Scalable Holey Graphene Synthesis and Dense Electrode Fabrication toward High-Performance Ultracapacitors

详细信息    查看全文

• 作者：Xiaogang Han ; Michael R. Funk ; Fei Shen ; Yu-Chen Chen ; Yuanyuan Li ; Caroline J. Campbell ; Jiaqi Dai ; Xiaofeng Yang ; Jae-Woo Kim ; Yunlong Liao ; John W. Connell ; Veronica Barone ; Zhongfang Chen ; Yi Lin ; Liangbing Hu
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：8
• 期：8
• 页码：8255-8265
• 全文大小：716K
• ISSN：1936-086X

文摘

Graphene has attracted a lot of attention for ultracapacitor electrodes because of its high electrical conductivity, high surface area, and superb chemical stability. However, poor volumetric capacitive performance of typical graphene-based electrodes has hindered their practical applications because of the extremely low density. Herein we report a scalable synthesis method of holey graphene (h-Graphene) in a single step without using any catalysts or special chemicals. The film made of the as-synthesized h-Graphene exhibited relatively strong mechanical strength, 2D hole morphology, high density, and facile processability. This scalable one-step synthesis method for h-Graphene is time-efficient, cost-efficient, environmentally friendly, and generally applicable to other two-dimensional materials. The ultracapacitor electrodes based on the h-Graphene show a remarkably improved volumetric capacitance with about 700% increase compared to that of regular graphene electrodes. Modeling on individual h-Graphene was carried out to understand the excellent processability and improved ultracapacitor performance.

Keywords:

scalable synthesis; facile processability; holey graphene; dense graphene electrode; ultracapacitor; supercapacitor; volumetric capacitance