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Effect of pristine graphene incorporation on charge storage mechanism of three-dimensional graphene oxide: superior energy and power density retention

Title
Effect of pristine graphene incorporation on charge storage mechanism of three-dimensional graphene oxide: superior energy and power density retention
Authors
Singh, KP[Singh, Kiran Pal]Bhattacharjya, D[Bhattacharjya, Dhrubajyoti]Razmjooei, F[Razmjooei, Fatemeh]Yu, JS[Yu, Jong-Sung]
DGIST Authors
Singh, KP[Singh, Kiran Pal]; Bhattacharjya, D[Bhattacharjya, Dhrubajyoti]; Razmjooei, F[Razmjooei, Fatemeh]; Yu, JS[Yu, Jong-Sung]
Issue Date
2016-08-17
Citation
Scientific Reports, 6
Type
Article
Article Type
Article
ISSN
2045-2322
Abstract
In the race of gaining higher energy density, carbon's capacity to retain power density is generally lost due to defect incorporation and resistance increment in carbon electrode. Herein, a relationship between charge carrier density/charge movement and supercapacitance performance is established. For this purpose we have incorporated the most defect-free pristine graphene into defective/sacrificial graphene oxide. A unique co-solvent-based technique is applied to get a homogeneous suspension of single to bi-layer graphene and graphene oxide. This suspension is then transformed into a 3D composite structure of pristine graphene sheets (GSs) and defective N-doped reduced graphene oxide (N-RGO), which is the first stable and homogenous 3D composite between GS and RGO to the best of our knowledge. It is found that incorporation of pristine graphene can drastically decrease defect density and thus decrease relaxation time due to improved associations between electrons in GS and ions in electrolyte. Furthermore, N doping is implemented selectively only on RGO and such doping is shown to improve the charge carrier density of the composite, which eventually improves the energy density. After all, the novel 3D composite structure of N-RGO and GS greatly improves energy and power density even at high current density (20 A/g). © The Author(s) 2016.
URI
http://hdl.handle.net/20.500.11750/2211
DOI
10.1038/srep31555
Publisher
Nature Publishing Group
Related Researcher
  • Author Yu, Jong Sung Light, Salts and Water Research Group
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
Files:
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Collection:
ETC1. Journal Articles


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