Microwave-assisted synthesis of layer-by-layer ultra-large and thin NiAl-LDH/RGO nanocomposites and their excellent performance as electrodes

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• 作者：Zhuo Wang ; Wei Jia ; Menglei Jiang ; Chen Chen ; Yadong Li
• 刊名：Science China Materials
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：58
• 期：12
• 页码：944-952
• 全文大小：956 KB
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• 作者单位：Zhuo Wang (1) (2)
  Wei Jia (1)
  Menglei Jiang (1)
  Chen Chen (1)
  Yadong Li (1)
  
  1. Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing, 100084, China
  2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190, China
  
• 刊物类别：Materials Science, general; Chemistry/Food Science, general;
• 刊物主题：Materials Science, general; Chemistry/Food Science, general;
• 出版者：Science China Press
• ISSN：2199-4501

文摘

In this work, ultra-large sheet NiAl-layered double hydroxide (LDH)/reduced graphene oxide (RGO) nanocomposites were facilely synthesized via in situ growth of NiAl-LDH on a graphene surface without any surfactant or template. It was found that with a microwave-assisted method, NiAl-LDH nanosheets grew evenly on the surface of graphene. With this method, the formation of NiAl-LDH and reduction of graphene oxide were achieved in one step. The unique structure endows the electrode materials with a higher specific surface area, which is favorable for enhancing the capacity performance. The morphology and microstructure of the as-prepared composites were characterized by X-ray diffraction, Brunauer-Emmett-Teller surface area measurement, and transmission electron microscopy. The specific surface area and pore volume of the RGO/LDH composite are 108.3 m2 g−1 and 0.74 cm3 g−1, respectively, which are much larger than those of pure LDHs (19.8 m2 g−1 and 0.065 cm3 g−1, respectively). The capacitive properties of the synthesized electrodes were studied using cyclic voltammetry and electrochemical impedance spectroscopy in a three-electrode experimental setup. The specific capacitance of RGO/LDHs was calculated to be 1055 F g−1 at 1 A g−1. It could be anticipated that the synthesized electrodes will find promising applications as novel electrode materials in supercapacitors and other devices because of their outstanding characteristics of controllable capacitance and facile synthesis. 中文摘要 本文通过微波加热法设计合成了水滑石-石墨烯复合材料, 并对该材料进行了表征. 研究发现, 通过微波法合成的水滑石-石 墨烯复合材料具有超薄大片结构, 是一种“层-层”剥离的结构, 该结构有利于减少石墨烯的团聚, 形成大规模片状水滑石材料. 对材料的 电容性能表征发现, 该材料具有优异的充放电性能及良好的电化学稳定性, 是一种有潜力的超级电容器电极材料.