caa a22 4500 463252160 CHVBK 20180405153343.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10562-007-9154-1 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9154-1 Platinum-Dendrimer Nanocomposite Films on Gold Surfaces for Electrocatalysis [Elektronische Daten] [S. Raghu, R. Nirmal, J. Mathiyarasu, Sheela Berchmans, K. Phani, V. Yegnaraman] 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. Springer Science+Business Media, LLC, 2007 Dendrimers nationallicence Platinum-dendrimer nanocomposite nationallicence Electrocatalysis nationallicence Self-assembly nationallicence Cystamine nationallicence Template synthesis nationallicence Raghu S. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut Nirmal R. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut Mathiyarasu J. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut Berchmans Sheela Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut Phani K. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut Yegnaraman V. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 40-49 1011-372X 119:1-2<40 2007 119 10562 https://doi.org/10.1007/s10562-007-9154-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9154-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Raghu S. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut NATIONALLICENCE 700 1- Nirmal R. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut NATIONALLICENCE 700 1- Mathiyarasu J. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut NATIONALLICENCE 700 1- Berchmans Sheela Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut NATIONALLICENCE 700 1- Phani K. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut NATIONALLICENCE 700 1- Yegnaraman V. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, 630006, Karaikudi, India aut NATIONALLICENCE 773 0- Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 40-49 1011-372X 119:1-2<40 2007 119 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer