首页 | 本学科首页   官方微博 | 高级检索  
     


Effect of film thickness on the electro-reduction of molecular oxygen on electropolymerized cobalt tetra-aminophthalocyanine films
Authors:Jorge Pavez  Maritza Páez  Armelle Ringuedé  Fethi Bedioui  José H. Zagal
Affiliation:(1) Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33 Santiago, Chile;(2) Laboratoire d"rsquo"Electrochimie et Chimie Analytique, UMR CNRS-ENSCP 7575, Ecole Nationale Supérieure de Chimie de Paris, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France;(3) Present address: Departamento de Fisica, Facultad de Ciencia, Universidad de Santiago de Chile and Center for Advanced Interdisciplinary Research in Materials CIMAT, Casilla 307 Correo 2, Santiago, Chile;(4) Present address: Laboratoire de Pharmacologie Chimique et génétique, FRE CNRS-ENSCP no. 2463, U INSERM 640, Ecole Nationale Supérieure de Chimie de Paris, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
Abstract:We studied the electrocatalytic activity of cobalt tetra-aminophthalocyanine (CoTAPc) for the reduction of molecular oxygen (O2) on adsorbed monomeric and on electropolymerized films of different thicknesses on glassy carbon (GC) electrode. The polymeric films, denoted poly-CoTAPc, were first characterized by electrochemical impedance spectroscopy and it appears that the types of phenomena revealed to be occurring depend less on the film thickness in basic than in acid media. For O2 reduction, the results showed that poly-CoTAPc is more active than the monomeric CoTAPc adsorbed on GC. Indeed, rotating ring-disk electrode data showed that polymeric CoTAPc promotes the four-electron reduction of O2 to water in parallel to a two-electron reduction to give peroxide. On monomeric and thin films of poly-CoTAPc, a two-electron reduction mechanism predominates. In basic media the activity increases very slightly with thickness, whereas in acid media this increase is more pronounced. This parallels the observed behavior revealed by electrochemical impedance spectroscopy.
Keywords:Polymerized cobalt tetra-aminophthalocyanine  Oxygen reduction  Film thickness  Electrochemical impedance spectroscopy  Electrocatalysis
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号