Abstract: An electrocatalytic process is described for producing higher molecular weight hydrocarbons from lower molecular weight hydrocarbons. The process is conducted in an electrogenerative cell and generally comprises the steps of(A) providing a fuel cell comprising a solid electrolyte having a first surface coated with conductive metal, metal oxide or mixtures thereof capable of catalyzing the reduction of oxygen to oxygen ions, and a second surface coated with metal, metal oxide or mixtures thereof, provided that when both coatings are silver coatings, or the first coating is silver and the second coating is a silver/bismuth coating, the second coating also contains at least one other metal, the two conductive coatings being connected by an external circuit,(B) passing an oxygen-containing gas in contact with the first conductive coating while,(C) passing a low molecular weight hydrocarbon-containing feed gas in contact with the second conductive coating, and(D) recovering higher molecular weight hydrocarbons.