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Title: Nitrogen-Coordinated Single Cobalt Atom Catalysts for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [6];  [6];  [7];  [4];  [8];  [3]; ORCiD logo [6]
  1. Univ. at Buffalo, NY (United States). Dept. of Chemical and Biological Engineering; East China Univ. of Science and Technology, Shanghai (China). School of Mechanical and Power Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  5. Oregon State Univ., Corvallis, OR (United States). School of Chemical, Biological, and Environmental Engineering
  6. Univ. at Buffalo, NY (United States). Dept. of Chemical and Biological Engineering
  7. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences

Due to the Fenton reaction, the presence of Fe and peroxide in electrodes generates free radicals causing serious degradation of the organic ionomer and the membrane. Pt-free and Fe-free cathode catalysts therefore are urgently needed for durable and inexpensive proton exchange membrane fuel cells (PEMFCs). In this paper, a high-performance nitrogen-coordinated single Co atom catalyst is derived from Co-doped metal-organic frameworks (MOFs) through a one-step thermal activation. Aberration-corrected electron microscopy combined with X-ray absorption spectroscopy virtually verifies the CoN4 coordination at an atomic level in the catalysts. Through investigating effects of Co doping contents and thermal activation temperature, an atomically Co site dispersed catalyst with optimal chemical and structural properties has achieved respectable activity and stability for the oxygen reduction reaction (ORR) in challenging acidic media (e.g., half-wave potential of 0.80 V vs reversible hydrogen electrode (RHE). The performance is comparable to Fe-based catalysts and 60 mV lower than Pt/C -60 μg Pt cm-2). Fuel cell tests confirm that catalyst activity and stability can translate to high-performance cathodes in PEMFCs. Finally, the remarkably enhanced ORR performance is attributed to the presence of well-dispersed CoN4 active sites embedded in 3D porous MOF-derived carbon particles, omitting any inactive Co aggregates.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. at Buffalo, NY (United States); East China Univ. of Science and Technology, Shanghai (China); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office (HFTO); USDOE Office of Science (SC); National Science Foundation (NSF); Shanghai Natural Science Foundation of China; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357; SC0012704; CBET-1604392; 16ZR1408600; 89233218CNA000001
OSTI ID:
1422592
Alternate ID(s):
OSTI ID: 1417922; OSTI ID: 1558078
Report Number(s):
LA-UR-19-27321; TRN: US1801631
Journal Information:
Advanced Materials, Vol. 30, Issue 11; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 825 works
Citation information provided by
Web of Science

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Figures / Tables (5)