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Radially Phase Segregated PtCu@PtCuNi Dendrite@Frame Nanocatalyst for the Oxygen Reduction Reaction.

ACS nano (2017-10-13)
Jongsik Park, Mrinal Kanti Kabiraz, Hyukbu Kwon, Suhyun Park, Hionsuck Baik, Sang-Il Choi, Kwangyeol Lee
ABSTRACT

Pt-based alloy nanoframes have shown great potential as electrocatalysts toward the oxygen reduction reaction (ORR) in fuel cells. However, the intrinsically infirm nanoframes could be severely deformed during extended electro-cyclings, which eventually leads to the loss of the initial catalytic activity. Therefore, the structurally robust nanoframe is a worthy synthetic target. Furthermore, ternary alloy phase electrocatalysts offer more opportunities in optimizing the stability and activity than binary alloy ones. Herein, we report a robust PtCuNi ternary nanoframe, structurally fortified with an inner-lying PtCu dendrite, which shows a highly active and stable catalytic performance toward ORR. Remarkably, the PtCu@PtCuNi catalyst exhibited 11 and 16 times higher mass and specific activities than those of commercial Pt/C.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Nickel(II) acetylacetonate, 95%
Sigma-Aldrich
Platinum(II) acetylacetonate, 97%
Sigma-Aldrich
Hexadecyltrimethylammonium chloride, ≥98.0% (NT)
Oleylamine, ≥98% (primary amine)