Abstract: A hydrogen storage device is described. The hydrogen storage device comprises a heater/cooler module (6) and a pressure containment vessel (1) defining an interior volume and having within it: a thermally conducting network (4) having a face in thermal contact with the heater/cooler module (6), the shape of the thermally conducting network (4) being a fractal geometry in two or three dimensions; optionally a metal foam in thermal contact with the thermally conducting network (4); and a hydrogen storage material (5) in thermal contact with the thermally conducting network (4).

Abstract: A hydrogen storage device 200 comprises: a first vessel 230, having a first fluid inlet 210 and/or a first fluid outlet 220, having therein a thermally conducting network 240 thermally coupled to a first heater (not shown); wherein the first vessel 230 is arranged to receive therein a hydrogen storage material in thermal contact, at least in part, with the thermally conducting network 240; wherein the thermally conducting network 240 has a lattice geometry, a gyroidal geometry and/or a fractal geometry in two and/or three dimensions, comprising a plurality of nodes, having thermally conducting arms therebetween, with voids between the arms; and wherein the hydrogen storage material comprises and/or is a liquid organic hydrogen carrier, LOHC.

Abstract: A hydrogen storage device (100A) comprises: a pressure vessel (230A), having a first fluid inlet (210A) and/or a first fluid outlet (220A), having therein a thermally conducting network (240A) optionally thermally coupled to a first heater and/or a first cooler; wherein the pressure vessel (230A) is arranged to receive therein a hydrogen storage material in thermal contact, at least in part, with the thermally conducting network (240A); wherein the thermally conducting network (240A) preferably has a lattice geometry, a gyroidal geometry and/or a fractal geometry in two and/or three dimensions, comprising a plurality of nodes, having thermally conducting arms therebetween, with voids between the arms; and wherein the thermally conducting network (240A) comprises fluidically interconnected passageways therein, for example within the arms and/or the nodes thereof, for flow therethough of a fluid.

Abstract: A vehicle (10), preferably an unmanned and/or autonomous vehicle for example an unmanned aerial vehicle, UAV, is described.

Abstract: A power supply 100 is described.

Abstract: A hydrogen storage device is described. The hydrogen storage device comprises a heater/cooler module (6) and a pressure containment vessel (1) defining an interior volume and having within it: a thermally conducting network (4) having a face in thermal contact with the heater/cooler module (6), the shape of the thermally conducting network (4) being a fractal geometry in two or three dimensions; optionally a metal foam in thermal contact with the thermally conducting network (4); and a hydrogen storage material (5) in thermal contact with the thermally conducting network (4).