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Author Topic: Polished electrodes  (Read 2911 times)

Offline Artic_Knight

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Polished electrodes
« on: January 29, 2010, 05:38:16 AM »
Polished vs non-polished has anyone compared?

on a polished surface there is less surface area but its closer to perfectly flat (microscopically) and fewer or no bubbles are on the surface increasing electrical contact.

on a rough surface there is more surface area but the pits and scratches create "pockets" to hold air and reduce water contact.

so has anyone compared?

Offline Artic_Knight

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Re: Polished electrodes
« Reply #1 on: January 29, 2010, 07:53:56 PM »
heres another way to look at it, the golf ball is dimpled because fluid dynamics show that the dimples create pockets of air. these pockets create a lubricating effect reducing friction. thats because air stays in these dimples and doesnt touch the plastic case of the ball.

translate that to electrodes, if its rough there will be a place or pocket for air to remain trapped thus blocking water from making contact with the electrode, no contact no production. a mirror finish does reduce surface area but it reduces pockets.

if a pocket is visualized as a U shape then you can see how polishing the surface would reduce by a factor of 50% but considering that the pocket looks like 0 because air is trapped and water cannot get in you actually gain 25% surface area in the real world.

better to gain some then lose all right?

i think by mirroring the plates it will increase current draw atleast for the same given electrolyte.