3D hollow sphere Co3O4/MnO2-CNTs: its high-performance bi-functional cathode catalysis and application in rechargeable zinc-air battery

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DOIResolve DOI: http://doi.org/10.1016/j.gee.2017.02.004
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TypeArticle
Journal titleGreen Energy & Environment
ISSN2468-0257
Volume2
Issue3
Pages316328
Subjectbi-functional catalyst; oxygen reduction reaction; oxygen evolution reaction; Activity and stability; rechargeable zinc-air battery
AbstractThere has been a continuous need for high active, excellently durable and low-cost electrocatalysts for rechargeable zinc-air batteries. Among many low-cost metal based candidates, transition metal oxides with the CNTs composite have gained increasing attention. In this paper, the 3-D hollow sphere MnO2 nanotube-supported Co3O4 nanoparticles and its carbon nanotubes hybrid material (Co3O4/MnO2-CNTs) have been synthesized via a simple co-precipitation method combined with post-heat treatment. The morphology and composition of the catalysts are thoroughly analyzed through SEM, TEM, TEM-mapping, XRD, EDX and XPS. In comparison with the commercial 20% Pt/C, Co3O4/MnO2, bare MnO2 nanotubes and CNTs, the hybrid Co3O4/MnO2-CNTs-350 exhibits perfect bi-functional catalytic activity toward oxygen reduction reaction and oxygen evolution reaction under alkaline condition (0.1 M KOH). Therefore, high cell performances are achieved which result in an appropriate open circuit voltage (∼1.47 V), a high discharge peak power density (340 mW cm−2) and a large specific capacity (775 mAh g−1 at 10 mA cm−2) for the primary Zn-air battery, a small charge–discharge voltage gap and a high cycle-life (504 cycles at 10 mA cm−2 with 10 min per cycle) for the rechargeable Zn-air battery. In particular, the simple synthesis method is suitable for a large-scale production of this bifunctional material due to a green, cost effective and readily available process.
Publication date
PublisherChinese Academy of Sciences. Institute of Process Engineering
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number23002274
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Record identifieraa5d3a06-5032-4490-9c4d-0b8df0041cea
Record created2017-09-28
Record modified2017-09-28
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