Journal ArticleDOI
Graphene-Based Ultracapacitors
TLDR
CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here their performance in an ultracapacitor cell is demonstrated, illustrating the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.Abstract:
The surface area of a single graphene sheet is 2630 m2/g, substantially higher than values derived from BET surface area measurements of activated carbons used in current electrochemical double layer capacitors. Our group has pioneered a new carbon material that we call chemically modified graphene (CMG). CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here we demonstrate in an ultracapacitor cell their performance. Specific capacitances of 135 and 99 F/g in aqueous and organic electrolytes, respectively, have been measured. In addition, high electrical conductivity gives these materials consistently good performance over a wide range of voltage scan rates. These encouraging results illustrate the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.read more
Citations
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Journal ArticleDOI
Magnetic Fe3O4-graphene oxide/polystyrene: Fabrication and characterization of a promising nanocomposite
TL;DR: In this paper, a novel magnetic composite of graphene oxide and polystyrene (NanoFe 3 O 4 @GO/PS) was fabricated through two steps, i.e., a simple and effective one-pot co-precipitation of iron (II) and chlorides, in the presence of the graphene oxide (GO), resulted in the fabrication of the magnetite-GO hybrid-nanoparticles.
Journal ArticleDOI
Application of carbon materials in redox flow batteries
M.H. Chakrabarti,M.H. Chakrabarti,Nigel P. Brandon,S.A. Hajimolana,Farid Tariq,Vladimir Yufit,Mohd Ali Hashim,Mohd Azlan Hussain,Chee Tong John Low,P.V. Aravind +9 more
TL;DR: In this article, a comprehensive discussion is provided on the advances made using nanotechnology and it is envisaged that if this is combined with ionic liquid technology, major advantages could be realised.
Journal ArticleDOI
Adsorption of aromatic organic contaminants by graphene nanosheets: comparison with carbon nanotubes and activated carbon.
TL;DR: Graphenes can serve as alternative adsorbents for removing SOCs from water, however, they will also, if released to environment, adsorb organic contaminants influencing their fate and impact in the environment.
Journal ArticleDOI
Porous NiCo2O4 spheres tuned through carbon quantum dots utilised as advanced materials for an asymmetric supercapacitor
Yirong Zhu,Zhibin Wu,Mingjun Jing,Hongshuai Hou,Yingchang Yang,Yan Zhang,Xuming Yang,Weixin Song,Xinnan Jia,Xiaobo Ji +9 more
TL;DR: In this article, carbon quantum dots (CQDs) tuned porous NiCo2O4 sphere composites are prepared for the first time via a reflux synthesis route followed by a post annealing treatment.
Journal ArticleDOI
Hierarchically aminated graphene honeycombs for electrochemical capacitive energy storage
Chenmeng Chen,Chenmeng Chen,Chenmeng Chen,Qiang Zhang,Qiang Zhang,Xiaochen Zhao,Xiaochen Zhao,Bingsen Zhang,Qingqiang Kong,Mang-Guo Yang,Quang-Hong Yang,Mao-Zhang Wang,Yong-gang Yang,Robert Schlögl,Dang Sheng Su,Dang Sheng Su +15 more
TL;DR: In this article, the hierarchical aminated graphitic honeycombs (AGHs) with large surface area for electrical double layer capacitance, tunable surface chemistry for pseudo-capacitance, mediated 3D macropores for ion buffering, and low-resistant pathways for ion diffusion are fabricated for electrochemical capacitive energy storage application through a facile high vacuum promoted thermal expansion and subsequent amination process.
References
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Journal ArticleDOI
Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
Sasha Stankovich,Dmitriy A. Dikin,Richard D. Piner,Kevin A. Kohlhaas,Alfred Kleinhammes,Yuanyuan Jia,Yue Wu,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.
Journal ArticleDOI
Graphene-based composite materials
Sasha Stankovich,Dmitriy A. Dikin,Geoffrey Dommett,K. Kohlhaas,Eric Zimney,Eric A. Stach,Richard D. Piner,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.
Journal ArticleDOI
Processable aqueous dispersions of graphene nanosheets
TL;DR: It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
Journal ArticleDOI
Preparation and Characterization of Graphene Oxide Paper
Dmitriy A. Dikin,Sasha Stankovich,Eric Zimney,Richard D. Piner,Geoffrey Dommett,Guennadi Evmenenko,SonBinh T. Nguyen,Rodney S. Ruoff +7 more
TL;DR: Graphene oxide paper is reported, a free-standing carbon-based membrane material made by flow-directed assembly of individual graphene oxide sheets that outperforms many other paper-like materials in stiffness and strength.
Book
Electrochemical Supercapacitors : Scientific Fundamentals and Technological Applications
TL;DR: In this paper, the double-layer and surface functionalities at Carbon were investigated and the double layer at Capacitor Electrode Interfaces: its structure and Capacitance.