Electro-reduction of carbon dioxide

[Clea]

Hi all,

I want to reduce carbon dioxide into formic acid via electrolysis with a tin or carbon rotating cathode

I plan to use glycerol carbon dioxide solution as my catholyte.

But i looked online and found no-one uses glycerol, but methanol instead.

Glycerol is a better solvent compared to methanol and it is also less toxic. So why don't we use glycerol?

Is there something I'm not aware of?