Apparatus and associated methods

1. An apparatus comprising a layer of electrically conductive material with an open interconnected wall structure of electrically conductive material formed thereon, the open interconnected wall structure having a gyroid structure defined by a lattice of substantially spherical particles defining one or more open pores, some or all of the open pores being arranged periodically, the one or more open pores being located in the wall structure, and an active material deposited within the one or more open pores, the active material for use in generating and/or storing electrical charge, wherein the layer of electrically conductive material and the open interconnected wall structure together form a charge collector which provides an electrical path from the active material for the generated and/or stored electrical charge, wherein only some of the open pores are interconnecting, and wherein at least some of the open pores have a diameter of between 2 nm and 50 nm inclusive.

2. The apparatus of claim 1 , wherein the layer and open interconnected wall structure are formed from the same electrically conductive material, or are formed from different electrically conductive materials.

3. The apparatus of claim 1 , wherein some or all of the open pores form through channels within the open interconnected wall structure to the underlying layer of electrically conductive material, and wherein some or all of the open pores form blind channels within the open interconnected wall structure.

4. The apparatus of claim 1 , wherein the active material forms a coating on the open interconnected wall structure without fully filling the volume of the one or more open pores.

5. The apparatus of claim 1 , wherein the active material fully fills the volume of the one or more open pores.

6. The apparatus of claim 1 , wherein the layer of electrically conductive material is a constituent layer of a printed wiring board.

7. The apparatus of claim 1 , wherein the apparatus is one or more of an electrical storage apparatus, a flexible electrical storage apparatus, a stretchable electrical storage apparatus, an electrode for an electrical storage apparatus, a flexible electrode for an electrical storage apparatus and a stretchable electrode for an electrical storage apparatus.

8. A method of making an apparatus, the method comprising:

forming a deposition template on top of a layer of electrically conductive material, the deposition template comprising one or more open pores between the walls of the deposition template, the one or more open pores extending continuously from an outer surface of the deposition template to the underlying layer of electrically conductive material; and

depositing an electrically conductive material through the one or more open pores and over the walls of the deposition template to form an open interconnected wall structure of electrically conductive material on top of the layer of electrically conductive material, the open interconnected wall structure defined by a lattice of substantially spherical particles defining one or more open pores, some or all of the open pores being arranged periodically, the one or more open pores being located in the wall structure, and depositing an active material within the one or more open pores, the active material for use in generating and/or storing electrical charge, wherein the layer of electrically conductive material and the open interconnected wall structure together form a charge collector which provides an electrical path from the active material for the generated and/or stored electrical charge, wherein only some of the open pores are interconnecting, and wherein at least some of the open pores have a diameter of between 2 nm and 50 nm inclusive.

9. The method of claim 8 , wherein the method comprises removing the deposition template following deposition of the electrically conductive material.

10. The method of claim 8 , wherein forming the deposition template comprises depositing a plurality of particles on top of the layer of electrically conductive material to create the lattice of particles, the lattice of particles constituting the deposition template, the open pores of the deposition template formed from interconnected spaces between and defined by the plurality of particles.

11. The method of claim 8 , wherein forming the deposition template comprises:

depositing a block copolymer on top of the layer of electrically conductive material, the block copolymer comprising two or more immiscible polymer blocks; and

removing one or more of the immiscible polymer blocks to produce an open porous polymer structure, the open porous polymer structure constituting the deposition template.

12. The method of claim 11 , wherein the one or more immiscible polymer blocks are removed to produce an open porous polymer structure having a gyroid, double gyroid, vertically-oriented pillar or vertically-oriented lamellar morphology.

13. A method of making an apparatus, the method comprising:

forming an etching template on top of a layer of electrically conductive material, the etching template comprising one or more open pores extending continuously from an outer surface of the etching template to the underlying layer of electrically conductive material; and

removing regions of the layer of electrically conductive material by depositing an etchant onto the layer of electrically conductive material via the one or more open pores of the etching template to form an open interconnected wall structure of electrically conductive material from the layer of electrically conductive material, the open interconnected wall structure defined by a lattice of substantially spherical particles defining one or more open pores, some or all of the open pores being arranged periodically, the one or more open pores being located in the wall structure, and depositing an active material within the one or more open pores, the active material for use in generating and/or storing electrical charge, wherein the open interconnected wall structure serves as a charge collector which provides an electrical path from the active material for the generated and/or stored electrical charge, wherein only some of the open pores are interconnecting, and wherein at least some of the open pores have a diameter of between 2 nm and 50 nm inclusive.

14. The method of claim 13 , wherein the method comprises removing the etching template following removal of the regions of the layer of electrically conductive material.

15. The method of claim 13 , wherein forming the etching template comprises depositing a plurality of particles on top of the layer of electrically conductive material to create the lattice of particles, the lattice of particles constituting the etching template, the open pores of the etching template formed from interconnected spaces between and defined by the plurality of particles.

16. The method of claim 13 , wherein forming the etching template comprises:

depositing a block copolymer on top of the layer of electrically conductive material, the block copolymer comprising two or more immiscible polymer blocks; and

removing one or more of the immiscible polymer blocks to produce an open porous polymer structure, the open porous polymer structure constituting the etching template.

17. The method of claim 16 , wherein the one or more immiscible polymer blocks are removed to produce an open porous polymer structure having a gyroid, double gyroid, vertically-oriented pillar or vertically-oriented lamellar morphology.

18. The apparatus of claim 1 , wherein the open interconnected wall structure takes on a face-centered cubic opal shape of the lattice.