Preparation and lithium storage properties of Mo2N quantum dots@nitrogen-doped graphene composite

doi:10.11949/0438-1157.20200618

Abstract

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.

Key words: Mo₂N quantum dots, nitroden-doped graphene oxide, nanomaterials, nanostructure, electrochemistry, lithium-ion battery

摘要：

为改善钼氮化物的电化学储锂性能，以钼酸铵、六次甲基四胺及氧化石墨烯（GO）为原料，通过水热、冷冻干燥及在H₂/N₂混合气中热处理，制备了Mo₂N量子点@氮掺杂石墨烯复合材料（Mo₂N-QDs@Ngs），并探究了GO复合量对电化学储锂性能的影响。透射电子显微镜（TEM）测试结果表明：制备的Mo₂N量子点尺寸约为2~5 nm，Mo₂N量子点均匀地分布在氮掺杂石墨烯的表面。电化学测试结果表明：当GO复合量为30%时（Mo₂N-QDs@Ngs-30），制备的复合材料具有最佳的电化学储锂性能，其在0.1 A·g^-1的电流密度下具有699 mA·h·g^-1的比容量，在2 A·g^-1下仍具有286 mA·h·g^-1的比容量。

关键词: Mo₂N量子点, 氮掺杂石墨烯, 纳米材料, 纳米结构, 电化学, 锂离子电池

CLC Number:

TQ 152

WANG Lixia,ZHANG Zhenhua,LI Lei,ZHANG Linsen,FANG Hua,SONG Yanhua,LI Xiaofeng. Preparation and lithium storage properties of Mo₂N quantum dots@nitrogen-doped graphene composite[J]. CIESC Journal, 2020, 71(12): 5854-5862.

王利霞,张振华,李雷,张林森,方华,宋延华,李晓峰. Mo₂N量子点@N-掺杂石墨烯复合材料的制备及储锂性能[J]. 化工学报, 2020, 71(12): 5854-5862.

Figures/Tables 8

Fig.1 The synthesis diagram of Mo2N-QDs@Ngs samples

Fig.2 XRD patterns of Mo2N-QDs@Ngs with different GO contents

Fig.3 Raman spectra of Mo2N-QDs@Ngs

Fig.4 SEM morphology of Mo2N-QDs@Ngs-20(a), Mo2N-QDs@Ngs-30(b), Mo2N-QDs@Ngs-50 (c); TEM morphology [(d)—(e)] and SAED spectra (f) of Mo2N-QDs@Ngs-30

Fig.5 XPS spectra of the Mo2N-QDs@Ngs-30

Fig.6 CV curves of composites with different GO contents

Fig.7 Cycling and rate performance of Mo2N composited with different GO contents

Fig.8 Nyquist plots of composites with different GO contents

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Preparation and lithium storage properties of Mo₂N quantum dots@nitrogen-doped graphene composite

Mo₂N量子点@N-掺杂石墨烯复合材料的制备及储锂性能

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References 31

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