TY - JOUR
T1 - Experimental and theoretical study of Pt-ITO-graphene electrocatalysts
T2 - 241st ACS National Meeting and Exposition
AU - Shao, Yuyan
AU - Kou, Rong
AU - Mei, Donghai
AU - Viswanathan, Vilayanur
AU - Aksay, Ilhan
AU - Lin, Yuehe
AU - Wang, Yong
AU - Liu, Jun
PY - 2011
Y1 - 2011
N2 - Electrocatalysts with high stability and activity play a key role for the commercialization of polymer electrolyte membrane (PEM) fuel cells. Here we present a new electrocatalyst with significantly enhanced stability and activity. First, indium tin oxide (ITO) nanocrystals are directly grown on functionalized graphene sheets forming the ITO-graphene hybrids. Pt nanoparticles are then deposited on ITO-graphene. Transmission electron microscopy images reveal that Pt nanopacrticles are stabilized at Pt-ITO-graphene triple junction points. Periodic density functional theory calculations confirm the thermodynamically favorable formation of Pt-ITO-graphene triple junctions. The new catalyst materials are tested for oxygen reduction for potential applications in PEM fuel cells, and they exhibit over 2× higher durability and high activity, which are attributed to the special triple junction structure, high dispersion of Pt nanoparticles, and prevention of graphene from corrosion by ITO. This work present an excellent model in studying the structure-function relationship of hybrid materials and the knowledge from this study can be easily applied to novel catalysts design.
AB - Electrocatalysts with high stability and activity play a key role for the commercialization of polymer electrolyte membrane (PEM) fuel cells. Here we present a new electrocatalyst with significantly enhanced stability and activity. First, indium tin oxide (ITO) nanocrystals are directly grown on functionalized graphene sheets forming the ITO-graphene hybrids. Pt nanoparticles are then deposited on ITO-graphene. Transmission electron microscopy images reveal that Pt nanopacrticles are stabilized at Pt-ITO-graphene triple junction points. Periodic density functional theory calculations confirm the thermodynamically favorable formation of Pt-ITO-graphene triple junctions. The new catalyst materials are tested for oxygen reduction for potential applications in PEM fuel cells, and they exhibit over 2× higher durability and high activity, which are attributed to the special triple junction structure, high dispersion of Pt nanoparticles, and prevention of graphene from corrosion by ITO. This work present an excellent model in studying the structure-function relationship of hybrid materials and the knowledge from this study can be easily applied to novel catalysts design.
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M3 - Conference article
AN - SCOPUS:80051865920
SN - 0065-7727
JO - ACS National Meeting Book of Abstracts
JF - ACS National Meeting Book of Abstracts
Y2 - 27 March 2011 through 31 March 2011
ER -