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Title: Towards High-Energy-Density Pseudocapacitive Flowable Electrodes by the Incorporation of Hydroquinone

Abstract

Our study reports an investigation of hydroquinone (HQ) as a multielectron organic redox molecule to enhance the performance of flowable electrodes. Moreover, two different methods to produce high-performance pseudocapacitive flowable electrodes were investigated for electrochemical flow capacitors. First, HQ molecules were deposited on carbon spheres (CSs) by a self-assembly approach using various HQ loadings. In the second approach, HQ was used as a redox-mediating agent in the electrolyte. Flowable electrodes composed of HQ showed a capacitance of 342 Fg 1, which is >200% higher than that of flowable electrodes based on nontreated CSs (160 Fg 1), and outperformed (in gravimetric performance) many reported film electrodes. A similar trend in capacitance was observed if HQ was used as a redox agent in the electrolyte; however, its poor cycle life restricted further consideration. Additionally, a twofold increase in capacitance was observed under flow conditions compared to that of previous studies.

Authors:
 [1];  [1];  [1];  [1]
  1. Drexel Univ., Philadelphia, PA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1265865
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Boota, M., Hatzell, K. B., Kumbur, E. C., and Gogotsi, Y.. Towards High-Energy-Density Pseudocapacitive Flowable Electrodes by the Incorporation of Hydroquinone. United States: N. p., 2015. Web. doi:10.1002/cssc.201402985.
Boota, M., Hatzell, K. B., Kumbur, E. C., & Gogotsi, Y.. Towards High-Energy-Density Pseudocapacitive Flowable Electrodes by the Incorporation of Hydroquinone. United States. doi:10.1002/cssc.201402985.
Boota, M., Hatzell, K. B., Kumbur, E. C., and Gogotsi, Y.. Thu . "Towards High-Energy-Density Pseudocapacitive Flowable Electrodes by the Incorporation of Hydroquinone". United States. doi:10.1002/cssc.201402985. https://www.osti.gov/servlets/purl/1265865.
@article{osti_1265865,
title = {Towards High-Energy-Density Pseudocapacitive Flowable Electrodes by the Incorporation of Hydroquinone},
author = {Boota, M. and Hatzell, K. B. and Kumbur, E. C. and Gogotsi, Y.},
abstractNote = {Our study reports an investigation of hydroquinone (HQ) as a multielectron organic redox molecule to enhance the performance of flowable electrodes. Moreover, two different methods to produce high-performance pseudocapacitive flowable electrodes were investigated for electrochemical flow capacitors. First, HQ molecules were deposited on carbon spheres (CSs) by a self-assembly approach using various HQ loadings. In the second approach, HQ was used as a redox-mediating agent in the electrolyte. Flowable electrodes composed of HQ showed a capacitance of 342 Fg 1, which is >200% higher than that of flowable electrodes based on nontreated CSs (160 Fg 1), and outperformed (in gravimetric performance) many reported film electrodes. A similar trend in capacitance was observed if HQ was used as a redox agent in the electrolyte; however, its poor cycle life restricted further consideration. Additionally, a twofold increase in capacitance was observed under flow conditions compared to that of previous studies.},
doi = {10.1002/cssc.201402985},
journal = {ChemSusChem},
number = 5,
volume = 8,
place = {United States},
year = {Thu Jan 29 00:00:00 EST 2015},
month = {Thu Jan 29 00:00:00 EST 2015}
}

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