Simultaneous reduction, exfoliation, and nitrogen doping of graphene oxide via a hydrothermal reaction for energy storage electrode materials
Simultaneous reduction, exfoliation, and nitrogen doping of graphene oxide via a hydrothermal reaction for energy storage electrode materials
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DOI：
10.1016/j.carbon.2013.11.059
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发表时间：
2014-04
期刊：
影响因子：
10.9
通讯作者：
Hangzhou Zhang;Tapas Kuila;N. Kim;Dongyan Yu;J. Lee
中科院分区：
文献类型：
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作者：
Hangzhou Zhang;Tapas Kuila;N. Kim;Dongyan Yu;J. Lee
以（NH4） 2co3和氧化石墨烯（GO）水分散体为原料，采用水热反应法制备了氮掺杂石墨烯（NG）片。原位生成的氨在同时掺杂氮、氧化石墨烯的还原和剥离中起着重要作用。研究了（NH4）2CO3/GO质量比和反应温度对N掺杂水平的影响。x射线光电子能谱元素分析表明，NG的含氮量约为10.1 at。%，氧化石墨烯的水热还原使氧含量显著降低。随着N掺杂量的增加，纳米薄片的电化学性能有所提高。当电流密度为5 a g−1时，样品的最大比电容为295 F g−1，在130℃下处理时，样品的最大比表面积为412 m2g−1。在5000次充放电循环后，比电容保持率保持在89.8%。这些结果表明，通过这种简单的环保方法获得的NG片适合用于高性能储能电极材料。
Nitrogen (N)-doped graphene (NG) sheets were prepared using (NH4)2CO3and an aqueous dispersion of graphene oxide (GO) by an eco-friendly hydrothermal reaction. The in situ produced ammonia played an important role in the simultaneous nitrogen doping, the reduction and exfoliation of GO. The (NH4)2CO3/GO mass ratio and reaction temperature were varied to investigate the effects on the N doping level. The elemental analysis determined from the X-ray photoelectron spectroscopy showed that the nitrogen content of the NG was about 10.1 at.% and the oxygen content decreased significantly due to the hydrothermal reduction of GO. The electrochemical performances of the NG sheets increased with increasing doped N content. The highest specific capacitance of 295 F g−1at a current density of 5 A g−1and the highest specific surface area of 412 m2g−1were observed with the sample processed at 130 °C. The retention of the specific capacitance was maintained at ∼89.8% after 5000 charge–discharge cycles. These results imply that NG sheets obtained by this simple eco-friendly approach are suitable for use in high performance energy storage electrode materials.