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Electrochemistry : characterizing the electrode-electrolyte

  1. Aug 24, 2016 #1
    Hello guys (and gals),

    I have mostly a background in Physics, but I've recently had to get some knowledge on electrochemistry, and more precisely on electrode-electrolyte interface.

    From "Modern Electrochemistry 2A : Fundamentals of Electrodics" by Bockris I gathered that in the case of a metallic electrode plunged in an aqueous solution (with ultradilute concentration of inorganic ions) with a DC current, I can pretty much model it with a resistance and capacitor in parallel as an equivalent electrical circuit with the resistor being the interfacial resistance and the capacitor being the EDL capacitance.

    From what I gathered, the capacitance of the EDL of a metallic electrode is generally estimated to be around 20µF/cm² in solutions with millimolar to molar concentration of ions with AC current. Can I safely take this value (or this order of magnitude) for my electrode in deionized water and DC or am I missing an important parameter that can change everything ?

    Hope I'm making sense :p
    Cheers !
     
  2. jcsd
  3. Aug 24, 2016 #2

    Bystander

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    μF or pF/cm2?
     
  4. Aug 24, 2016 #3
    µF/cm² for differential capacitance at least
     
    Last edited: Aug 24, 2016
  5. Aug 24, 2016 #4

    Bystander

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    ??!!
     
  6. Aug 24, 2016 #5
    Yes, I'm working on streaming current and on the data with deionized water as fluid
     
  7. Aug 24, 2016 #6

    Borek

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    EDL involves ions and water dipoles, no ions, much less pronounced EDL.

    At least that would be my line of thinking.
     
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