Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201702900
Keywords
bifunctional electrocatalysts; interpenetrating phases; metal-organic frameworks; Zn-air batteries
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- National Natural Science Foundation [21573083]
- University of Waterloo
- Waterloo Institute for Nanotechnology
- 111 Project [D17007]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09040101]
- University of Chinese Academy of Sciences (UCAS) Joint Ph.D. Training Program
Ask authors/readers for more resources
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). Herein, 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. 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available