Decomposition during electrolysis

[Primarygun]

If a solution containing carbonate is being electrolysed, does not decomposition of carbonate into carbon dioxide become more favourable?

[MetaFrizzics]

Don't you need a catalyst such as platinum, and another element for the carbon to combine with besides hydrogen? Perhaps a surplus of oxygen could allow the process to speed up.

[Primarygun]

Does passing electric current does?

Water can be splitted very easily into hydrogen and oxygen but it is rather difficult for it to decompose spontaneously at high temperature.

[DV8 2XL]

Look at the electromotive series. H2O bonds break before CO3.