Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 39, Pages 13840-13844Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201908736
Keywords
bifunctional catalyst; electrospinning; Kirkendall effect; oxygen vacancies; zinc-air batteries
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Funding
- Beijing Natural Science Foundation [JQ18005]
- National Key RAMP
- D Program of China [2016YFB0100201]
- National Natural Science Foundation of China [51671003]
- China Postdoctoral Science Foundation [8206300174]
- Young Thousand Talented Program, NUS Hybrid-Integrated Flexible (Stretchable) Electronic Systems Program Seed Fund [R265000628133]
- Lloyd's Register Foundation, UK [R265000553597]
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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 (Co3O4) 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 reduction/evolution reactions in 0.1 m KOH. Moreover, the catalyst shows promise for substitution of noble metals to boost cathodic oxygen reactions in portable zinc-air batteries. This work provides a strategy to explore catalysts with controllable vacancy defects and desired nano-/microstructures.
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