Hydrogen Storage Element for a Hydrogen Store

Abstract

The hydrogen storage element for a hydrogen store comprises a pressed article having a hydrogen-storing first material and having a thermally conductive second material, wherein the second material is in thermal contact with the hydrogen-storing first material and has, in some regions, a different three-dimensional distribution within the pressed article.

1 . A hydrogen storage element for a hydrogen storage means comprising:
 a compact comprising a first material having hydrogen storage capacity and comprising a heat-conducting second material,   wherein the second material is in thermal contact with the first material having hydrogen storage capacity and has, in some regions, a different three-dimensional distribution within the compact.   
     
     
         2 . The hydrogen storage element as claimed in  claim 1 , wherein the three-dimensional distribution of the second material has repeating sections and each section has three-dimensional distributions. 
     
     
         3 . The hydrogen storage element as claimed in  claim 1 , wherein the heat-conducting second material takes the form of a layer, film or ribbon. 
     
     
         4 . The hydrogen storage element as claimed in  claim 3 , wherein the layer, film and/or ribbon is arranged primarily in a plane of extension of any shape, with subregions of the layer, film and/or ribbon having one or more alignments differing from this plane of extension. 
     
     
         5 . The hydrogen storage element as claimed in  claim 3 , wherein the layer, film and/or ribbon has a helical or screw form and is embedded into the first material having hydrogen storage capacity. 
     
     
         6 . The hydrogen storage element as claimed in  claim 1 , wherein the heat-conducting second material takes the form of a free-flowing material and/or of a bed in the compact prior to pressing thereof. 
     
     
         7 . The hydrogen storage element as claimed in  claim 6 , wherein the heat-conducting second material has an additive which prevents alloy formation of the heat-conducting second material with the first material having hydrogen storage capacity. 
     
     
         8 . The hydrogen storage element as claimed in  claim 7 , wherein the heat-conducting second material comprises aluminum or an aluminum alloy, in that the first material having hydrogen storage capacity comprises magnesium or a magnesium alloy, and in that the additive comprises graphite, expandable graphite and/or naturally expanded graphite which separates the aluminum or the aluminum alloy from the magnesium or magnesium alloy. 
     
     
         9 . The hydrogen storage element as claimed in  claim 7 , wherein the additive is arranged as a separating layer between the first material having hydrogen storage capacity and the heat-conducting second material. 
     
     
         10 . The hydrogen storage element as claimed in  claim 1 , wherein the heat-conducting second material is permeable to at least hydrogen, preferably with horizontal alignment of lenticular graphite particles on filling, such that it is possible to utilize conduction of heat in the direction of a hexagonal lattice structure of a graphite structure. 
     
     
         11 . The hydrogen storage element as claimed in  claim 1 , wherein the heat-conducting second material is permeable to a fluid, especially a liquid- and/or gas-comprising heat carrier flow for removal of heat in the course of hydrogenation and for supply of heat in the course of dehydrogenation of the first material having hydrogen storage capacity. 
     
     
         12 . The hydrogen storage element as claimed in  claim 1 , wherein the compact comprises a third material having heat carrier transport capacity, which is permeable to a fluid, especially a liquid- and/or gas-comprising heat carrier flow for removal of heat in the course of hydrogenation and for supply of heat in the course of dehydrogenation of the first material having hydrogen storage capacity, and in that the third material having heat carrier transport capacity is arranged adjacent to the first material having hydrogen storage capacity and/or to the heat-conducting second material of the compact therein. 
     
     
         13 . The hydrogen storage element as claimed in  claim 11 , wherein the third material having heat carrier transport capacity and/or the heat-conducting second material is porous and/or has open and/or closed cells. 
     
     
         14 . The hydrogen storage element as claimed in  claim 1 , wherein the first material having hydrogen storage capacity comprises a polymer as binder for hydrogenatable material of the first material having hydrogen storage capacity.