December 1 - 6, 2024
Boston, Massachusetts

Event Supporters

2024 MRS Fall Meeting & Exhibit
EN10.05.04

Compressively Strained and Interconnected Platinum Cones with Greatly Enhanced Activity and Durability Toward Oxygen Reduction

When and Where

Dec 3, 2024
8:00pm - 10:00pm
Hynes, Level 1, Hall A

Presenter(s)

Co-Author(s)

Siyu Zhou1,Younan Xia1

Georgia Institute of Technology1

Abstract

Siyu Zhou1,Younan Xia1

Georgia Institute of Technology1
The synthesis of cone-shaped Pt nanoparticles featuring compressively-strained {111} facets by depositing Pt atoms on the vertices of Pd icosahedral nanocrystals, followed by selective removal of the Pd template via wet etching, is reported. By controlling the lateral dimensions down to ca. 3 nm, together with a thickness of ca. 2 nm, the Pt cones show greatly enhanced specific and mass activities toward oxygen reduction, with values being 2.8 and 6.4 times those of commercial Pt/C, respectively. Both the strain field and the observed activity trend are rationalized using density functional theory calculations. With the formation of ultrathin linkers among the Pt cones derived from the same Pd icosahedral seed, the interconnected Pt cones acquire stronger interactions with the carbon support, preventing them from detachment and aggregation during the catalytic reaction. Even after 20 000 cycles of accelerated durability test, the Pt cones still show a mass activity 5.3 times higher than the initial value of the Pt/C.

Keywords

crystal growth | Pt

Symposium Organizers

Cristiana Di Valentin, Università di Milano Bicocca
Chong Liu, The University of Chicago
Peter Sushko, Pacific Northwest National Laboratory
Hua Zhou, Argonne National Laboratory

Session Chairs

Chong Liu
Hua Zhou

In this Session