Mo2N量子点@N-掺杂石墨烯复合材料的制备及储锂性能

doi:10.11949/0438-1157.20200618

化工学报 ›› 2020, Vol. 71 ›› Issue (12): 5854-5862.DOI: 10.11949/0438-1157.20200618

• 材料化学工程与纳米技术 • 上一篇

Mo₂N量子点@N-掺杂石墨烯复合材料的制备及储锂性能

王利霞^1,^2,³(),张振华¹,李雷¹,张林森^1,^2,³(),方华^1,^2,³,宋延华^1,³,李晓峰^1,³

^1.郑州轻工业大学材料与化学工程学院，河南郑州 450001
^2.郑州轻工业大学陶瓷材料研究中心，河南郑州 450001
^3.郑州市绿色化学电源重点实验室，河南郑州 450001

收稿日期:2020-05-20 修回日期:2020-07-09 出版日期:2020-12-05 发布日期:2020-12-05
通讯作者: 张林森
作者简介:王利霞(1984—)，女，博士，讲师，2014050@zzuli.edu.cn
基金资助:
国家自然科学基金项目(21506198);河南省科技攻关项目(182102210163);郑州轻工业大学众创空间孵化项目(2019ZCKJ214);大学生创新创业训练计划项目(S202010462035)

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

WANG Lixia^1,^2,³(),ZHANG Zhenhua¹,LI Lei¹,ZHANG Linsen^1,^2,³(),FANG Hua^1,^2,³,SONG Yanhua^1,³,LI Xiaofeng^1,³

^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

Received:2020-05-20 Revised:2020-07-09 Online:2020-12-05 Published:2020-12-05
Contact: ZHANG Linsen

摘要/Abstract

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

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

中图分类号:

TQ 152

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.

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.

图/表 8

图1 Mo2N-QDs@Ngs样品合成示意图

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

图2 不同GO含量的Mo2N-QDs@Ngs的XRD谱图

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

图3 Mo2N-QDs@Ngs的Raman谱图

Fig.3 Raman spectra of Mo2N-QDs@Ngs

图4 Mo2N-QDs@Ngs-20(a)、Mo2N-QDs@Ngs-30(b)、Mo2N-QDs@Ngs-50(c)的SEM图；Mo2N-QDs@Ngs-30的TEM图[(d)~(e)]和选取衍射图(f)

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

图5 Mo2N-QDs@Ngs-30的XPS谱图

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

图6 不同GO复合量的复合材料的CV曲线

Fig.6 CV curves of composites with different GO contents

图7 不同GO复合量材料的长寿命循环和倍率性能

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

图8 不同GO复合量的复合材料的交流阻抗图

Fig.8 Nyquist plots of composites with different GO contents

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Mo₂N量子点@N-掺杂石墨烯复合材料的制备及储锂性能

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

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