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• W2897066044 abstract "Low-cost and high-performance electrocatalysts for electrochemical reactions are of crucial importance for renewable and sustainable energy technologies including rechargeable metal-air batteries and fuel cells. Nanocarbon materials, as a promising alternative to replace the state-of-the-art noble metal electrocatalysts, have attracted much interest, whereas the balance of the defect engineering and electric conductivity for them is still challenging. This work reports a discrete CoOx nanoparticles (CoOx NPs) situated in N-doped graphitic carbon nanorings (CoOx@NGCR), featuring graphitic but defect-rich characteristics, through a facile process of hydrothermal synthesis and subsequent high-temperature pyrolysis with in situ catalytic graphitization. The synergy arising from defect engineering and enhanced electric conductivity as well as hollow ring-shaped nanostructure of the fabricated CoOx@NGCR significantly boost the electrocatalytic activity for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in an alkaline system. CoOx@NGCR exhibits extraordinary ORR activity in terms of the positive onset potential (0.91 V), half-wave potential (0.80 V), and large limiting current density (4.9 mA cm–2), even comparable to those of the Pt/C benchmark. Furthermore, CoOx@NGCR shows impressive performance for OER along with robust durability. High bifunctional activity and excellent stability of CoOx@NGCR are further confirmed in an assembled Zn–air battery with a high power density and long-time operation stability, revealing great potential in practical applications." @default.
• W2897066044 created "2018-10-26" @default.
• W2897066044 creator A5023639734 @default.
• W2897066044 creator A5052489050 @default.
• W2897066044 creator A5056549099 @default.
• W2897066044 creator A5064173256 @default.
• W2897066044 date "2018-10-10" @default.
• W2897066044 modified "2023-10-12" @default.
• W2897066044 title "Nitrogen-Doped Defect-Rich Graphitic Carbon Nanorings with CoO_<i>x</i> Nanoparticles as Highly Efficient Electrocatalyst for Oxygen Electrochemistry" @default.
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• W2897066044 doi "https://doi.org/10.1021/acssuschemeng.8b04406" @default.
• W2897066044 hasPublicationYear "2018" @default.
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