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Journal article
Flowable Conducting Particle Networks in Redox-Active Electrolytes for Grid Energy Storage
Journal of the Electrochemical Society, v 162(5), pp A5007-A5012
01 Jan 2015
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Abstract
This study reports a new hybrid approach toward achieving high volumetric energy and power densities in an electrochemical flow capacitor for grid energy storage. The electrochemical flow capacitor suffers from high self-discharge and low energy density because charge storage is limited to the available surface area (electric double layer charge storage). Here, we examine two carbon materials as conducting particles in a flow battery electrolyte containing the VO2+/VO2+ redox couple. Highly porous activated carbon spheres (CSs) and multi-walled carbon nanotubes (MWCNTs) are investigated as conducting particle networks that facilitate both faradaic and electric double layer charge storage. Charge storage contributions (electric double layer and faradaic) are distinguished for flow-electrodes composed of MWCNTs and activated CSs. A MWCNT flow-electrode based in a redox-active electrolyte containing the VO2+/VO2+ redox couple demonstrates 18% less self-discharge, 10 X more energy density, and 20 X greater power densities (at 20 mV s(-1)) than one based on a non-redox active electrolyte. Furthermore, a MWCNT redox-active flow electrode demonstrates 80% capacitance retention, and >95% coulombic efficiency over 100 cycles, indicating the feasibility of utilizing conducting networks with redox chemistries for grid energy storage. (C) The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. All rights reserved.
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Details
- Title
- Flowable Conducting Particle Networks in Redox-Active Electrolytes for Grid Energy Storage
- Creators
- K. B. Hatzell - Drexel UniversityM. Boota - Drexel UniversityE. C. Kurnbur - Drexel Univ, Dept Mech Engn & Mech, Electrochem Energy Syst Lab, Philadelphia, PA 19104 USAY. Gogotsi - Drexel UniversityOak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Details
- Journal of the Electrochemical Society, v 162(5), pp A5007-A5012
- Publisher
- Electrochemical Soc Inc
- Number of pages
- 6
- Grant note
- Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE) 1351161 / Div Of Chem, Bioeng, Env, & Transp Sys; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) 1002809 / NSF; National Science Foundation (NSF) 1351161 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000351976200003
- Scopus ID
- 2-s2.0-84924062437
- Other Identifier
- 991019167599204721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Electrochemistry
- Materials Science, Coatings & Films