An ionically conductive ceramic element (20) comprises a plurality of tubes (30) each having interior (24) and exterior (38) surfaces and closed (48) and open (50) ends. A tube support (14) receives open tube ends (50). A first electrically conductive coating (36) is formed on the exterior tube surfaces (38). A second coating (22) is formed on the interior tube surfaces (24). A bottom electrically conductive stripe (16) makes electrical connections between second coatings (22) on the interior tube surfaces (24). A top electrically conductive stripe (40) creates electrical connections between first coatings (36) on the exterior tube surfaces (38). The top and bottom stripes are connected such that at least one stripe (40) on the top is electrically connected to at least one stripe (16) on the bottom.