Operating characteristics of aqueous magnetite electrochemical capacitors

Wang, S-Y.; Wu, N.-L.
March 2003
Journal of Applied Electrochemistry;Mar2003, Vol. 33 Issue 3/4, p345
Academic Journal
Operating characteristics, including capacitance, leakage current, operating potential range, cycling stability and open-circuit self-discharge behaviours, of the magnetite (Fe3O4) supercapacitor, containing 10 wt % carbon black as conductive additive, in aqueous electrolytes of Na2SO3, KOH and Na2SO4 were investigated. Although the capacitance of the oxide was found to depend heavily on electrolyte composition, the self-discharge mechanism in these electrolytes appeared to be the same. Reduction in the dissolved oxygen content (DOC) of the electrolyte reduced the leakage current and profoundly improved the cycling stability, in particular, Na2SO3(aq) gives the highest capacitance, nearly 30 F (g-Fe3O4)-1 or 80 µF cm-2 of actual surface area, with an operation range of 1.1 V based on a leakage current less than 0.1 mA F-1, and the electrode showed no deterioration after 104 cycles under a DOC < 0.1 ppm.


Related Articles

  • ??3 decomposition in a proton conducting solid electrolyte cell. Zisekas, S.; Karagiannakis, G.; Kokkofitis, C.; Stoukides, M. // Journal of Applied Electrochemistry;Aug2008, Vol. 38 Issue 8, p1143 

    The reaction of NH3 decomposition was studied on Ag in a proton conducting double chamber cell-reactor. The proton conductor was a strontia-ceria-ytterbia (SCY) perovskite of the form SrCe0.95Yb0.05O3-a. The reaction was studied at 350�700 �C and atmospheric total pressure. The proton...

  • Impedance Study of Electrochemical Stability Limits for Electrolytes. Dong Chen; Jie Cheng; Yuehua Wen; Gaoping Cao; Yusheng Yang; Hanmin Liu // International Journal of Electrochemical Science;Dec2012, Vol. 7 Issue 12, p12383 

    Aiming to accurately determine electrochemical stability for electrolytes with electrode of a high surface area in electrochemical capacitors, an impedance method is proposed based on the facts that the phase angle of the impedance curve will decrease as the frequency tends to zero as there...

  • Electrochemical deposition and characterization of Fe3O4 films produced by the reduction of Fe(III)-triethanolamine. Kothari, Hiten M.; Kulp, Elizabeth A.; Limmer, Steven J.; Poizot, Philippe; Bohannan, Eric W.; Switzer, Jay A. // Journal of Materials Research;Jan2006, Vol. 21 Issue 1, p293 

    In this paper, we demonstrate that films of magnetite, F3O4, can be deposited by the electrochemical reduction of a Fe(III)-triethanolamine complex in aqueous alkaline solution. The films were deposited with a columnar microstructure and a [100] preferred orientation on stainless steel...

  • Cover Picture: Corrosion Prevention Mechanism of Aluminum Metal in Superconcentrated Electrolytes (ChemElectroChem 11/2015). Yamada, Yuki; Chiang, Ching Hua; Sodeyama, Keitaro; Wang, Jianhui; Tateyama, Yoshitaka; Yamada, Atsuo // ChemElectroChem;Nov2015, Vol. 2 Issue 11, p1625 

    The cover page of the November 1, 2015 issue of "ChemElectroChem" is presented.

  • Corrosion Prevention Mechanism of Aluminum Metal in Superconcentrated Electrolytes. Yamada, Yuki; Chiang, Ching Hua; Sodeyama, Keitaro; Wang, Jianhui; Tateyama, Yoshitaka; Yamada, Atsuo // ChemElectroChem;Nov2015, Vol. 2 Issue 11, p1627 

    The front cover artwork is provided by Prof. Yamada's group at the University of Tokyo (Japan). The image shows an interface between a superconcentrated electrolyte and an aluminum current collector at a positive electrode in lithium-ion batteries. Read the full text of the Article at .

  • Electrochemical synthesis of perovskite oxides. Therese, G. Helen Annal; Dinamani, M.; Kamath, P. Vishnu // Journal of Applied Electrochemistry;May2005, Vol. 35 Issue 5, p459 

    Hydroxide precursors to perovskite oxides of the formula, LnMO3 (Ln = La, Pr, Nd; M = Al, Mn, Fe) and LaMO3 (M = Co and Ni) were synthesized by electrogeneration of base by cathodic reduction of the appropriate mixed-metal nitrate solution. The precursors were heat treated at different...

  • Manufacturers of electrolytic capacitors.  // Electronic Design;12/03/96 Supplement, Vol. 44 Issue 25, p24 

    Provides a list of electrolytic capacitor manufacturers in the United States which was originally published in the March 4, 1996 issue of `Electronic Design.'

  • Influence of BaO in perovskite electrodes for the electrochemical reduction of NO x . Simonsen, Vibe L. E.; Johnsen, Martin Moser; Hansen, Kent Kammer // Topics in Catalysis;Nov2007, Vol. 45 Issue 1-4, p131 

    Using the point electrode method, the effect of BaO on electrochemical reduction of NO x was investigated using the perovskites La0.85Sr0.15MnO3 (LSM15) and La0.85Sr0.15CoO3 (LSCo15) as electrode materials. The experiments were carried out in the temperature range 400–600 °C in 1% NO...

  • Optimize Electrolytic Capacitor Selection. Eliasson, Leif // Power Electronics Technology;Feb2003, Vol. 29 Issue 2, p34 

    Discusses applications operating with intermittent ripple current and the evaluation of thermal characteristics as a way for specifying a cost-effective, optimum electrolytic capacitor. Thermal model of a capacitor; Estimated capacitor life.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics