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ACS Nano. 2017 Nov 28;11(11):10844-10851. doi: 10.1021/acsnano.7b04097. Epub 2017 Oct 17.

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

Author information

1
Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS) , Seoul 02841, Korea.
2
Department of Chemistry and Research Institute for Natural Sciences, Korea University , Seoul 02841, Korea.
3
Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University , Daegu 41566, Korea.
4
Korea Basic Science Institute (KBSI) , Seoul 02841, Korea.

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.

KEYWORDS:

dendrite@frame; electrocatalysis; kinetic control; oxygen reduction reaction; phase segregation; ternary alloy

PMID:
29024581
DOI:
10.1021/acsnano.7b04097

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