High Volumetric Energy Density Hybrid Supercapacitors Based on Reduced Graphene Oxide Scrolls

Janardhanan R Rani; Ranjith Thangavel; Se-I Oh; Jeong Min Woo; Nayan Chandra Das; So-Yeon Kim; Yun-Sung Lee; Jae-Hyung Jang

doi:10.1021/acsami.7b03299

High Volumetric Energy Density Hybrid Supercapacitors Based on Reduced Graphene Oxide Scrolls

ACS Appl Mater Interfaces. 2017 Jul 12;9(27):22398-22407. doi: 10.1021/acsami.7b03299. Epub 2017 Jun 28.

Authors

Janardhanan R Rani¹, Ranjith Thangavel², Se-I Oh¹, Jeong Min Woo¹, Nayan Chandra Das¹, So-Yeon Kim¹, Yun-Sung Lee², Jae-Hyung Jang^{1

3}

Affiliations

¹ School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology , Gwangju 61005, South Korea.
² Faculty of Applied Chemical Engineering, Chonnam National University , Gwangju 61186, South Korea.
³ Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology , Gwangju 61005, South Korea.

PMID: 28613816
DOI: 10.1021/acsami.7b03299

Abstract

The low volumetric energy density of reduced graphene oxide (rGO)-based electrodes limits its application in commercial electrochemical energy storage devices that require high-performance energy storage capacities in small volumes. The volumetric energy density of rGO-based electrode materials is very low due to their low packing density. A supercapacitor with enhanced packing density and high volumetric energy density is fabricated using doped rGO scrolls (GFNSs) as the electrode material. The restacking of rGO sheets is successfully controlled through synthesizing the doped scroll structures while increasing the packing density. The fabricated cell exhibits an ultrahigh volumetric energy density of 49.66 Wh/L with excellent cycling stability (>10 000 cycles). This unique design strategy for the electrode material has significant potential for the future supercapacitors with high volumetric energy densities.

Keywords: Fe2O3; hybrid supercapacitor; rGO; scrolls; volumetric energy density.