elementcollector1
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-OH resistant anode
I am trying to make Na- and KOH through the one-cell electrolysis of their carbonates (for Na, the bicarbonate). Is there an anode material that is
resistant/immune to carbon dioxide and alkali hydroxides?
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elementcollector1
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Never mind, nickel appears to work. Does not have an amphoteric oxide, metal, or hydroxide. Excellent!
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RadioTrefoil
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Graphite's the way to go. Nickel will corrode over time.
MESITYL FREAKING OXIDE
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plante1999
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platinum.
I never asked for this.
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woelen
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Nickel is good enough if you are electrolysing hydroxide solutions. Even plain copper wire works great with solutions of NaOH and makes O2 at the
anode without the copper dissolving.
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blogfast25
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Carbon is attacked by strong alkali. Platinum is overkill.
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plante1999
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If you don't want to overkill, iron can do the job, but it will add some impurity.
I never asked for this.
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hyfalcon
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I've got some grade 330 stainless steel that I'm trying to figure out how best to use in a cell myself. With it's high nickel content this might be a
good experiment.
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plante1999
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Never use SS steel as an anode in alkaline electrolyte, the chromium will leach out as chromate and the resultant nickel-iron alloy is like sponge and
will make flocculent hydroxide, all this happening pretty fast. I don't even explain in acid sol., SS is very unuseful as an anode.
I never asked for this.
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kristofvagyok
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I have never tried it, but a friend suggested Ti anode, what would be pretty cheap and it is highly resistant.
Or use Hg?
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phlogiston
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I think Ti will passivate. Stay away from Hg if you value your grey cells. Only resort to it if it is the only thing in the world that will do the
job. Use Nickel or Platinum.
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"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
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vmelkon
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A nice graphite rod from a D cell non alkaline battery is probably the cheapest solution.
You can try silicon if you want but the conductivity is very low.
As for Hg, I've always been curious about that one as an anode. I have only used it as a cathode.
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