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Title: Three-dimensional PtNi hollow nanochains as an enhanced electrocatalyst for the oxygen reduction reaction

Three-dimensional porous PtNi hollow nanochains are successfully synthesized via galvanic replacement method using Ni nanosponges as sacrificial templates in an aqueous solution. It is found that the composition and shell thickness of the 3D PtNi hollow nanochains can be easily controlled by tuning the concentration of Pt precursors. The as-prepared PtNi hollow nanochains with optimized composition present high electrochemical surface area (70.8 m2 g-1), which is close to that of commercial Pt/C (83 m2 g-1). Moreover, the PtNi catalyst with Pt content of ~77% presents superior electrocatalytic performance for oxygen reduction reaction compared to commercial Pt/C. It shows a mass activity of 0.58 A mgPt-1, which is around 3 times higher than that of Pt/C. This strategy may be extended to the preparation of other multimetallic nanocrystals with 3D hollow nanostructures, which are expected to present high catalytic properties.
Authors:
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Publication Date:
OSTI Identifier:
1327101
Report Number(s):
PNNL-SA-116320
Journal ID: ISSN 2050-7488; 48877; 48920; KP1704020
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Materials Chemistry. A; Journal Volume: 4; Journal Issue: 22
Publisher:
Royal Society of Chemistry
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
three-dimensional morphology; hollow nanostructures; bimetallic alloys; oxygen reduction reaction; fuel cells; Environmental Molecular Sciences Laboratory