• 제목/요약/키워드: Electrochemical Characterization

검색결과 419건 처리시간 0.025초

K2CO3 처리된 Coal Tar Pitch 활성탄 전극의 결정성 및 EDLC 성능 (Structural Characterization and EDLC-Electrode Performance of Coal-Tar-Pitch Activated Carbon Using K2CO3 Treatment)

  • 최푸름;정지철;임연수;김명수
    • 한국재료학회지
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    • 제26권9호
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    • pp.460-467
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    • 2016
  • Activated carbons (ACs) have been used as EDLC (electric double-layer capacitor) electrode materials due to their high specific area, stability, and ecological advantages. In order to prepare ACs with high density and crystallinity, coal tar pitch (CTP) was activated by $K_2CO_3$ and the textural and electrochemical properties of the obtained ACs were investigated. Although the CTP ACs formed by $K_2CO_3$ activation had much smaller specific surface area and pore volume than did the CTP ACs formed by KOH activation, their volumetric specific capacitance (F/cc) levels as electrode materials for EDLC were comparable due to their higher density and micro-crystallinity. Structural characterization and EDLC-electrode performance were studied with different activation conditions of $CTP/K_2CO_3$ ratio, activation temperature, and activation period.

전기화학적 활성과 내구성이 높은 Ti/IrO2/Ta2O5 전극 제조 (Fabrication of Ti/IrO2/Ta2O5 Electrode with High Electrochemical Activity and Long Lifetime)

  • 김다은;유재민;이용호;박대원
    • 한국물환경학회지
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    • 제33권1호
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    • pp.34-39
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    • 2017
  • Under a corrosive environment, electrodes that are applied in the water-treatment system need not only very high electrochemical activity for fast reactions, but also high durability for cost saving. Therefore, the fabrication condition of iridium electrodes was examined to produce a more durable iridium electrode in this study. Tantalum was selected as a binder to enhance the durability of the iridium electrode. Investigation of the weight ratio between the catalyst and the binder to improve electrochemical activity was performed. Also, to compare the effect of the different coating amounts of the catalyst, the results of CV (Cyclic Voltammetry) and EIS (Electrochemical Impedance Spectroscopy) were discussed. Furthermore, an ALT(Accelerated Lifetime Test) was designed and applied to the electrodes to determine the conditions for highly durable electrode fabrication.

Corrosion in Batteries

  • Muniyandi, N.
    • Corrosion Science and Technology
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    • 제2권1호
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    • pp.1-6
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    • 2003
  • A comprehensive coverage of corrosion in batteries is rendered difficult by the wide choice of materials, environments and physical features as obtained in practical settings. Understanding of the complex processes that occur in these electrochemical systems gets clearer as new theoretical approaches backed by sophisticated analytical and characterization techniques continue to provide valuable insights which aid in controlling/mitigating wasteful corrosion reactions which affect battery shelf-life, cycle life, rate capability and capacity. In the light of the above, I limit myself to a discussion on corrosion aspects in representative system such as conventional Leclanche, lead-acid battery and magnesium batteries, and advanced lithium systems.