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

• Published in: ACS nano Vol. 8; no. 8; pp. 8255 - 8265
• Main Authors: Han, Xiaogang, Funk, Michael R, Shen, Fei, Chen, Yu-Chen, Li, Yuanyuan, Campbell, Caroline J, Dai, Jiaqi, Yang, Xiaofeng, Kim, Jae-Woo, Liao, Yunlong, Connell, John W, Barone, Veronica, Chen, Zhongfang, Lin, Yi, Hu, Liangbing
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 26-08-2014
• Subjects: volumetric capacitance; dense graphene electrode; scalable synthesis; facile processability; ultracapacitor; holey graphene; supercapacitor
• ISSN: 1936-0851; 1936-086X
• DOI: 10.1021/nn502635y

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.