NOVELTY - The monolithic electrolytic assembly comprises a monolithic support structure having a first side (16) and a second opposing side (18), an electrolytic layer having a first electrolyte side and a second electrolyte side, and a first porous electrode material and a second porous electrode material formed over the first and second electrolyte sides of the electrolytic layer respectively. The monolithic support structure resides between a first plane and a second parallel plane. The first and second planes are intersected by contact surfaces of the first and second sides respectively.    USE - The monolithic electrolytic assembly is useful in a solar-powered, solid oxide electrolytic device such as a solid oxide fuel cell and a solid oxide gas separation device for hydrogen generation, and in an annular solid oxide electrolytic stack having a radial gas flow unit (all claimed).    ADVANTAGE - The monolithic electrolytic assembly provides reliable and durable interconnect for structural and electrical components of the solid oxide electrolytic device, and can be economically manufactured with increased surface area and without any danger.    DETAILED DESCRIPTION - The monolithic electrolytic assembly comprises a monolithic support structure having a first side (16) and a second opposing side (18), an electrolytic layer having a first electrolyte side and a second electrolyte side, and a first porous electrode material and a second porous electrode material formed over the first and second electrolyte sides of the electrolytic layer respectively. The monolithic support structure resides between a first plane and a second parallel plane. The first and second planes are intersected by contact surfaces of the first and second sides respectively. The contact surfaces of the second side comprise a periodic array of raised features separated by via features. The raised features and via features are interspersed between a periodic array of through-hole features. The via features form via spaces communicatively connecting adjacent through-hole structures of the support structure. The electrolytic layer is formed within the through-hole features, and has a thickness of less than 1 mm. The support structure is a steel sheet having a thickness of hundreds of micrometers. INDEPENDENT CLAIMS are included for:    (1) a process of forming a monolithic electrolytic assembly in a solid oxide electrolytic device; and    (2) a solar-powered, solid oxide electrolytic apparatus.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a monolithic electrolytic assembly.    Protective layer (2)    First side (16)    Second side (18)    Photo resist (90)    Removed resist (94)    Initial etched contour. (96)