Shape regulation of high-index facet nanoparticles by dealloying

被引：140
作者：
Huang, Liliang [1 ]
Liu, Mohan [1 ]
Lin, Haixin [2 ,3 ]
Xu, Yaobin [1 ]
Wu, Jinsong [1 ]
Dravid, Vinayak P. [1 ,2 ]
Wolverton, Chris [1 ]
Mirkin, Chad A. [1 ,2 ,3 ]
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Northwestern Univ, Int Inst Nanotechnol, Evanston, IL 60208 USA
[3] Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA
来源：
SCIENCE | 2019年 / 365卷 / 6458期
关键词：
TOTAL-ENERGY CALCULATIONS; FORMIC-ACID; METAL-CATALYSTS; SURFACE-ENERGY; FCC METALS; CRYSTAL; NANOCRYSTALS; ELECTROOXIDATION; PERFORMANCE; ELECTRODES;
D O I：
10.1126/science.aax5843
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Tetrahexahedral particles (similar to 10 to similar 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.
引用
收藏
页码：1159 / +
页数：47
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