Study on the electrocatalytic reduction of H2O2 at iron protoporphyrin modified electrode with a rapid rotation-scan method

✍ Scribed by Rongzhong Jiang; Shaojun Dong

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 539 KB
• Volume: 35
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(90)90054-4

✦ Synopsis

The electoehemical behaviour for H,O, reduction at iron protoporphyrin modified pyrolytic graphite (FePP/PG) electrode has been studied by cyclic voltammetry and rotating disc electrode (rde). The peak potential (E,) of the catalytic wave at FePP/PG electrode in the presence of H,03 is more positive than that (E,,,) of the adsorption wave at the same modified electrode in the absence of H,O*. The electrocatalytic kinetics for H20z reduction at rotating FePP/PG disc electrode was investigated with a rapid rotation-scan method, and the rate constants (/c) at various pH values and potentials were measured. A regular variation of k values with the electric charges (Q) passed through FePP/PG electrode during the catalytic reduction of H,O, was observed. If disc potential is negative enough, the catalytic reaction is controlled by a diffusion process. At more positive potentials it is controlled by a kinetic process. The electrocatalytic stability of the modified electrode increases with increasing solution pH, and the decrease of k with Q values becomes slower.