Journal
ACS NANO
Volume 8, Issue 5, Pages 4580-4590Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn500150j
Keywords
vertically aligned; reduced graphene oxide; electrochemistry; supercapacitor
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2006-0050684]
- ISTK [B551179-13-01-01]
- National Research Foundation of Korea [2006-0050684] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Supercapacitors with porous carbon structures have high energy storage capacity. However, the porous nature of the carbon electrode, composed mainly of carbon nanotubes (CNTs) and graphene oxide (GO) derivatives, negatively impacts the volumetric electrochemical characteristics of the supercapacitors because of poor packing density (<0.5 g cm(-3)). Herein, we report a simple method to fabricate highly dense and vertically aligned reduced graphene oxide (VArGO) electrodes involving simple hand-rolling and cutting processes. Because of their vertically aligned and opened-edge graphene structure, VArGO electrodes displayed high packing density and highly efficient volumetric and areal electrochemical characteristics, very fast electrolyte ion diffusion with rectangular CV curves even at a high scan rate (20 V/s), and the highest volumetric capacitance among known rGO electrodes. Surprisingly, even when the film thickness of the VArGO electrode was increased, its volumetric and areal capacitances were maintained.
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