Preparation and lithium storage properties of Mo2N quantum dots@nitrogen-doped graphene composite |
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Authors: | WANG Lixia ZHANG Zhenhua LI Lei ZHANG Linsen FANG Hua SONG Yanhua LI Xiaofeng |
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Affiliation: | 1.School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, Henan, China;2.Ceramic Materials Research Center, Zhengzhou University of Light Industry, Zhengzhou 450001, Henan, China;3.Zhengzhou Key Laboratory of Green Power, Zhengzhou 450001, Henan, China |
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Abstract: | To improve the electrochemical lithium storage performance of molybdenum nitrides, Mo2N quantum dots@nitrogen-doped graphene oxide sponge (Mo2N-QDs@Ngs) was prepared by hydrothermal reaction, freeze-drying and calcination in H2/N2 mixture with ammonium molybdate ((NH4)Mo7O24·4H2O), hexamethylenetetramine (C6H12N4) and graphene oxide (GO) as raw materials. The effect of GO content on the electrochemical lithium storage performance was investigated. The transmission electron microscope (TEM) results show that the size of the prepared Mo2N quantum dots is about 2—5 nm, and the Mo2N quantum dots are uniformly distributed on the surface of nitrogen-doped graphene. The electrochemical test results show that when the GO content is 30%, the prepared Mo2N-QDs@Ngs-30 has the best electrochemical lithium storage performance, which has 699 mA·h·g-1 specific capacity at the current density of 0.1 A·g-1, and has 286 mA·h·g-1 specific capacity even at the current density of 2 A·g-1. |
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Keywords: | Mo2N quantum dots nitroden-doped graphene oxide nanomaterials nanostructure electrochemistry lithium-ion battery |
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