High-indexed Pt3Ni alloy tetrahexahedral nanoframes evolved through preferential CO etching
- State Univ. of New York at Binghamton, Binghamton, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Miami Univ., Oxford, OH (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Chinese Academy of Sciences, Shanxi (China); Synfuels China Co. Ltd., Beijing (China)
- Univ. of South Dakota, Vermillion, SD (United States)
- China Univ. of Petroleum, Shandong (China)
- Hitachi High Technologies America, Inc., Clarksburg, MD (United States)
- Miami Univ., Oxford, OH (United States); American Univ., Washington, D.C. (United States)
Here, chemically controlling crystal structures in nanoscale is challenging, yet provides an effective way to improve catalytic performances. Pt-based nanoframes are a new class of nanomaterials that have great potential as high-performance catalysts. To date, these nanoframes are formed through acid etching in aqueous solutions, which demands long reaction time and often yields ill-defined surface structures. Herein we demonstrate a robust and unprecedented protocol for facile development of high-performance nanoframe catalysts using size and crystallographic facet-controlled PtNi4 tetrahexahedral nanocrystals prepared through a colloidal synthesis approach as precursors. This new protocol employs the Mond process to preferentially dealloy nickel component in the <100> direction through carbon monoxide etching of carbon-supported PtNi4 tetrahexahedral nanocrystals at an elevated temperature. The resultant Pt3Ni alloy tetrahexahedral nanoframes possess an open, stable, and high-indexed microstructure, containing a segregated Pt thin layer strained to the Pt–Ni alloy surfaces and featuring a down-shift d-band center as revealed by the density functional theory calculations. These nanoframes exhibit much improved catalytic performance, such as high stability under prolonged electrochemical potential cycles, promoting direct electro-oxidation of formic acid to carbon dioxide and enhancing oxygen reduction reaction activities. Because carbon monoxide can be generated from the carbon support through thermal annealing in air, a common process for pretreating supported catalysts, the developed approach can be easily adopted for preparing industrial scale catalysts that are made of Pt–Ni and other alloy nanoframes.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1368669
- Report Number(s):
- BNL-113996-2017-JA; R&D Project: 16060; 16060; KC0403020
- Journal Information:
- Nano Letters, Vol. 17, Issue 4; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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