Abstract
Tetrahexahedral particles (~10 to ~500 nanometers) composed of platinum (Pt), palladium, rhodium, nickel, and cobalt, as well as a library of bimetallic compositions, were synthesized on silicon wafers and on catalytic supports by a ligand-free, solid-state reaction that used trace elements [antimony (Sb), bismuth (Bi), lead, or tellurium] to stabilize high-index facets. Both simulation and experiment confirmed that this method stabilized the {210} planes. A study of the PtSb system showed that the tetrahexahedron shape resulted from the evaporative removal of Sb from the initial alloy—a shape-regulating process fundamentally different from solution-phase, ligand-dependent processes. The current density at a fixed potential for the electro-oxidation of formic acid with a commercial Pt/carbon catalyst increased by a factor of 20 after transformation with Bi into tetrahexahedral particles.
Original language | English (US) |
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Pages (from-to) | 1159-1163 |
Number of pages | 5 |
Journal | Science |
Volume | 365 |
Issue number | 6458 |
DOIs | |
State | Published - Sep 13 2019 |
Funding
We thank Y. Kang for helpful discussion on electrochemistry. Funding: Supported by the Sherman Fairchild Foundation Inc. We thank Y. Kang for helpful discussion on electrochemistry. Funding: Supported by the Sherman Fairchild Foundation Inc. (synthesis and characterization of monometallic particles), the Center for Bio-Inspired Energy Science, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under award DE-SC0000989 (synthesis of electrocatalysts), and Kairos Ventures (synthesis and characterization of bimetallic nanoparticles). M.L. and C.W. acknowledge support from the Toyota Research Institute. This project made use of the EPIC facility of Northwestern University?s NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the
ASJC Scopus subject areas
- General