Well in a roundabout way you do still need worry about current reversal.
Alternating polarity provides even wear on both electrodes rather than just
pulling silver off one all the time.
And whatever microscopic crud which may be left from previous brewing will be
repelled off that other electrode {not being a chemistry geek, that's the best
explanation I can give}.
N.
> From: [email protected]
> To: [email protected]
> Subject: Re: CS>Does the cathode need to be silver?
> Date: Wed, 8 Sep 2010 19:40:53 -0400
>
> The cathode is the source of the current flow.
> You want the source to be silver.
>
> If you have ANY confusion, use silver for both the cathode AND the
> anode.
> Actually you won't have to worry about current reversal, then.
>
>
> Chuck
> 43% of all statistics are worthless.
>
> On 9/8/2010 6:28:36 PM, David AuBuchon ([email protected])
> wrote:
> > Is there any reason everyone uses silver for the cathode? I can
> > understand if people were reversing the polarity. But when things only go
> > one way, does it matter what the cathode is made of? Could it just be
> > copper wire?
> >
> > Also,
> > isn't the surface area of the cathode important. With the anode, more
> > surface area reduces the density of a layer of silver ions coming off,
> > combining with hydroxide ions. At the cathode end, isn't
> > there a dense layer of hydroxide combining with incoming silver ions?
> >
> > Thanks,
> > ~David
>
>
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