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The Electrochemical Flow Capacitor: A New Concept for Rapid Energy Storage and Recovery

  1. Volker Presser1,
  2. Christopher R. Dennison2,
  3. Jonathan Campos1,
  4. Kevin W. Knehr2,
  5. Emin C. Kumbur2,*,
  6. Yury Gogotsi1,*

Article first published online: 23 MAY 2012

DOI: 10.1002/aenm.201100768

Issue

Advanced Energy Materials

Advanced Energy Materials

Special Issue: Battery Materials

Volume 2, Issue 7, pages 895–902, July, 2012

Additional Information

How to Cite

Presser, V., Dennison, C. R., Campos, J., Knehr, K. W., Kumbur, E. C. and Gogotsi, Y. (2012), The Electrochemical Flow Capacitor: A New Concept for Rapid Energy Storage and Recovery. Adv. Energy Mater., 2: 895–902. doi: 10.1002/aenm.201100768

Author Information

  1. 1

    A. J. Drexel Nanotechnology Institute, Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA

  2. 2

    Electrochemical Energy Systems Laboratory, Department of Mechanical Engineering, Drexel University, Philadelphia, PA 19104, USA

*Electrochemical Energy Systems Laboratory, Department of Mechanical Engineering, Drexel University, Philadelphia, PA 19104, USA

Publication History

  1. Issue published online: 11 JUL 2012
  2. Article first published online: 23 MAY 2012
  3. Manuscript Revised: 7 MAR 2012
  4. Manuscript Received: 20 DEC 2011

Funded by

  • US Department of Energy, Office of Science, Office of Basic Energy Sciences. Grant Number: ERKCC61
  • NSF IGERT. Grant Number: DGE-0654313
  • NSF REU. Grant Number: 235638
  • Southern Pennsylvania Ben Franklin Energy Commercialization Institute. Grant Number: 001389-002
  • US National Science Foundation Bridge to the Doctorate Fellowship. Grant Number: 1026641

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Keywords:

  • supercapacitors;
  • electrochemical energy storage;
  • grid energy storage;
  • flow cells

Abstract

Availability of grid-scale electric energy storage systems with response rates on the order of seconds plays a key role in wide implementation of renewable energy sources. Here, a new concept called the electrochemical flow capacitor (EFC) is presented. This new concept shares the major advantages of both supercapacitors and flow batteries, providing rapid charging/discharging while enabling the decoupling of the power and energy ratings. Like in supercapacitors, energy is stored in the electric double layer of charged carbon particles. A flowable carbon-electrolyte mixture is employed as the active material for capacitive energy storage, and is handled in a similar fashion to flow or semi-solid batteries (i.e., for charging/discharging, it is pumped into an electrochemical cell, and for storage, it is pumped into reservoirs). This study presents the proof-of-concept of this technology and reports initial EFC performance data obtained under static and intermittent flow operations.

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