Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Nanomaterials Tuesday Sessions
       Session NM-TuP

Paper NM-TuP14
Synthesis of of Pt-based Bimetallic Nanoparticles using Pulsed Plasma Discharge in Water

Tuesday, December 9, 2014, 4:00 pm, Room Mauka

Session: Nanomaterials Poster Session
Presenter: SangYul Lee, Korea Aerospace University, Republic of Korea
Authors: S.Y. Lee, Korea Aerospace University, Republic of Korea
S.M. Kim, Korea Aerospace University, Kora
J.-W. Kim, InCheon University, Korea
Correspondent: Click to Email
The synthetic approach for electrocatalysts is one of the most important methods determining the electrocatalytic performance. In this work, we synthesized Pt and Pt-M (M=Cu, Ag, and Pd) bimetallic nanoparticles using a pulsed plasma discharge in water. A morphological investigation revealed that the as-synthesized Pt and Pt-M bimetallic nanoparticles constituted a nanochain network structure interconnected with primary nanoparticles, and the nanochains grew from the primary nanoparticles via the oriented attachment. The Z-contrast, EDX line scanning, and XRD analysis confirmed that the Pt was alloyed with M without elemental segregation or phase segregation. Furthermore, it was found that the composition difference was dependent on the electrode temperature determined by the power density and thermal parameters. The Pt-Pd bimetallic nanoparticles showed the largest electrochemical surface area due to a crystalline size of less than 5nm, whereas the Pt-Ag bimetallic nanoparticles showed superior electrocatalytic activity, stability, and durability with respect to the methanol oxidation reaction, which could be attributed to the downshift of the d-band center via electronic modification.