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Title: Nitrogen–doped graphitized carbon shell encapsulated NiFe nanoparticles: A highly durable oxygen evolution catalyst

Oxygen evolution reaction (OER) plays a crucial role in various energy conversion devices such as water electrolyzers and metal–air batteries. Precious metal catalysts such as Ir, Ru and their oxides are usually used for enhancing reaction kinetics but are limited by their scarcity. The challenges associated with alternative non–precious metal catalysts such as transition metal oxides and (oxy)hydroxides are their low electronic conductivity and durability. The carbon encapsulating transition metal nanoparticles are expected to address these challenges. However, the relationship between precursor compositions and catalyst properties, and the intrinsic functions of each component has been rarely studied. In this paper, we report a highly durable (no degradation after 20,000 cycles) and highly active (360 mV overpotential at 10 mA cm –2 GEO) OER catalyst derived from bimetallic metal–organic frameworks (MOFs) precursors. This catalyst consists of NiFe nanoparticles encapsulated by nitrogen–doped graphitized carbon shells. The electron–donation/deviation from Fe and tuned lattice and electronic structures of metal cores by Ni are revealed to be primary contributors to the enhanced OER activity, whereas N concentration contributes negligibly. Finally, we further demonstrated that the structure and morphology of encapsulating carbon shells, which are the key factors influencing the durability, are facilely controlled by themore » chemical state of precursors.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [6] ;  [7] ;  [4] ;  [8] ;  [2]
  1. Harbin Inst. of Technology (China). School of Chemistry and Chemical Engineering; Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Washington State Univ., Pullman, WA (United States). The Gene and Linda Voiland School of Chemical Engineering and Bioengineering
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Oregon State Univ., Corvallis, OR (United States). School of Chemical, Biological and Environmental Engineering
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
  6. Washington State Univ., Pullman, WA (United States). The Gene and Linda Voiland School of Chemical Engineering and Bioengineering
  7. Harbin Inst. of Technology (China). School of Chemistry and Chemical Engineering
  8. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Washington State Univ., Pullman, WA (United States). The Gene and Linda Voiland School of Chemical Engineering and Bioengineering
Publication Date:
Grant/Contract Number:
AC05-76RL01830; AC02-06CH11357; 21433003
Type:
Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 39; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Harbin Inst. of Technology (China)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Natural Science Foundation of China (NNSFC); China Scholarship Council
Contributing Orgs:
Washington State Univ., Pullman, WA (United States); Oregon State Univ., Corvallis, OR (United States)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Electrocatalysis; Oxygen evolution reaction; Metal–organic frameworks; Graphitized carbon shell; Encapsulated nanoparticles
OSTI Identifier:
1368554