Abstract: Compositions comprising a first metal component and a second metal component wherein the molar ratio of the first metal component to the second metal component is in the range of 1:9 to 9:1, respectively, and wherein a surface of the second metal component is coated with the first metal component, is disclosed. Uses the compositions as catalysts are further disclosed. Electrochemical cells containing the compositions are further disclosed. A process of synthesizing ammonia using the compositions is further disclosed.

Abstract: A miniaturized electrochemical cell and a method for making it are provided. The method includes preparing at least one inner electrode of an electron conducting or semi-conducting material M1; providing a hollow support made of an electrically insulating material M6 and having at least one internal hollow channel; depositing on the external surface of the support a layer of an electrically conducting material M2; forming a template of colloidal particles of an electrically insulating material M3, on the M2 layer; depositing a layer of an electrically conducting material M4 on the M2 layer; depositing a layer L1 of an electron conducting or semi-conducting material M5 on the M4 layer, introducing the at least one inner electrode into the at least one internal hollow channel of the obtained structure; stabilizing the structure at its two open ends with an electrically insulating material M7; and removing M2, M3, M4 and M6 materials.