Pulse Anodization of Tantalum Oxide/Polypyrrole Film on Nanoporous Tantalum Anode for Solid Electrolytic Capacitors

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  • NAOI Katsuhiko
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • OTA Yosuke
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • MACHIDA Kenji
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology

Bibliographic Information

Other Title
  • ナノポーラスタンタル陽極上での酸化タンタル/ポリピロール膜のパルス電解同時生成と電解キャパシタ
  • ナノポーラスタンタル ヨウキョク ジョウ デ ノ サンカ タンタル ポリピロール マク ノ パルス デンカイ ドウジ セイセイ ト デンカイ キャパシタ

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Abstract

<p>Under a pulse anodization mode, a dielectric Ta2O5 film and a conducting polypyrrole film were formed on a nanoporous Ta pellet anode (average pore size: 250 nm, specific surface area: 4,000 cm2 g－1, capacitance: 50,000μFV g－1). At a first pulse, Ta metal was anodized to form dielectric Ta2O5 nano film (1.6~ 14 nm in thickness) on nano-porous Ta pellet. With subsequent pulses, the polypyrrole film was deposited uniformly and compactly (average thickness: 70~230 nm) on the Ta2O5/Ta nano-porous layer. The thickness of polypyrrole film was controlled by tuning current and charge of the pulse. The polypyrrole film on the Ta2O5/Ta nano-porous layer showed low resistivity of 2×10－1Ω persquare. By AC impedance analysis, low equivalent series resistance (400 mΩ at 100 kHz) was demonstrated for a sample electrolytic capacitor with nano-porous Ta2O5/Ta anode with polypyrrole coating layer.</p>

Journal

  • Electrochemistry

    Electrochemistry 73 (7), 496-501, 2005-07-05

    The Electrochemical Society of Japan

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