox couples, respectively The modified electrode 1s less prone to foulmg and shows enhanced sensltlvlty for hydrogen peronde Various electrochemuzal response charactenstlcs were mvestlgated When apphed as an electrochenucal sensor m a flow-mlectlon system, the modified electrode permltted detectlon of hydrogen peroxide at lower potentials than at the unmodlfled electrode surface Thus greatly unproved the seletivlty A lmear amperometnc response range Hrlth hydrogen peroxide was obtained between 0 4 PM and 1 rnM The relative standard devlatlon for 30 repetitive mJectlons with a 10 ,LLM hydrogen peromde solutlon over a 30-mm period was less than 4%