期刊
NANO LETTERS
卷 17, 期 6, 页码 3391-3395出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00046
关键词
core/shell nanoparticles; cobalt; platinum; precious metal catalysts; oxygen reduction reaction
类别
资金
- National Science Foundation [DMR-1410175]
- JHU Catalyst Award
- U.S. Department of Energy, Office of Science
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1410175] Funding Source: National Science Foundation
Precious metals have broad applications in modern industry and renewable energy technologies. The high cost and limited availability of these materials, however, have caused a grand challenge for sustainability. Here, we report on the plating of a precious metal on nonprecious metal nanoparticles for the development of sustainable electrocatalysts. Cobalt/platinum core/shell (denoted as Co@Pt) nanoparticles were synthesized via seed-mediated growth. The Co seeds were first synthesized by thermal decomposition of cobalt carbonyl, and the Pt shell was overgrown in situ by adding platinum acetylacetonate (Pt(acac)(2)). The galvanic replacement reaction between Co and the Pt precursor was successfully suppressed by taking advantage of CO (generated from the decomposition of cobalt carbonyl) as the stabilizing ligand and/or reducing agent. The obtained Co@Pt nanoparticles were further found to exhibit enhanced catalytic activity for the oxygen reduction reaction (ORR).
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