The Kirkendall Effect for Engineering Oxygen Vacancy of Hollow Co 3 O 4 Nanoparticles toward High‐Performance Portable Zinc–Air Batteries
National University of Singapore · Peking University
Abstract
Abstract Structure and defect control are widely accepted effective strategies to manipulate the activity and stability of catalysts. On a freestanding hierarchically porous carbon microstructure, the tuning of oxygen vacancy in the embedded hollow cobaltosic oxide (Co 3 O 4 ) nanoparticles is demonstrated through the regulation of nanoscale Kirkendall effect. Starting with the embedded cobalt nanoparticles, the concentration of oxygen‐vacancy defect can vary with the degree of Kirkendall oxidation, thus regulating the number of active sites and the catalytic performances. The optimized freestanding catalyst shows among the smallest reversible oxygen overpotential of 0.74 V for catalyzing oxygen…
Citation impact
- FWCI
- 17.80
- Percentile
- 100%
- References
- 39
Authors
9Topics & keywords
- Kirkendall effect
- Overpotential
- Catalysis
- Materials science
- Nanoparticle
- Microstructure
- Oxygen
- Vacancy defect