Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 7, Pages 3575-3583Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am300639z
Keywords
layer-by-layer; multilayer; electrolyte; platinum nanoparticle; polyethylenimine; poly(3,4-ethylenedioxythiophene):poly(p-styrenesulfonate); PEDOT:PSS; fuel cell; methanol oxidation; electrocatalysis
Funding
- Advanced Materials Science and Engineering Center at Western Washington University (AMSEC WWU)
- American Chemical Society [51559-UNI10]
- WWU
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Polyethylenimine-capped platinum nanopartides (PEI-capped Pt NPs) are synthesized by photoreduction and qualified as a component for electrostatic layer-by-layer assembly and subsequent electrocatalysis. The PEI-capped Pt NPs are characterized for size and charge using scanning force microscopy, transmission electron microscopy, dynamic light scattering and zetapotential. Well-defined multilayers are produced via thin film electrostatic assembly of PEI-capped Pt NPs with the conducting polymer: poly(3,4-ethylenedioxythiophene):poly(p-styrenesulfonate) [(PEDOT:PSS)Na--(+)]. The composite thin films are subsequently characterized by ultraviolet visible spectroscopy, scanning force microscopy, inductively coupled plasma mass spectroscopy and.. thermogravimetric analysis. The layer-by-layer deposition process was found to proceed in a controlled manner which permits the fabrication of stable and uniform multilayer thin films. [PEI-capped Pt NPs/(PEDOT:PSS)] multilayers were found to be an active catalyst coating for the oxidation of methanol and a 20 bilayer film proceeds with a stable level of catalyst activity for over 1000 oxidation cycles.
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