Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201900911
Keywords
flash reactants shuttling; multidimensional ordered architecture; self-supported electrodes; Zn-air batteries
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Waterloo
- Waterloo Institute for Nanotechnology
- NSERC
- National Research Council Canada
- Canadian Institutes of Health Research
- Province of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
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Direct growth of electrocatalysts on conductive substrates is an emerging strategy to prepare air electrodes for flexible Zn-air batteries (FZABs). However, electrocatalysts grown on conductive substrates usually suffer from disorder and are densely packed with prohibited zones, in which internal blockages shut off the active sites from catalyzing the oxygen reaction. Herein, to minimize the prohibited zones, an ordered multidimensional array assembled by 1D carbon nanotubes and 2D carbon nanoridges decorated with 0D cobalt nanoparticles (referred as MPZ-CC@CNT) is constructed on nickel foam. When the MPZ-CC@CNT is directly applied as a self-supported electrode for FZAB, it delivers a marginal voltage fading rate of 0.006 mV cycle(-1) over 1800 cycles (600 h) at a current density of 50 mA cm(-2) and an impressive energy density of 946 Wh kg(-1). Electrochemical impedance spectroscopy reveals that minimal internal resistance and electrochemical polarization, which is beneficial for the flash reactant shuttling among the triphase (i.e., oxygen, electrolyte, and catalyst) are offered by the open and ordered architecture. This advanced electrode design provides great potential to boost the electrochemical performance of other rechargeable battery systems.
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