Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells
- Brown Univ., Providence, RI (United States). Dept. of Chemistry
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Dalhousie Univ., Halifax, NS (Canada). Dept. of Chemistry
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- 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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