Oxygen reduction and diffusion in electroactive nanostructured membranes (ENM) ...

• Author(s): Crespilho, Frank N. ; Nart, Francisco C. ; Oliveira Jr., Osvaldo N. ; Brett, Christopher M. A.
• Date: 2007
• Persistent ID: http://hdl.handle.net/10316/5051
• Origin: Estudo Geral - Universidade de Coimbra
• Subject(s): Gold nanoparticle electrodes; Electroactive nanostructured membranes; PAMAM dendrimers; Oxygen reduction; Layer-by-layer
• Document Type: Article
• Language: English

Description

The fabrication of an electroactive nanostructured membrane (ENM) for oxygen reduction, made of layer-by-layer (LbL) films comprising Au nanoparticle-containing amine-terminated G4 PAMAM dendrimer alternated with poly(vinylsulfonic acid) (PVS) layers is reported. Electrochemical impedance spectroscopy and cyclic voltammetry show that electrodes with PVS/PAMAM-Au multiple bilayers are efficient for oxygen reduction and diffusion. A linear increase of oxygen reduction current occurs for up to 3 bilayers, with no further significant increase occurring for more than 3 bilayers. The 3-bilayer PVS/PAMAM-Au electrode, as an Au-ENM, is an attractive new system with potential for building diverse electrocatalytic devices with high molecular control. http://www.sciencedirect.com/science/article/B6TG0-4MYMFYF-9/1/8855a87cb0ee008f2c3da593edfeec53