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Two-Dimensional Mesoporous Cobalt Sulfide Nanosheets as a Superior Anode for a Li-Ion Battery and a Bifunctional Electrocatalyst for the Li-O2 System
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- Authors
- Palanichamy Sennu, Maria Christy, Vanchiappan Aravindan, Young-Gi Lee, Kee Suk Nahm, Yun-Sung Lee
- Issue Date
- 2015-08
- Citation
- Chemistry of Materials, v.27, no.16, pp.5726-5735
- ISSN
- 0897-4756
- Publisher
- American Chemical Society (ACS)
- Language
- English
- Type
- Journal Article
- Abstract
- 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-O2 battery applications. A high discharge capacity of ~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 ~5917 mAh g-1 is observed with a high reversibility of 95.72% for the Li-O2 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-O2 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. (Figure Presented).
- KSP Keywords
- 2D nanostructure, Active sites, Bifunctional electrocatalyst, Charge-discharge process, Cobalt sulfide, Electrochemical energy, Electrochemical performance, Electron microscopy(SEM), Energy Storage Devices, Energy storage(ES), Ex-situ