期刊
NANOSCALE
卷 9, 期 16, 页码 5119-5128出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr00052a
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资金
- National Research Foundation of Korea (NRF) - Korea government MSIP [2014R1A2A1A11052414]
- C1 Gas Refinery Program through the NRF - Korea government (MSIP) [2016 M3D3A1A01913567]
- National Research Foundation of Korea [2016M3D3A1A01913251, 2014R1A2A1A11052414] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Three-dimensionally ordered macroporous (3DOM) CoFe2O4 (CFO) catalysts were prepared by using the colloidal crystal templating method to be used as bifunctional catalysts of Li-O-2 battery positive electrodes. In order to study the relationship between the macropore diameter and charge/discharge behavior, 3DOM CFO catalysts with two different pore diameters of 140 and 60 nm were prepared. The physicochemical properties of the 3DOM CFO catalysts were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. When the 3DOM CFO catalyst with a pore diameter of 140 nm (CFO@140) was used in the O2-electrode of Li-O-2 batteries, it exhibited a substantially enhanced discharge capacity (ca. 11 658.5 mA h g-1) in the first cycle. Moreover, the Li-O2 cells with the CFO@140 catalyst showed cycling stability over 47 cycles at a limited capacity of 500 mA h g-1 with a reduced potential polarization of 1.13 V, as compared with that with Ketjen Black carbon and the 3DOM CFO of 60 nm pore diameter (CFO@60). Their high cycling stability, low overpotential, high round-trip efficiency, and high rate performance suggest that these 3DOM CFO catalysts could be promising O-2-electrode catalysts for next-generation lithium-oxygen batteries.
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