• 文献标题:   Electrochemically Exfoliated Chlorine-Doped Graphene for Flexible All-Solid-State Micro-Supercapacitors with High Volumetric Energy Density
  • 文献类型:   Article
  • 作  者:   LIU BB, ZHANG QH, ZHANG LN, XU CX, PAN ZH, ZHOU QX, ZHOU WJ, WANG O, GU L, LIU H
  • 作者关键词:   allsolidstate device, chlorinedoped graphene, electrochemical exfoliation, high volumetric energy density, microsupercapacitor
  • 出版物名称:   ADVANCED MATERIALS
  • ISSN:   0935-9648 EI 1521-4095
  • 通讯作者地址:  
  • 被引频次:   23
  • DOI:   10.1002/adma.202106309 EA APR 2022
  • 出版年:   2022

▎ 摘  要

Graphene-constructed micro-supercapacitors (MSCs) have received considerable attention recently, as part of the prospective wearable and portable electronics, owing to their distinctive merits of well-tunable power output, robust mechanical flexibility, and long cyclability. In the current work, the focus is on the fabrication of high-quality and solution-processible chlorine-doped graphene (Cl-G) nanosheets through a handy yet eco-friendly electrochemical exfoliation process. The Cl-G is characteristic of the large lateral size of approximate to 10 mu m, abundant nanopores with sizes of as small as 2 nm, as well as numerous steps from the rugged surface. Arising from the rich chemical functionalities and structure defects, the all-solid-state MSC built by using Cl-G via a facile mask-assisted method delivers a large reversible capacity and ultrasteady charge/discharge performance, with the capacitance being maintained at 98.1% even after 250 000 cycles. The Cl-G-MSC with EMIMBF4/PVDF-HFP as the electrolyte displays a large volumetric capacitance up to 160 F cm(-3) at the scan rate of 5 mV s(-1) and high volumetric energy density of 97.9 mW h cm(-3) at the power density of 3.4 W cm(-3). The device can also output a high voltage up to 3.5 V and robust capability with 94.8% of capacitance retention upon 10 000 cycles.