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hashashan
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the density is not too high
about 300ma/cm^2
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Xenoid
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Well I think that is very high!
I don't even run Pt that high, but I'm pretty conservative on this aspect!
None of my homemade "oxide" based anodes seems particularly stable above 100mA/cm^2. I would suggest you lower the current density by at least half,
see what happens!
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chloric1
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hashashan- You may have to run slightly below 100mA/cm2 given what dann2 experienced in trying his DTO anode. Apparenty the lithium chloride is more
erosive towards anodes than its sodium counterpart.
In the theater of life its nice to know where the exit doors are located.
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hashashan
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Well lowered it to about 150ma/cm2 ..... Ill lower it to 100 just in case and let it run for a day
I don't know ... I usually run the PbO2 at 300-500 with NaCl and there is only slight erosion ... not too much about half a gram per 350g of NaCl
But with the LiCl I got a really brown solution in only half an hour ... I never saw that dark solution with the NaCl .. not even after a week at
400ma/cm2
Anyone tried Barium Chloride?
Update:
Setting it to 150mA/cm2 helped a lot.
after 12 hours there is some erosion but not as near as it was at 300mA/cm.
I would go down to 100mA/cm2 but it will take for ever to finishe the process.
It will take 20 days only for the chlorate, supposing that the cell efficiency is 50%
[Edited on 28-1-2008 by hashashan]
[Edited on 29-1-2008 by hashashan]
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hashashan
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Well its been 20 days already
no perchlorate has yet formed ... Is it possible that a cell with a conc. solution and magnetic stirring will be less efficient then 50%???
anyone has any ideas why is it taking so long?
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dann2
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Hello Hashashan,
I can't figure out from the posts how much LiCl you have in your cell.
50g per 100ml? How big is the cell 600ml?.
The efficiency may be below 50%.
Keep going.
At least when you do get to the Perchlorate stage things will finish up soon enough.
Dann2
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Xenoid
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| Quote: | Originally posted by hashashan
no perchlorate has yet formed ... |
Hashashan - have you made sure the (non)perchlorate solution from the cell was cool. If you remember, I found the Methylene Blue test doesn't work at
temperatures above about 35 oC.
Methylene Blue Testing: http://www.sciencemadness.org/talk/viewthread.php?tid=9783&page=1
Dann2 has also verified this. Make sure you cool your solution to, say, about 15 oC. first before doing the test!
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tentacles
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| Quote: | Originally posted by hashashan
Well its been 20 days already
no perchlorate has yet formed ... Is it possible that a cell with a conc. solution and magnetic stirring will be less efficient then 50%???
anyone has any ideas why is it taking so long? |
I did read somewhere that stirring the cell contents was detrimental to efficiency. One of those older JES papers. It was significant in some of their
tests - as much as 30% in cases were previously high effs were achieved. In low eff tests the difference was like 10-15%.
[Edited on 17-2-2008 by tentacles]
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hashashan
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Its a 6-7 mol cell ... the 6-7 is due to the fact that I added more lithium chloride as the solution evaporated. the volume is 1 liter
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hashashan
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ARGGGGGGGGGGGG
still no perchlorate . It really starts to piss me off.
I increased the voltage and now the cell is running at about 7 amps. that is about 250ma/cm2. hopefully that will help.
As the chloride level decreased I cant see any signs of erosion even at that current density(just like with Na).
@Xenoid : my solution temp. is quite low as it is ... about 20 degrees. Also when the perchlorate levels get high then the test work even in higher
temperature.
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chloric1
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not a good sign hashhashen, it has been 30 days I believe . The ions are conspiring against you. Did you get perchlorate when you used NaCl? I
don't remember if you added a catalyst like a fluoride or a persulfate. Are you getting high chlorate? IF so then maybe your chlorate is being
reduced at the cathode. Don't know but trying using a bigger cathode.
In the theater of life its nice to know where the exit doors are located.
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hashashan
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I got slight signs f perch 
and my cathode is twice the size of the anode
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