高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (8): 1850.doi: 10.7503/cjcu20200153

• 物理化学 • 上一篇    下一篇

α-Fe2O3/石墨烯水凝胶复合材料的自组装制备及电化学性能

张卫国, 范松华, 王宏智, 姚素薇   

  1. 天津大学化工学院杉山表面技术研究室, 天津 300350
  • 收稿日期:2020-03-19 出版日期:2020-08-10 发布日期:2020-05-21
  • 通讯作者: 王宏智,男,博士,副教授,主要从事新能源材料研究.E-mail:wanghz@tju.edu.cn E-mail:wanghz@tju.edu.cn

Synthesis of Self-assembled α-Fe2O3/Graphene Hydrogel for Supercapacitors with Promising Electrochemical Properties

ZHANG Weiguo, FAN Songhua, WANG Hongzhi, YAO Suwei   

  1. Shanshan Research Office of Surface Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
  • Received:2020-03-19 Online:2020-08-10 Published:2020-05-21

摘要: 采用水热法自组装合成超薄α-Fe2O3/还原氧化石墨烯水凝胶(3DGH)复合材料.复合材料的物性表征和电化学测试结果表明,α-Fe2O3/3DGH材料呈三维多孔结构,直径约100 nm的α-Fe2O3颗粒均匀生长在还原氧化石墨烯片层上;通过调节复合材料中Fe3+的负载量,可实现α-Fe2O3颗粒的可控生长,粒径为200~30 nm;作为超级电容器的电极材料,α-Fe2O3粒径为100 nm左右时,铁负载量为40%的α-Fe2O3/3DGH复合材料具有最大的比电容(750.8 F/g,1 A/g)和循环稳定性(在10 A/g电流密度下,充放电5000次后比电容保持率为81.9%),高于纯α-Fe2O3材料的比电容(251.6 F/g,1 A/g)和循环稳定性(充放电5000次后比电容保持率为43.8%).

关键词: α-Fe2O3, 氧化石墨烯, 多孔结构, 超级电容器

Abstract: Self-assembed α-Fe2O3/reduced graphene oxide hydrogel(3DGH) composites were synthsized by facile hydrothermal method. The samples were characterized by X-ray diffraction(XRD), Raman spectroscopy(Raman), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The α-Fe2O3 nanoparticles(about 100 nm in diameter) grow on the three-dimensional porous structure of reduced graphene oxide(RGO). In addition, the particle size of α-Fe2O3 can be controlled from 200 nm to 30 nm via adjusting the loading of Fe3+. This results show that the α-Fe2O3/3DGH composite with a Fe3+ loading amount of 40% and particle size of 100 nm has the maximum specific capacitance(750.8 F/g at 1 A/g) and good cyclic performance(the specific capacitance retention is 81.9% after 5000 cycles at 10 A/g), which is higher than that of pure α-Fe2O3(251. F/g at 1 A/g and 43.8% after 5000 cycles).

Key words: α-Fe2O3, Graphene oxide, Porous framework, Supercapacitor

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