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Title: Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells

Journal Article · · Journal of the American Chemical Society
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Brown Univ., Providence, RI (United States). Dept. of Chemistry
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Dalhousie Univ., Halifax, NS (Canada). Dept. of Chemistry
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  5. Huazhong Univ. of Science and Technology, Hubei (People's Republic of China). School of Materials Science and Engineering

We report in this article a detailed study on how to stabilize a first-row transition metal (M) in an intermetallic L10-MPt alloy nanoparticle (NP) structure and how to surround the L10-MPt with an atomic layer of Pt to enhance the electrocatalysis of Pt for oxygen reduction reaction (ORR) in fuel cell operation conditions. Using 8 nm FePt NPs as an example, we demonstrate that Fe can be stabilized more efficiently in a core/shell structured L10-FePt/Pt with a 5 Å Pt shell. The presence of Fe in the alloy core induces the desired compression of the thin Pt shell, especially the 2 atomic layers of Pt shell, further improving the ORR catalysis. This leads to much enhanced Pt catalysis for ORR in 0.1 M HClO4 solution (both at room temperature and 60°C) and in the membrane electrode assembly (MEA) at 80°C. The L10-FePt/Pt catalyst has a mass activity of 0.7 A/mgPt from the half-cell ORR test and shows no obvious mass activity loss after 30,000 potential cycles between 0.6 V and 0.95 V at 80°C in the MEA, meeting the DOE 2020 target (<40% loss in mass activity). Here, we are extending the concept and preparing other L10-MPt/Pt NPs, such as L10-CoPt/Pt NPs, with reduced NP size as a highly efficient ORR catalyst for automotive fuel cell applications.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) Scientific User Facilities Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation and Fuels. Hydrogen and Fuel Cell Technologies Office (HFTO); Canadian Light Sources, Inc., Saskatoon, SK (Canada); National Natural Science Foundation of China (NSFC); Materials Genome Initiative
Grant/Contract Number:
SC0012704; AC52-06NA25396; AC02-06CH11357; 21603078; 2016YFB0700600
OSTI ID:
1438309
Alternate ID(s):
OSTI ID: 1461399
Report Number(s):
BNL-205665-2018-JAAM; LA-UR-18-20293
Journal Information:
Journal of the American Chemical Society, Vol. 140, Issue 8; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Spherical α-MnO2 Supported on N-KB as Efficient Electrocatalyst for Oxygen Reduction in Al–Air Battery journal April 2018
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Fabrication of Superior Single‐Atom Catalysts toward Diverse Electrochemical Reactions journal February 2019
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Sub‐3 nm Intermetallic Ordered Pt 3 In Clusters for Oxygen Reduction Reaction journal November 2019
High temperature self-assembly one-step synthesis of a structurally ordered PtFe catalyst for the oxygen reduction reaction journal January 2019
The application of CeO 2 -based materials in electrocatalysis journal January 2019
Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets journal December 2018
Core-Shell Polydopamine@Zr-Hemin MOFs Derived Fe-N-Doped Porous Carbon Nanospheres Electrocatalysts for the Oxygen Reduction journal January 2018
Tungsten‐Doped L1 0 ‐PtCo Ultrasmall Nanoparticles as a High‐Performance Fuel Cell Cathode journal October 2019
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Figures / Tables (6)