• 文献标题:   Super-Capacitive Performance of Manganese Dioxide/Graphene Nano-Walls Electrodes Deposited on Stainless Steel Current Collectors
  • 文献类型:   Article
  • 作  者:   AMADE R, MUYSHEGYANAVETISYAN A, GONZALEZ JM, DEL PINO AP, GYORGY E, PASCUAL E, ANDUJAR JL, SERRA EB
  • 作者关键词:   inductivelycoupled plasma, carbon nanostructure, electrochemical propertie, thermal annealing
  • 出版物名称:   MATERIALS
  • ISSN:   1996-1944
  • 通讯作者地址:   Univ Barcelona
  • 被引频次:   4
  • DOI:   10.3390/ma12030483
  • 出版年:   2019

▎ 摘  要

Graphene nano-walls (GNWs) are promising materials that can be used as an electrode in electrochemical devices. We have grown GNWs by inductively-coupled plasma-enhanced chemical vapor deposition on stainless steel (AISI304) substrate. In order to enhance the super-capacitive properties of the electrodes, we have deposited a thin layer of MnO2 by electrodeposition method. We studied the effect of annealing temperature on the electrochemical properties of the samples between 70 degrees C and 600 degrees C. Best performance for supercapacitor applications was obtained after annealing at 70 degrees C with a specific capacitance of 104 Fg(-1) at 150 mVs(-1) and a cycling stability of more than 14k cycles with excellent coulombic efficiency and 73% capacitance retention. Electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge measurements reveal fast proton diffusion (1.3 x 10(-13) cm(2)s(-1)) and surface redox reaction after annealing at 70 degrees C.