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
Three-Dimensional Printed Electrode and Its Novel Applications in Electronic Devices
TL;DR: By subsequently modifying the printing material and electrode architecture, this 3D printing approach could provide a facile and rapid manufacturing process for energy devices based on the conceptual design.
Journal ArticleDOI
One-step fabrication and capacitive behavior of electrochemical double layer capacitor electrodes using vertically-oriented graphene directly grown on metal
TL;DR: In this article, a one-step binder-free fabrication method for electrochemical double layer (EDL) capacitor electrodes consisting of vertically-oriented graphene uniformly grown on a metallic current collector is reported.
Journal ArticleDOI
Fabrication of free-standing hierarchical carbon nanofiber/graphene oxide/polyaniline films for supercapacitors
TL;DR: The morphology analysis shows that introducing one-dimensional CNF could significantly decrease/inhibit the staking of laminated GO to form an open-porous CNF/GO architecture and the electrochemical properties of the hierarchical structure can be further improved by a reduction procedure of GO before the deposition of PANI.
Journal ArticleDOI
Fabrication of Electrochemically Reduced Graphene Oxide Films on Glassy Carbon Electrode by Self-Assembly Method and Their Electrocatalytic Application
M. Amal Raj,S. Abraham John +1 more
TL;DR: In this article, a simple, facile and reproducible method for the fabrication of electrochemically reduced graphene oxide (ERGO) films on glassy carbon electrode (GCE) by the self-assembly method was reported.
Journal ArticleDOI
Graphene quantum dots–three-dimensional graphene composites for high-performance supercapacitors
TL;DR: Owing to the convenience of the current method, it can be further used in other well-defined electrode materials, such as carbon nanotubes, carbon aerogels and conjugated polymers to improve the performance of the supercapacitors.
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.