Interpenetrating Triphase Cobalt-Based Nanocomposites as Efficient Bifunctional Oxygen Electrocatalysts for Long-Lasting Rechargeable Zn–Air Batteries
Journal Article
·
· Advanced Energy Materials
- 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
- Univ. of Waterloo, ON (Canada). Dept. of Chemical Engineering. Waterloo Inst. for Nanotechnology. Waterloo Inst. for Sustainable Energy
- Henan Normal Univ., Xinxiang (China). School of Chemistry and Chemical Engineering
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- 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)
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 Co3O4 “Janus” nanoparticles stitched in porous graphitized shells (Co/Co3O4@PGS) is synthesized via ionic exchange and redox between Co2+ 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/Co3O4@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/Co3O4@PGS within the rechargeable air electrode.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Henan Normal Univ., Xinxiang (China); National Center for Nanoscience and Technology, Beijing (China); Univ. of Waterloo, ON (Canada)
- Sponsoring Organization:
- 111 Project (China); Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NSFC); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1425093
- Report Number(s):
- BNL--203305-2018-JAAM
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 15 Vol. 8; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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