期刊
CHEMISTRY OF MATERIALS
卷 27, 期 16, 页码 5726-5735出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b02364
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资金
- NST (National Research Council of Science & Technology) of the Republic of Korea
We report the synthesis of two-dimensional (2D) Co3S4 in a nanothickness sheetlike morphology via simple hydrothermal process and its application to electrochemical energy-storage devices. The presence of unique mesopores with a combination of core/shell nanoparticles in the nanosheets showed superior electrochemical performances as a negative electrode for a Li-ion battery (LIB) and an electrocatalyst in Li-O-2 battery applications. A high discharge capacity of similar to 968 mAh g(-1) is noted after 60 cycles with excellent cycling stability when evaluated as an anode for a LIB. On the other hand, the first discharge capacity of similar to 5917 mAh g(-1) is observed with a high reversibility of 95.72% for the Li-O-2 battery point of view. This exceptional electrochemical performance in both applications is mainly attributed to the presence of mesoporous with core/shell 2D nanostructure, which translates more catalytic bifunctional (oxygen reduction reaction/oxygen evolution reaction) active sites for Li-O-2 and sustains the volume variations that occur in a three-dimensional manner upon the charge-discharge process for LIB applications. Ex situ studies, such as transmission electron microscopy, X-ray photoelectron spectroscopy, and impedance spectroscopy studies, are also conducted to validate the reaction mechanisms.
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