|Jun28-10, 01:13 PM||#1|
Blog Entries: 1
Graphite leads in electrolysis
What is it about graphite leads that make them so much better for electrolysis than, say, copper leads? I tried it both ways, connecting leads to a battery and then sticking them in some water and with the graphite leads there was much more bubbling going on. So what is it about the graphite? Thanks.
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|Jun28-10, 01:52 PM||#2|
CO2 (g) + 4 H+ (aq) + 4 e- --> C (s) + 2 H2O (l) has an E0 of +0.20 V,
making carbon somewhat easier to oxidize than copper (E0 = +0.34).
So carbon electrodes do deteriorate slowly. The benefit is that their oxidation product (carbon dioxide) is a gas,
so it doesn't interfere much. And that carbon is simply a lot cheaper than e.g. copper (and especially platinum).
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