Electrochemical CO2 reduction (ECR) is a promising solution for utilizing carbon dioxide, converting it into value-added chemicals, while exploiting excess energy from intermittent renewable sources. The state-of-art electrocatalysts for ECR are transition metals (TMs), such as Ag for CO production, but the existence of linear energy scaling relations among the different reaction intermediates limits the maximum catalytic efficiency achievable with these materials. Instead, transition metal dichalcogenides (TMDs) are a promising alternative to TMs as they overcome these linear energy scaling relations and can, in principle, achieve higher CO2 reduction activity to complex products. Crystalline TMDs (c-TMDs) exhibit high catalytic activity in the edge sites, where CO is produced with high selectivity, when the undesired side reaction - Hydrogen Evolution Reaction (HER) - is suppressed.