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Characterization of tantalum oxide-ruthenium oxide hybrid capacitors

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5 Author(s)
Tzu-Yen Chang ; Dept. of Electr. & Comput. Eng., Florida A&M Univ., Tallahassee, FL, USA ; Xu Wang ; Evans, D.A. ; Roberson, S.L.
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The ac and dc performance and leakage current of Evans tantalum oxide-ruthenium oxide hybrid capacitors were characterized at room temperature. The RC time constants were in the range from 2 to 0.45 ms and dependent on the maximum operational voltage of the capacitor. The gravimetric and volumetric energy densities of hybrid capacitors were in the range of 0.074-0.233 J/g and 0.388-1.384 J/cm3, respectively. The gravimetric and volumetric power densities of hybrid capacitors were in the range of 19-259 W/g and 100-1540 W/cm3, respectively. A comparison of the performance between hybrid capacitors to conventional aluminum and tantalum electrolytic capacitors is made in this paper.

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Industrial Electronics, IEEE Transactions on  (Volume:51 ,  Issue: 6 )