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Title: Interpenetrating Triphase Cobalt-Based Nanocomposites as Efficient Bifunctional Oxygen Electrocatalysts for Long-Lasting Rechargeable Zn–Air Batteries

Rational construction of atomic-scale interfaces in multiphase nanocomposites is an intriguing and challenging approach to developing advanced catalysts for both oxygen reduction (ORR) and evolution reactions (OER). In this paper, a hybrid of interpenetrating metallic Co and spinel Co 3O 4 “Janus” nanoparticles stitched in porous graphitized shells (Co/Co 3O 4@PGS) is synthesized via ionic exchange and redox between Co 2+ and 2D metal–organic-framework nanosheets. This strategy is proven to effectively establish highways for the transfer of electrons and reactants within the hybrid through interfacial engineering. Specifically, the phase interpenetration of mixed Co species and encapsulating porous graphitized shells provides an optimal charge/mass transport environment. Furthermore, the defect-rich interfaces act as atomic-traps to achieve exceptional adsorption capability for oxygen reactants. Finally, robust coupling between Co and N through intimate covalent bonds prohibits the detachment of nanoparticles. As a result, Co/Co 3O 4@PGS outperforms state-of-the-art noble-metal catalysts with a positive half-wave potential of 0.89 V for ORR and a low potential of 1.58 V at 10 mA cm -2 for OER. Finally, in a practical demonstration, ultrastable cyclability with a record lifetime of over 800 h at 10 mA cm -2 is achieved by Zn–air batteries with Co/Co 3O 4@PGS withinmore » the rechargeable air electrode.« less
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [3] ;  [4] ;  [5] ; ORCiD logo [2]
  1. National Center for Nanoscience and Technology, Beijing (China). CAS Key Lab. for Nanosystem and Hierarchical Fabrication. CAS Center for Excellence in Nanoscience; Univ. of Chinese Academy of Sciences, Beijing (China); Univ. of Waterloo, ON (Canada). Dept. of Chemical Engineering. Waterloo Inst. for Nanotechnology. Waterloo Inst. for Sustainable Energy
  2. Univ. of Waterloo, ON (Canada). Dept. of Chemical Engineering. Waterloo Inst. for Nanotechnology. Waterloo Inst. for Sustainable Energy
  3. Henan Normal Univ., Xinxiang (China). School of Chemistry and Chemical Engineering
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  5. National Center for Nanoscience and Technology, Beijing (China). CAS Key Lab. for Nanosystem and Hierarchical Fabrication. CAS Center for Excellence in Nanoscience; Univ. of Chinese Academy of Sciences, Beijing (China)
Publication Date:
Report Number(s):
BNL-203305-2018-JAAM
Journal ID: ISSN 1614-6832
Grant/Contract Number:
SC0012704; 21573083; D17007; XDA09040101
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Name: Advanced Energy Materials; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Research Org:
Univ. of Waterloo, ON (Canada); National Center for Nanoscience and Technology, Beijing (China); Henan Normal Univ., Xinxiang (China); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE; Natural Sciences and Engineering Research Council of Canada (NSERC); National Natural Science Foundation of China (NNSFC); 111 Project (China); Chinese Academy of Sciences (CAS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; 36 MATERIALS SCIENCE; interpenetrating phases; metal-organic frameworks; bifunctional electrocatalysts; Zn-air batteries
OSTI Identifier:
1425093