Journal
SMALL
Volume 15, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201900288
Keywords
core-shell nanostructures; high-index facets; nanowires; oxygen reduction reaction; PtNi alloy skins
Categories
Funding
- National Natural Science Foundation of China [51774251]
- Hebei Natural Science Foundation for Distinguished Young Scholars [B2017203313]
- Hundred Excellent Innovative Talents Support Program in Hebei Province [SLRC2017057]
- Talent Engineering Training Funds of Hebei Provine [A201802001]
- opening project of the state key laboratory of Advanced Chemical Power Sources [SKL-ACPS-C-11]
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The catalytic performance of Pt-based catalysts for oxygen reduction reactions (ORR) can generally be enhanced by constructing high-index exposed facets (HIFs). However, the synthesis of Pt alloyed high-index skins on 1D non-Pt surfaces to further improve Pt utilization and stability remains a fundamental challenge for practical nanocrystals. In this work, Pd nanowires (NWs) are selected as a rational medium to facilitate the epitaxial growth of Pt and Ni. Based on the different nucleation and growth habits of Pt and Ni, a continuous PtNi alloy skin bounded with HIFs spiraled on a Pd core can be obtained. Here, the as-prepared helical Pd@PtNi NWs possess high HIF densities, low Pt contents, and optimized oxygen adsorption energies, demonstrating an enhanced ORR mass activity of 1.75 A mg(Pt)(-1) and a specific activity of 3.18 mA cm(-2), which are 10 times and 12 times higher than commercial Pt/C catalysts, respectively. In addition, the 1D nanostructure enables the catalyst to be highly stable after 30 000 potential sweeping cycles. This work successfully extends bulky high-indexed Pt alloys to core-shell nanostructures with the design of a new, highly efficient and stable Pt-based catalyst for fuel cells.
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