期刊
ELECTROCHIMICA ACTA
卷 312, 期 -, 页码 11-21出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.04.178
关键词
Electrochemical exfoliation; Graphene oxide; MnO2/Graphene; Supercapacitor
资金
- Shenzhen Science and Technology Innovation Committee 2017 basic research (free exploration) project of Shenzhen City of China [JCYJ20170303170542173]
- National Natural Science Foundation of China [11174227]
- Chinese Universities Scientific Fund
This paper introduces a green, safe and effective process for mass synthesizing graphene oxide (EGO) with high yield up to 90 wt %, excellent water solubility and good quality ((<) 5 layers reach to 95%) via electrochemical exfoliation method in acidic potassium permanganate electrolyte. Furthermore, the reacted EGO electrolyte continues to undergo a one-step hydrothermal treatment for preparing the MnO2/reduced graphene oxide (MnO2/rEGO) composite, and then it is used as an electrode material of supercapacitor. Experimental results reveal that the MnO2/rEGO composite exhibits a high specific capacitance of 342.8 Fg(-1) at a current density of 0.5 Ag-1, excellent rate capability and cycling stability with 90.3% capacitance retention after 3000 cycles. A two-electrode symmetric supercapacitor assembled device is fabricated and exhibits a high specific capacitance of 226.8 Fg(-1) at 0.5 Ag-1. It shows that the MnO2/rEGO composite provides potential applications in energy storage. (C) 2019 Elsevier Ltd. All rights reserved.
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