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Title: Graphene-containing flowable electrodes for capacitive energy storage

Journal Article · · Carbon

High conductivity and extended particle contacts are required for rapid charge percolation in flowable electrodes. In this study, carbon spheres (CS) were wrapped by highly conductive reduced graphene oxide sheets (rGO) to address these issues. We synthesized various compositions of the conductive, 3D interconnected hybrid materials (rGO@CS) using the hydrothermal method. Synergistic effects of both materials were utilized where CS served to minimize the sheet stacking for better flowability of the suspensions, and wrapped rGO sheets enabled higher conductivity for fast charge transport throughout the suspension network. When we tested as flowable electrodes, the composition with a 1:2 ratio of GO to CS exhibited the highest capacitance of 200 F/g and an improved rate performance. Moreover, the improved performance is attributed to the fast charge transport in the suspension network due to higher conductivity and enhanced connectivity of the active material particles. Optimized electrodes were also examined in a flow mode which yielded a capacitance of 45 F/g.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; ERKCC61; 1351161; 1002809
OSTI ID:
1265864
Alternate ID(s):
OSTI ID: 1355801
Journal Information:
Carbon, Vol. 92, Issue C; ISSN 0008-6223
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 89 works
Citation information provided by
Web of Science

References (30)

A metal-free organic–inorganic aqueous flow battery journal January 2014
The Electrochemical Flow Capacitor: A New Concept for Rapid Energy Storage and Recovery journal May 2012
Semi-Solid Lithium Rechargeable Flow Battery journal May 2011
Composite Manganese Oxide Percolating Networks As a Suspension Electrode for an Asymmetric Flow Capacitor journal May 2014
Effects of flow cell design on charge percolation and storage in the carbon slurry electrodes of electrochemical flow capacitors journal February 2014
Recent Progress in Redox Flow Battery Research and Development journal September 2012
An All-Organic Non-aqueous Lithium-Ion Redox Flow Battery journal June 2012
Reversible chemical delithiation/lithiation of LiFePO4 : towards a redox flow lithium-ion battery journal December 2013
The effect of graphene on the performance of an electrochemical flow capacitor journal January 2015
Continuous operation of an electrochemical flow capacitor journal November 2014
Investigation of carbon materials for use as a flowable electrode in electrochemical flow capacitors journal May 2013
A high performance pseudocapacitive suspension electrode for the electrochemical flow capacitor journal November 2013
Activated Carbon Spheres as a Flowable Electrode in Electrochemical Flow Capacitors journal January 2014
Highly porous carbon spheres for electrochemical capacitors and capacitive flowable suspension electrodes journal October 2014
Flowable Conducting Particle Networks in Redox-Active Electrolytes for Grid Energy Storage journal January 2015
Effect of Oxidation of Carbon Material on Suspension Electrodes for Flow Electrode Capacitive Deionization journal February 2015
Towards High-Energy-Density Pseudocapacitive Flowable Electrodes by the Incorporation of Hydroquinone journal January 2015
Intercalation of mesoporous carbon spheres between reduced graphene oxide sheets for preparing high-rate supercapacitor electrodes journal January 2011
Nanoarchitectured Graphene/CNT@Porous Carbon with Extraordinary Electrical Conductivity and Interconnected Micro/Mesopores for Lithium-Sulfur Batteries journal January 2014
Mechanically Robust, Electrically Conductive Biocomposite Films Using Antimicrobial Chitosan-Functionalized Graphenes journal June 2013
Click coupled graphene for fabrication of high-performance polymer nanocomposites journal August 2012
Graphene-Based Ultracapacitors journal October 2008
Electrochemical synthesis of poly(3,4-ethylenedioxythiophene) in aqueous dispersion of high porosity reduced graphene oxide journal January 2014
Maximizing Energetic Efficiency in Flow Batteries Utilizing Non-Newtonian Fluids journal January 2014
Structure of carbon produced by hydrothermal treatment of β-SiC powder journal January 1996
Decomposition of silicon carbide in the presence of organic compounds under hydrothermal conditions journal September 2001
High performance supercapacitors based on reduced graphene oxide in aqueous and ionic liquid electrolytes journal February 2011
Water Desalination Using Capacitive Deionization with Microporous Carbon Electrodes journal February 2012
Capacitive deionization concept based on suspension electrodes without ion exchange membranes journal June 2014
Using Flow Electrodes in Multiple Reactors in Series for Continuous Energy Generation from Capacitive Mixing journal November 2014