Platinum–Dendrimer Nanocomposite Films on Gold Surfaces for Electrocatalysis |
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Authors: | S Raghu R G Nirmal J Mathiyarasu Sheela Berchmans K L N Phani V Yegnaraman |
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Affiliation: | (1) Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, Karaikudi, 630006, India |
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Abstract: | In this communication, we report a strategy for the preparation of Pt nanoparticles encapsulated in Generation 4.5 (Polyamido
amine) PAMAM dendrimer and subsequent chemical linking of the nanocomposite to the gold electrode through a self assembled
cystamine monolayer. The modification resulted in the formation of a robust electrochemically active thin film with very high
surface area, reflected by the enhanced hydrogen adsorption coverage. Interestingly, TEM images revealed self-assembly of
Pt nanoparticles and the SAED (Selected Area Electron Diffraction) patterns showed the presence of Pt single crystals (111).
The Pt-dendrimer nanocomposite film obtained using the novel modification procedure exhibited high electrocatalytic activity
for the oxidation of organic fuels like methanol, ethanol and ethylene glycol. The film did not suffer from degradation even
after repeated use in solution-phase voltammetry. It is however observed that the intermediate SAM layer and the bulky PAMAM
dendrimer (generation 4.5) have slowed down the electron transfer kinetics which is reflected by a relatively high overpotential
for methanol oxidation. Nevertheless this shortcoming is more than compensated by the existence of Pt(111) planes, which alleviate
CO poisoning. |
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Keywords: | Dendrimers Platinum– dendrimer nanocomposite Electrocatalysis Self-assembly Cystamine Template synthesis |
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