Synthesis of Chemically Ordered Pt3Fe/C Intermetallic Electrocatalysts for Oxygen Reduction Reaction with Enhanced Activity and Durability via a Removable Carbon Coating

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Recently, Pt3M (M = Fe, Ni, Co, Cu, etc.) intermetallic compounds have been highlighted as promising candidates for oxygen reduction reaction (ORR) catalysts. In general, to form those intermetallic compounds, alloy phase nanoparticles are synthesized and then heat-treated at a high temperature. However, nanoparticles easily agglomerate during the heat treatment, resulting in a decrease in electrochemical surface area (ECSA). In this study, we synthesized Pt-Fe alloy nano particles and employed carbon coating to protect the nanoparticles from agglomeration during heat treatment. As a result, Pt3Fe L1(2) structure was obtained without agglomeration of the nanoparticles; the ECSA of Pt-Fe alloy and intermetallic Pt3Fe/C was 37.6 and 33.3 m(2) g(pt)(-1), respectively. Pt3Fe/C exhibited excellent mass activity (0.454 A mg(pt)(-1)) and stability with superior resistances to nanoparticle agglomeration and iron leaching. Density functional theory (DFT) calculation revealed that, owing to the higher dissolution potential of Fe atoms on the Pt3Fe surface than those on the Pt-Fe alloy, Pt3Fe/C had better stability than Pt-Fe/C. A single cell fabricated with Pt3Fe/C showed higher initial performance and superior durability, compared to that with commercial Pt/C. We suggest that Pt3M chemically ordered electrocatalysts are excellent candidates that may become the most active and durable ORR catalysts available.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-09
Language
English
Article Type
Article
Keywords

PEM FUEL-CELLS; FEPT NANOPARTICLES; CATHODE CATALYSTS; HIGH-PERFORMANCE; ORR ACTIVITY; CORE-SHELL; PT-SKIN; ALLOYS; STABILITY; PLATINUM

Citation

ACS APPLIED MATERIALS & INTERFACES, v.9, no.37, pp.31806 - 31815

ISSN
1944-8244
DOI
10.1021/acsami.7b07648
URI
http://hdl.handle.net/10203/226628
Appears in Collection
NE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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