Casting amorphorized SnO2/MoO3 hybrid into foam-like carbon nanoflakes towards high-performance pseudocapacitive lithium storage
| Autor: | Guangcun Shan, Tianhao Yao, Hongkang Wang, Yiyi She, Sanmu Xie, Xiaogang Han, Micheal K. H. Leung, Jinkai Wang, Jian-Wen Shi, Qiaobao Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Annealing (metallurgy) chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Lithium-ion battery 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode Biomaterials Colloid and Surface Chemistry Chemical engineering chemistry Molybdenum 0210 nano-technology Porosity Tin |
| Zdroj: | Journal of Colloid and Interface Science. 547:299-308 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2019.03.108 |
| Popis: | We report an amorphorization-hybridization strategy to enhance lithium storage by casting atomically mixed amorphorized SnO2/MoO3 into porous foam-like carbon nanoflakes (denote as SnO2/MoO3@CNFs, or SMC in short), which are simply prepared by annealing tin(II)/molybdenum(IV) 2-ethylhexanoate within CNFs under ambient atmosphere at a low temperature (300 °C). The SnO2/MoO3 loading amount within CNFs can be easily adjusted by controlling the Sn/Mo/C precursors. When examined as lithium ion battery (LIB) anode materials, the amorphorized SnO2/MoO3@CNFs with carbon content of 32 wt% (also denote as SMC-32, in which the number represents the carbon content) deliver a high reversible capacity of 1120.5 mA h/g after 200 cycles at 200 mA/g and then 651.5 mA h/g after another 300 cycles at 2000 mA/g, which is much better than that of the crystalline SnO2/CNFs (carbon content of 34 wt%), MoO3/CNFs (carbon content of 22.7 wt%), or SnO2/MoO3@CNFs (with lower carbon contents of 11 and 25 wt%). The electrochemical measurements as well as the ex situ structure characterization clearly suggest that combination of amorphorization and hybridization of SnO2/MoO3 with CNFs synergistically contributes to the superior lithium storage performance with high pseudocapacitive contribution. |
| Databáze: | OpenAIRE |
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