• Title/Summary/Keyword: Aluminum powder disk electrode

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Fabrication of Aluminum Powder Disk by a Template Method and Its Etching Condition for an Electrode of Hybrid Supercapacitor (Template 방법을 이용한 Hybrid Supercapacitor 전극용 알루미늄 분말 디스크 제조와 에칭 조건 연구)

  • Jin, Chang-Soo;Lee, Yong-Sung;Shin, Kyung-Hee;Kim, Jong-Huy;Yoon, Soon-Gil
    • Journal of the Korean Electrochemical Society
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    • v.6 no.2
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    • pp.145-152
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    • 2003
  • Capacitance of a hybrid capacitor that has characteristics of both electrolyte capacitor and supercapacitor is determined by anode surface covered with oxide layer. In this study, optimal condition processes for anode to fabricate a high voltage hybrid capacitor was investigated. We mixed aluminum powder having mean particle size of $40{\mu}m$ with NaCl powders at weight ratio of 4 : 1 and prepared a disk type electrode after annealing at various temperature. After dissolving NaCl in $50^{\circ}C$ distilled water, heat treatment, eletropolishing, chemical treatment, and the first and the second etching of Al disk were conducted. In each process, capacitances and resistances of the disk measured by ac-impedance analyzer were compared to find its optimum treatment condition. Also, the surface morphology of treated disks were observed and compared by SEM. After the second etching, the Al disk was anodized at 365V to make an anode of hybrid supercapacitor that can be operated at 300V, Capacitance and resistance of the anodized Al disk electrode was compared with those of commercialized conventional aluminum electrolytic capacitor at different frequencies.