• 文献标题:   Ultrathin graphene layer activated dendritic alpha-Fe2O3 for high performance asymmetric supercapacitors
  • 文献类型:   Article
  • 作  者:   XU YC, JIAO Y, SHEN LG, CHEN JR, LIN HJ
  • 作者关键词:   graphene layer, pseudocapacitor, omnidirectional contact, electronic conductivity, dendritic alphafe2o3
  • 出版物名称:   JOURNAL OF ALLOYS COMPOUNDS
  • ISSN:   0925-8388 EI 1873-4669
  • 通讯作者地址:   Zhejiang Normal Univ
  • 被引频次:   11
  • DOI:   10.1016/j.jallcom.2018.11.385
  • 出版年:   2019

▎ 摘  要

Poor electronic conductivity is one of the main obstacles that limit the supercapacitive performance of alpha-Fe2O3. Herein, we report an ultrathin graphene layer activation strategy for significantly boosting the electrochemical performance of electrode materials. The alpha-Fe2O3 @C still retains the alpha-Fe2O3 original dendritic architectural structure, which can provide a more effective contact between electrode and electrolyte ions. Meanwhile, the graphene layer simultaneously improves Li+ diffusion and electronic conductivity, thus leading to a greatly enhanced electrochemical performance with a high specific capacitance of 443.2 F g(-1), which is almost double the capacitance of alpha-Fe2O3 without the graphene layer. More importantly, the resultant graphene layer greatly increases the stability of dendritic alpha-Fe2O3 in electrochemical cycle testing. The asymmetric supercapacitor based on a CNT-COOH anode and graphene layer-activated dendritic alpha-Fe2O3 cathode can achieve a high energy density of 77 W h Kg(-1) at a power density of 1380 W kg(-1). Our work provides a simple, novel and effective strategy to significantly enhance the electrochemical performance of alpha-Fe2O3. (C) 2018 Elsevier B.V. All rights reserved.