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
Facilitated Ion Transport in All-Solid-State Flexible Supercapacitors
TL;DR: This research provides new insight into the rational design and fabrication of all-solid-state flexible energy-storage devices as well as the fundamental understanding of ion and charge transport at the interface.
Journal ArticleDOI
Thin Film Fabrication and Simultaneous Anodic Reduction of Deposited Graphene Oxide Platelets by Electrophoretic Deposition
Sung Jin An,Yanwu Zhu,Sun Hwa Lee,Meryl D. Stoller,T. Emilsson,Sungjin Park,Aruna Velamakanni,Jinho An,Rodney S. Ruoff +8 more
TL;DR: In this article, the deposition of films composed of overlapped and stacked platelets of graphene oxide (G-O) reduced by an electrophoretic deposition (EPD) process was reported.
Journal ArticleDOI
Single-layer graphene nanosheets with controlled grafting of polymer chains
TL;DR: In this article, a single-layer graphene nanosheets (SLGNs) are prepared by reduction of well-exfoliated graphite oxide aided by a surfactant (sodium dodecylbenzene sulfonate, SDBS) by modulating the concentrations of diazonium compound and monomer during the grafting reaction of the initiator and the succeeding atomic transfer radical polymerization (ATRP).
Journal ArticleDOI
Green preparation of reduced graphene oxide for sensing and energy storage applications
TL;DR: The CA-reduced GO (CA-rGO) showed a high C/O ratio (715) that is among the best rGOs prepared with green reducing reagents as discussed by the authors.
Journal ArticleDOI
Three-dimensional self-assembly of graphene oxide platelets into mechanically flexible macroporous carbon films.
Sun Hwa Lee,Hyun Wook Kim,Jin Ok Hwang,Won Jun Lee,Joon Kwon,Christopher W. Bielawski,Rodney S. Ruoff,Sang Ouk Kim +7 more
TL;DR: The self-assembly of chemically modified graphene platelets into a complex 3D morphology was achieved by the “breath-figure” method, which is a straightforward procedure for synthesizing large-area porous polymer films.
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.