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Title: Atomically Dispersed Iron Cathode Catalysts Derived from Binary Ligand-Based Zeolitic Imidazolate Frameworks with Enhanced Stability for PEM Fuel Cells

Journal Article · · Journal of the Electrochemical Society
 [1];  [2];  [3]; ORCiD logo [4];  [3];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Univ. at Buffalo, State University of New York, Buffalo, NY (United States)
  2. Univ. at Buffalo, State University of New York, Buffalo, NY (United States); Giner Inc., Newton, MA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Univ. at Buffalo, State University of New York, Buffalo, NY (United States); Shenzhen Univ., Shenzhen (People's Republic of China)
  5. Giner Inc., Newton, MA (United States)
  6. Shenzhen Univ., Shenzhen (People's Republic of China)

Iron-nitrogen-carbon (Fe-N-C) catalysts for oxygen reduction reaction (ORR) have exhibited a great promise to replace current platinum-based catalysts for proton exchange membrane fuel cells (PEMFCs). However, insufficient stability is the major hurdle to prohibit their practical applications. Here, we report a binary ligand strategy to synthesize Fe-doped zeolitic imidazolate framework-8 (ZIF-8) catalyst precursors through combining traditional 2-methyimidazole (mIm) and the secondary imidazolate or triazole-containing ligands. Compared to triazole-based secondary ligands, imidazolate-based ones are able to retain the shape and size of crystal particles from precursors to catalysts during thermal activation, providing great feasibility to control catalyst morphologies. Among studied ligands, integrating 2-undecylimidazole (uIm) as the secondary ligand with mIm enabled atomically dispersed Fe-N-C catalysts with high ORR activity and obviously enhanced durability in acidic electrolytes. Unlike single mIm systems, using the mIm+uIm binary ligand synthesis, increasing Fe doping content does not result in the formation of Fe-rich aggregates. The unique hollow carbon particle morphology observed with the mIm+uIm-derived catalyst leads to increased surface area allowing to accommodate more atomic FeN4 active sites. The increased order of carbon structures in the mIm+uIm-derived catalyst is likely beneficial for enhancement of catalyst stability.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE
Grant/Contract Number:
SC0012704; EE0008075
OSTI ID:
1505884
Alternate ID(s):
OSTI ID: 1508744
Report Number(s):
BNL-211576-2019-JAAM
Journal Information:
Journal of the Electrochemical Society, Vol. 166, Issue 7; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (4)

Engineering Local Coordination Environments of Atomically Dispersed and Heteroatom‐Coordinated Single Metal Site Electrocatalysts for Clean Energy‐Conversion journal November 2019
Thermally Driven Structure and Performance Evolution of Atomically Dispersed FeN 4 Sites for Oxygen Reduction journal November 2019
Thermally Driven Structure and Performance Evolution of Atomically Dispersed FeN 4 Sites for Oxygen Reduction journal November 2019
Magnetic purification of non-precious metal fuel cell catalysts for obtaining atomically dispersed Fe centers journal January 2020

Figures / Tables (7)