Synthesis of Mn3O4-anchored graphene sheet nanocomposites via a facile, fast microwave hydrothermal method and their supercapacitive behavior
Synthesis of Mn3O4-anchored graphene sheet nanocomposites via a facile, fast microwave hydrothermal method and their supercapacitive behavior
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DOI：
10.1016/j.electacta.2012.08.127
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发表时间：
2013-01-01
影响因子：
6.6
通讯作者：
Guo, Zaiping
中科院分区：
文献类型：
--
作者：
Li, Li;Seng, Kuok Hau;Guo, Zaiping
通过一种简单、有效、节能、可扩展的微波水热技术，成功合成了结晶良好的mn3o4 -锚定还原氧化石墨烯纳米复合材料，有望应用于超级电容器材料。整合这些纳米结构导致两种材料之间产生强大的协同效应，从而产生比Mn3O4纳米颗粒具有更高比电容的杂化复合材料。各种表征结果表明，Mn3O4颗粒沉积并锚定在石墨烯片上。在-0.1 V ~ 0.8 V电位范围内，扫描速率为5 mV/s时，rGO(31.6%) Mn3O4纳米复合材料的电容值达到153 F/g，远高于裸Mn3O4 （87 F/g）。更重要的是，通过x射线光电子能谱证实，在10 mV/s的循环速度下，由于电化学活化和Mn（II，III）在循环过程中氧化为Mn(IV)，纳米复合材料的电容增加了200%。在1000次循环以内没有可观察到的电容衰减。该纳米复合材料制备方法简便，电化学性能优良，可作为超级电容器的候选电极。(C) 2012 Elsevier Ltd.版权所有。
Well-crystallized Mn3O4-anchored reduced graphene oxide (rGO) nanocomposites have been successfully synthesized via a facile, effective, energy-saving, and scalable microwave hydrothermal technique for potential application as supercapacitor material. Integrating these nanostructures resulted in a strong synergistic effect between the two materials, consequently leading to a hybrid composite with higher specific capacitance compared to the bare Mn3O4 nanoparticles. The results from different sorts of characterization indicate that the Mn3O4 particles were deposited and anchored on graphene sheets. The capacitance value of the rGO(31.6%) Mn3O4 nanocomposite reached 153 F/g, much higher than that of the bare Mn3O4 (87 F/g) at a scan rate of 5 mV/s in the potential range from -0.1 V to 0.8 V. More importantly, a 200% increase in capacitance was observed for the nanocomposite with cycling at 10 mV/s due to electrochemical activation and the oxidization of Mn(II,III) to Mn(IV) during cycling, as verified by Xray photoelectron spectroscopy. There is no observable capacitance fading up to 1000 cycles. The facile synthesis method and good electrochemical properties indicate that the nanocomposite could be an electrode candidate for supercapacitors. (C) 2012 Elsevier Ltd. All rights reserved.