Self-assembly formation of Bi-functional Co₃O₄/MnO₂-CNTs hybrid catalysts for achieving both high energy/power density and cyclic ability of rechargeable zinc-air battery

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DOIResolve DOI: http://doi.org/10.1038/srep33590
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TypeArticle
Journal titleScientific Reports
ISSN2045-2322
Volume6
Pages33590-133590-10
Abstractα-MnO₂ nanotubes-supported Co₃O₄ (Co₃O₄/MnO₂) and its carbon nanotubes (CNTs)-hybrids (Co₃O₄/MnO₂-CNTs) have been successfully developed through a facile two-pot precipitation reaction and hydrothermal process, which exhibit the superior bi-functional catalytic activity for both ORR and OER. The high performance is believed to be induced by the hybrid effect among MnO₂ nanotubes, hollow Co₃O₄ and CNTs, which can produce a synergetic enhancement. When integrated into the practical primary and electrochemically rechargeable Zn-air batteries, such a hybrid catalyst can give a discharge peak power density as high as 450 mW cm−². At 1.0 V of cell voltage, a current density of 324 mA cm−² is achieved. This performance is superior to all reported non-precious metal catalysts in literature for zincair batteries and significantly outperforms the state-of-the-art platinum-based catalyst. Particularly, the rechargeable Zn-air battery can be fabricated into all-solid-state one through a simple solid-state approach, which exhibits an excellent peak power density of 62 mW cm−², and the charge and discharge potentials remain virtually unchanged during the overall cycles, which is comparable to the one with liquid electrolyte.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number23000807
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Record identifier5be65895-4ca2-49b7-aeec-8f7a0733e29a
Record created2016-10-11
Record modified2016-10-11
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