In the present paper, a composite electrode material was developed for vanadium redox flow batteries (VRFBs). Activated charcoal particles were evenly immobilized on the graphite felt (GF) via a sucrose pyrolysis process for the first time. The in site formed pyrolytic carbon is used as the binder, because it is essentially carbon material as well as GF and activated charcoal, which has a natural tendency to realize good adhesion and low contact resistance. The activated charcoal decorated GF electrode (abbreviated as the composite electrode) possesses larger surface area (13.8 m2 g−1), more than two times as GF (6.3 m2 g−1). The oxygen content of composite electrode is also higher (7.0%) than that of GF (4.8%). The composite electrode was demonstrated to lower polarization and increase the reversibility toward the VO2+/VO2+ redox couple according to the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements. The charge–discharge cycling test was conducted with a single VRFB cell. The results indicate that the cell with composite electrode presents higher charge–discharge capacity, larger electrolyte utilization efficiency (EU), and higher energy conversion efficiency (79.1%) compared with that using GF electrode. The increasing electrochemical performances of composite electrodes are mainly ascribed to the high electrochemical activity of activated charcoal particles and increasing superficial area.
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November 2017
Research-Article
Activated Charcoal Modified Graphite Felts Using for Positive Electrodes of Vanadium Redox Flow Battery
Haitao Yang
,
Haitao Yang
State Key Laboratory of Multiphase
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
Search for other works by this author on:
Chuanlin Fan
,
Chuanlin Fan
State Key Laboratory of Multiphase
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: chlfan@ipe.ac.cn
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: chlfan@ipe.ac.cn
Search for other works by this author on:
Qingshan Zhu
Qingshan Zhu
State Key Laboratory of Multiphase
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China;
University of Chinese Academy of Sciences,
Beijing 100049, China
e-mail: qszhu@ipe.ac.cn
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China;
University of Chinese Academy of Sciences,
Beijing 100049, China
e-mail: qszhu@ipe.ac.cn
Search for other works by this author on:
Haitao Yang
State Key Laboratory of Multiphase
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
Chuanlin Fan
State Key Laboratory of Multiphase
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: chlfan@ipe.ac.cn
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: chlfan@ipe.ac.cn
Qingshan Zhu
State Key Laboratory of Multiphase
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China;
University of Chinese Academy of Sciences,
Beijing 100049, China
e-mail: qszhu@ipe.ac.cn
Complex Systems,
Institute of Process Engineering,
Chinese Academy of Sciences,
Beijing 100190, China;
University of Chinese Academy of Sciences,
Beijing 100049, China
e-mail: qszhu@ipe.ac.cn
Manuscript received May 31, 2017; final manuscript received July 31, 2017; published online August 29, 2017. Assoc. Editor: Dirk Henkensmeier.
1Corresponding authors.
J. Electrochem. En. Conv. Stor. Nov 2017, 14(4): 041004 (6 pages)
Published Online: August 29, 2017
Article history
Received:
May 31, 2017
Revised:
July 31, 2017
Citation
Yang, H., Fan, C., and Zhu, Q. (August 29, 2017). "Activated Charcoal Modified Graphite Felts Using for Positive Electrodes of Vanadium Redox Flow Battery." ASME. J. Electrochem. En. Conv. Stor. November 2017; 14(4): 041004. https://doi.org/10.1115/1.4037532
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