The synthesis of polypyrrole@Mn3O4/reduced graphene oxide anode with improved coulombic efficiency
The synthesis of polypyrrole@Mn3O4/reduced graphene oxide anode with improved coulombic efficiency
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提高库伦效率的聚吡咯@Mn3O4/还原氧化石墨烯负极的合成
DOI：
10.1016/j.electacta.2015.10.188
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发表时间：
2015-12
影响因子：
6.6
通讯作者：
Jianning Ding
中科院分区：
文献类型：
--
作者：
Yurong Ren;Jiawei Wang;Xiaobing Huang;Jianning Ding
采用原位转化和原位氧化聚合两步法制备了聚吡咯@Mn3O4/还原氧化石墨烯复合材料。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和拉曼光谱（Raman）对材料进行了表征。XRD分析揭示了Mn 3 O 4/还原氧化石墨烯和聚吡咯@Mn3O4/还原氧化石墨烯的形成。用还原氧化石墨烯和聚吡咯包覆的Mn 3 O 4颗粒的平均直径约为27 nm。聚吡咯@Mn3O4/还原氧化石墨烯的TEM图像表明Mn 3 O 4/还原氧化石墨烯纳米复合材料确实被透明的聚吡咯膜包覆。FT-IR研究揭示了各自材料之间的特征官能团。此外，拉曼测量证实了氧化石墨还原为还原的氧化石墨烯。电化学测试结果表明，在60 mA g − 1下，其首次放电容量约为1600 mAh g− 1，首次充放电效率达到最佳（约45%VS约70%）。聚吡咯@Mn3 O 4/还原氧化石墨烯的容量在前五个循环中可维持在约1000 mAh g-1的水平，倍率性能远优于Mn 3 O 4/石墨烯。
A two-step method consisting of an in-situ transformation and an in-situ oxidative polymerization is employed to fabricate polypyrrole@Mn3O4/reduced graphene oxide composites. The resulting materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and Raman. The XRD analysis reveals the formation of Mn3O4/reduced graphene oxide and polypyrrole@Mn3O4/reduced graphene oxide. Mn3O4particles coated with reduced graphene oxide and polypyrrole get an average diameter of ca.27 nm. The TEM images of polypyrrole@Mn3O4/reduced graphene oxide demonstrate that Mn3O4/reduced graphene oxide nanocomposites are indeed coated by a transparent polypyrrole film. The FT-IR studies disclose the characteristic functional groups between the respective materials. Moreover, Raman measurements confirm the reduction of graphite oxide to reduced graphene oxide. The result of electrochemical measurement demonstrates that it gets a high initial discharge capacity of ca.1600 mAh g−1at 60 mA g−1and the initial charge/discharge efficiency delivers a nice optimization after coated with polypyrrole (ca.45% VS ca.70%). The capacity of polypyrrole@Mn3O4/reduced graphene oxide can maintain at a level of ca.1000 mAh g−1in the first five cycles and the rate performance of it is much better than that of Mn3O4/graphene.
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