<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>i used galvanized carbon / graphite ..</DIV>
<DIV> </DIV>
<DIV>good old carbon paper might work but is difficult to get ... </DIV>
<DIV> </DIV>
<DIV>graphite works excellently .... and graphite powder can be obtained "cheaply" </DIV>
<DIV>(can be used to make conductive ink ) ... </DIV>
<DIV>[ try to get the middle of a pencil ( that's pure graphite) ] </DIV>
<DIV>use a handkerchief , toilet paper or something else for the electrolyte </DIV>
<DIV> </DIV>
<DIV>anyway used alu foil you can get easily from everywhere </DIV>
<DIV>===</DIV>
<DIV>for the volts you can use either "joule thief" or one of those special ICs ... </DIV></td></tr></table><br>