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Electrolyte-less Capacitor

Discussion in 'General Electronics Discussion' started by seza, Nov 10, 2019.

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  1. seza


    Nov 6, 2015
    Hi all,

    Having two parallel conductive plates with a separator inbetween with NO electrolyte whatsoever, can they function as a capacitor? if so how about voltage?

  2. duke37


    Jan 9, 2011
    Most capacitors do not have an electrolyte. Most have a dielectric, this may be vacuum, air, plastic or aluminium oxide in electrolytic capacitors.
    Voltage is limited by the breakdown of the dielectric. Vacuum is best, modern plastics are very good and the dielectic constant is much higher than one so the capacitor can be much smaller.
    hevans1944 and davenn like this.
  3. bertus

    bertus Moderator

    Nov 8, 2019

    The following site will tell a lot about capacitors:
    On the menu on the left, you can select the topics.

  4. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    The electrolyte is not what makes the capacitor. It is the very thin aluminium oxide interface layer separating the electrodes which creates the capacitance of an electrolytic capacitor. The electrolyte is conductive and serves to maximize the contact to the rough surface of the aluminium electrode. More details you'll find at the website linked to by @bertus ' excellent link.
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