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Title: Fe Stabilization by Intermetallic L1 0-FePt and Pt Catalysis Enhancement in L1 0-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells

We report in this article a detailed study on how to stabilize a first-row transition metal (M) in an intermetallic L1 0-MPt alloy nanoparticle (NP) structure and how to surround the L1 0-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 L1 0-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 HClO 4 solution (both at room temperature and 60°C) and in the membrane electrode assembly (MEA) at 80°C. The L1 0-FePt/Pt catalyst has a mass activity of 0.7 A/mg Pt 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 andmore » preparing other L1 0-MPt/Pt NPs, such as L1 0-CoPt/Pt NPs, with reduced NP size as a highly efficient ORR catalyst for automotive fuel cell applications.« less
Authors:
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
Publication Date:
Report Number(s):
BNL-205665-2018-JAAM; LA-UR-18-20293
Journal ID: ISSN 0002-7863
Grant/Contract Number:
SC0012704; AC52-06NA25396; AC02-06CH11357; 21603078; 2016YFB0700600
Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 140; Journal Issue: 8; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) Scientific User Facilities Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F); Canadian Light Sources, Inc., Saskatoon, SK (Canada); National Natural Science Foundation of China (NNSFC); Materials Genome Initiative
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY; L10-FePt; Oxygen Reduction Reaction; MPt alloy nanoparticle; Energy Sciences
OSTI Identifier:
1438309
Alternate Identifier(s):
OSTI ID: 1461399

Li, Junrui, Xi, Zheng, Pan, Yung -Tin, Spendelow, Jacob S., Duchesne, Paul N., Su, Dong, Li, Qing, Yu, Chao, Yin, Zhouyang, Shen, Bo, Kim, Yu Seung, Zhang, Peng, and Sun, Shouheng. Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells. United States: N. p., Web. doi:10.1021/jacs.7b12829.
Li, Junrui, Xi, Zheng, Pan, Yung -Tin, Spendelow, Jacob S., Duchesne, Paul N., Su, Dong, Li, Qing, Yu, Chao, Yin, Zhouyang, Shen, Bo, Kim, Yu Seung, Zhang, Peng, & Sun, Shouheng. Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells. United States. doi:10.1021/jacs.7b12829.
Li, Junrui, Xi, Zheng, Pan, Yung -Tin, Spendelow, Jacob S., Duchesne, Paul N., Su, Dong, Li, Qing, Yu, Chao, Yin, Zhouyang, Shen, Bo, Kim, Yu Seung, Zhang, Peng, and Sun, Shouheng. 2018. "Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells". United States. doi:10.1021/jacs.7b12829.
@article{osti_1438309,
title = {Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells},
author = {Li, Junrui and Xi, Zheng and Pan, Yung -Tin and Spendelow, Jacob S. and Duchesne, Paul N. and Su, Dong and Li, Qing and Yu, Chao and Yin, Zhouyang and Shen, Bo and Kim, Yu Seung and Zhang, Peng and Sun, Shouheng},
abstractNote = {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.},
doi = {10.1021/jacs.7b12829},
journal = {Journal of the American Chemical Society},
number = 8,
volume = 140,
place = {United States},
year = {2018},
month = {2}
}