The older implementations of the Hall-Heroult process generated their anodes in continuous fashion by adding pitch, which (at the high temperatures
involved) baked into a suitable carbon anode. Now, coal tar pitch has a much lower oxygen content than sugar, so the porosity that comes from gasses
being expelled will be a lot lower. And it may also be that the anodes are only good enough conductors at the high temperatures used in the process.
Anyway, your idea is not completely crazy: http://www.electrochemsci.org/papers/vol8/80202702.pdf
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