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Multielectrocatalysis by layer-by-layer films based on pararosaniline and vanadium-substituted phosphomolybdate
Diana M Fernandes1, Alexandra Teixeira, Cristina Freire
1REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , 4169-007 Porto, Portugal.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 21, 2015
Summary
Hybrid multilayer films of pararosaniline and polyoxometalate were fabricated using layer-by-layer assembly. These films demonstrate versatile electrocatalytic activity for multiple reactions, showing potential as multielectrocatalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Hybrid multilayer films offer tunable properties for advanced applications.
- Layer-by-layer (LbL) self-assembly is a versatile technique for fabricating functional thin films.
- Polyoxometalates (POMs) are promising redox-active materials for catalysis.
Purpose of the Study:
- To prepare and characterize hybrid multilayer films of pararosaniline (PR) and Keggin-type polyoxometalate (PMo11V).
- To investigate the electrochemical properties and permeability of the {PR/PMo11V}n multilayer films.
- To evaluate the electrocatalytic activity of the films for specific redox reactions.
Main Methods:
- Electrostatic layer-by-layer (LbL) self-assembly for film fabrication.
- Electronic spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and atomic force microscopy (AFM) for film characterization.
- Cyclic voltammetry (CV) to study electrochemical responses, permeability, and electrocatalytic activity.
Main Results:
- LbL assembly resulted in regular, stepwise growth of hybrid films.
- Characterization confirmed the presence of both PR and PMo11V components with a nonuniform distribution and rough surface morphology.
- Films exhibited distinct Mo-based and V-based redox processes and maintained permeability after multiple bilayers.
- The {PR/PMo11V}n films showed significant electrocatalytic activity for iodate reduction (Mo-based) and ascorbic acid oxidation (V-based).
Conclusions:
- The {PR/PMo11V}n multilayer films are successfully fabricated using LbL self-assembly.
- These hybrid films possess tunable electrochemical properties and maintain structural integrity.
- The films act as versatile multielectrocatalysts, demonstrating activity for distinct redox transformations.
