TY - JOUR
T1 - Shape regulation of high-index facet nanoparticles by dealloying
AU - Huang, Liliang
AU - Liu, Mohan
AU - Lin, Haixin
AU - Xu, Yaobin
AU - Wu, Jinsong
AU - Dravid, Vinayak P.
AU - Wolverton, Chris
AU - Mirkin, Chad A.
N1 - Funding Information:
We thank Y. Kang for helpful discussion on electrochemistry. Funding: Supported by the Sherman Fairchild Foundation Inc.
Funding Information:
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
Publisher Copyright:
© 2019 American Association for the Advancement of Science. All rights reserved.
PY - 2019/9/13
Y1 - 2019/9/13
N2 - 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.
AB - 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.
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U2 - 10.1126/science.aax5843
DO - 10.1126/science.aax5843
M3 - Article
C2 - 31515391
AN - SCOPUS:85072150521
VL - 365
SP - 1159
EP - 1163
JO - Science
JF - Science
SN - 0036-8075
IS - 6458
ER -