超级电容器
石墨烯
材料科学
电容
气凝胶
复合数
纤维素
储能
多孔性
电极
复合材料
纳米技术
化学工程
化学
物理
工程类
物理化学
功率(物理)
量子力学
作者
Xiuya Wang,Wei Ke,Pengbo Xie,Yuanyuan Miao,Zhenbo Liu
出处
期刊:Molecules
[MDPI AG]
日期:2021-08-12
卷期号:26 (16): 4891-4891
被引量:6
标识
DOI:10.3390/molecules26164891
摘要
With increasing energy demand driving the need for eco-friendly and efficient energy storage technology, supercapacitors are becoming increasingly prevalent in wearable devices because of their portability and stability. The performance of these supercapacitors is highly dependent on the choice of electrode material. The high capacitance and mechanical properties needed for these materials can be achieved by combining graphene’s stable electrical properties with renewable cellulose’s excellent mechanical properties into porous aerogels. In this study, graphene-cellulose hydrogels were prepared by a one-step hydrothermal method, with porous, ultra-light, and mechanically strong graphene-cellulose aerogels then prepared by freeze-drying. These composite aerogels possess excellent mechanical strength and high specific capacitance, capable of bearing about 1095 times the pressure of their own weight. Electrochemical tests show the specific capacitance of these composite aerogels can reach 202 F/g at a scanning rate of 5 mA/cm2. In view of their high surface area and fast charge transport provided by their 3D porous structure, graphene-cellulose aerogels have great potential as sustainable supercapacitor electrodes.
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