• 文献标题:   Development of Co0.5Ho0.5Fe2O4/graphene hybrid nanocomposites electrodes for all-solid-state printable micro-supercapacitor on flexible substrates
  • 文献类型:   Article
  • 作  者:   MAHMOUD WE, ALGHAMDI AA, ALTURKI YA, ALAMRI AM, ALSHAHRIE A
  • 作者关键词:   hybrid nanocomposite, raman charge/discharge, specific capacitance, supercapacitors mechanical
  • 出版物名称:   JOURNAL OF ALLOYS COMPOUNDS
  • ISSN:   0925-8388 EI 1873-4669
  • 通讯作者地址:  
  • 被引频次:   5
  • DOI:   10.1016/j.jallcom.2021.163564 EA JAN 2022
  • 出版年:   2022

▎ 摘  要

Herein, we report the synthesis of Co0.5Ho0.5Fe2O4/graphene hybrid nanocomposite electrodes for all-solidstate printable supercapacitor on flexible substrate using a one-step laser scribe approach. The structure, morphology, oxidation state, and elemental composition characteristics were studied using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), selected area of electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) measurements. The results revealed that the laser scribe can not only used to print the films on the flexible substrate but also has high capability to convert the graphene oxide and the cobalt, holmium and iron salts to Co0.5Ho0.5Fe2O4/graphene hybrid nanocomposite during printing this suspension on a flexible substrate. The cyclic voltammetry and the galvanostatic charge/discharge measurements revealed that the decoration of the surface of graphene with Co0.5Ho0.5Fe2O4 nanocrystals increases the operational voltage window to 1.5 V. The combination of the developed polyethylene glycol/ silica/lithium triflates (48:37:15) ionic gel with the Co0.5Ho0.5Fe2O4/graphene hybrid electrodes exhibits a capacitance of 590 F.g(-1) (204 mF.cm(-2)). Furthermore, the printed supercapacitor on the flexible substrate exhibited an energy density of 161.3 Whkg(-1) and a maximum power density of 211kWkg(-1). The developed Co0.5Ho0.5Fe2O4/1.5G hybrid nanocomposite supercapacitor showed outstanding capacitive performance under harsh mechanical conditions. (C) 2021 Published by Elsevier B.V.