title: Scalable holey graphene synthesis and dense electrode fabrication toward high-performance ultracapacitors.
abstract: 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.
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Han
authors.forename: Michael R
authors.initials: MR
authors.lastname: Funk
authors.forename: Fei
authors.initials: F
authors.lastname: Shen
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Chen
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Li
authors.forename: Caroline J
authors.initials: CJ
authors.lastname: Campbell
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Dai
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Yang
authors.forename: Jae-Woo
authors.initials: JW
authors.lastname: Kim
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Liao
authors.forename: John W
authors.initials: JW
authors.lastname: Connell
authors.forename: Veronica
authors.initials: V
authors.lastname: Barone
authors.forename: Zhongfang
authors.initials: Z
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Lin
authors.forename: Liangbing
authors.initials: L
authors.lastname: Hu