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A thermoelectronic energy converter device (100) comprises an electron emitter (11) being adapted for a temperature-dependent release of electrons (1), an electron collector (21) being adapted for collecting the electrons (1), wherein the electron collector (21) is spaced from the electron emitter (

A thermoelectronic energy converter device (100) comprises an electron emitter (11) being adapted for a temperature-dependent release of electrons (1), an electron collector (21) being adapted for collecting the electrons (1), wherein the electron collector (21) is spaced from the electron emitter (11) by an evacuated gap (2), a gate electrode (31) being arranged between the electron emitter (11) and the electron collector (21) for subjecting the electrons (1) in the gap (2) to an accelerating electric potential, wherein the gate electrode (31) has a plurality of electrode openings (34) being arranged for transmitting electrons (1) miming from the electron emitter (11) to the electron collector (21), and a magnetic field device (50) being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector (11, 21), wherein the magnetic field device (50) is arranged such that at least a portion of the magnetic field lines pass through the electrode openings (34). Furthermore, a method of converting energy using the thermoelectronic energy converter device (100) is described.

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1. A thermoelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the electrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gat

1. A thermoelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the electrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode openings being arranged for transmitting electrons running from the electron emitter to the electron collector, andthe magnetic field device is arranged such that at least a portion of the magnetic field lines pass through the electrode openings, wherein the thermoelectronic energy converter device comprises at least one of the features: a distance between the electron emitter and the electron collector is at least one of above 1μm and below 0.3 mm,a thickness of the gate electrode is below 300 μm,at least one of the electron emitter and the electron collector is made of at least one of a metal, a conducting oxide, a semiconductor, a diamondoid, LaB6, and an electride,at least one of the electron emitter and the electron collector is doped with a work function lowering dopand, andat least one of the electron emitter and the electron collector is coated with a work function lowering coating. 2. The thermoelectronic energy converter device according to claim 1, wherein the gate electrode is a single sheet of an electrically conducting material. 3. The thermoelectronic energy converter device according to claim 1, wherein the gate electrode has a regular lattice structure including the plurality of electrode openings. 4. The thermoelectronic energy converter device according to claim 1, wherein the electrode openings have a cross-sectional dimension being equal to or smaller than five times a width of a spacing between the electron emitter and the electron collector. 5. The thermoelectronic energy converter device according to claim 1, comprising at least one of the features the distance between the electron emitter and the electron collector is at least one of above 10 μm and below 200 μm, andthe thickness of the gate electrode is below 250 μm. 6. The thermoelectronic energy converter device according to claim 1, further comprising a cooling device being arranged for cooling the electron collector. 7. The thermoelectronic energy converter device according to claim 1, wherein at least one of the electron emitter and the electron collector has a plane surface facing the gap. 8. The thermoelectronic energy converter device according to claim 1, wherein at least one of the electron emitter and the electron collector has a curved surface facing the gap. 9. The thermoelectronic energy converter device according to claim 1, wherein a tip structure distribution is formed on at least one of the electron emitter and the electron collector, wherein the tip structure distribution comprises at least one of micro-structures and nano-structures. 10. The thermoelectronic energy converter device according to claim 9, wherein the tip structure distribution is formed on surface sections of at least one of the electron emitter and the electron collector aligned with the electrode openings of the gate electrode. 11. The thermoelectronic energy converter device according to claim 1, wherein the gate electrode is electrically connected with a dc voltage source. 12. The thermoelectronic energy converter device according to claim 11, wherein the dc voltage source is adapted for superimposing the dc voltage with an ac voltage modulation. 13. The thermoelectronic energy converter device according to claim 1, wherein a work function of a material of the gate electrode is lower than a work function of a material of the electron emitter, andthe gate electrode is electrically connected with the electron emitter. 14. The thermoelectronic energy converter device according to claim 1, wherein a load circuit is connected between the electron emitter and the electron collector,the electron emitter is arranged for an application of at least one applied energy selected from the group consisting of thermal energy and radiation energy, andthe thermoelectronic energy converter device is configured for converting the applied energy to electric energy. 15. The thermoelectronic energy converter device according to claim 14, wherein a thermal engine is connected with the electron collector. 16. A method of converting energy using the thermoelectronic energy converter device according to claim 1, comprising the steps of: releasing electrons from the electron emitter,accelerating the electrons released from the electron emitter by the accelerating electric potential in the gap through the electrode openings toward the electron collector,subjecting the electrons released from the electron emitter to the magnetic field, wherein the magnetic field lines of the magnetic field pass through the electrode openings, andcollecting the electrons with the electron collector. 17. The method according to claim 16, further comprising cooling the electron collector with a cooling device. 18. The method according to claim 16, wherein the magnetic field is created with at least one of at least one permanent magnet and at least one electromagnet being arranged adjacent to or in a neighborhood of at least one of the electron emitter and the electron collector, respectively. 19. The method according to claim 18, wherein the at least one electromagnet comprises at least one superconducting coil. 20. The method according to claim 16, further comprising at least one of accelerating the electrons toward the electron collector with an auxiliary gate electrode, andshielding a surface of the gate electrode facing at least one of to and from the electron emitter with a shielding electrode. 21. The method according to claim 16, wherein the step of releasing the electrons from the electron emitter includes emitting electrons from at least one of micro- and nano-structures arranged on the electron emitter. 22. The method according to claim 16, wherein the step of collecting the electrons at the electron collector includes collecting the electrons with at least one of micro- and nano-structures arranged on the electron collector. 23. The method according to claim 16, wherein a dc voltage is applied to the gate electrode. 24. The method according to claim 23, wherein the dc voltage is superimposed with an ac voltage modulation. 25. The method according to claim 16, wherein a work function of a material of the gate electrode is lower than a work function of a material of the electron emitter,the gate electrode is electrically connected with the electron emitter, andthe accelerating electric potential in the gap is created by a difference of the work functions of the materials of the gate electrode and the electron emitter. 26. The method according to claim 16, wherein a load circuit is connected between the electron emitter and the electron collector,at least one applied energy selected from the group consisting of thermal energy and radiation energy is applied to the electron emitter, andthe thermoelectronic energy converter device is used for converting the applied energy to electric energy, so that an electric current is created in the load circuit between the electron emitter and the electron collector. 27. The method according to claim 26, wherein a thermal engine is connected with the electron collector. 28. The method according to claim 16, wherein a power source is connected between the electron emitter and the electron collector,an electric voltage is applied between the electron emitter and the electron collector, andthe thermoelectronic energy converter device is used for converting electric energy to thermal energy, wherein the electron emitter is cooled by the release of the electrons or the electron collector is heated by the collection of electrons in response to the application of the electric voltage. 29. The method according to claim 28, wherein the electron emitter is cooled by the release of the electrons and the electron collector is heated by the collection of electrons in response to the application of the electric voltage. 30. A thermooelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the electrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode openings being arranged for transmitting electrons running from the electron emitter to the electron collector, andthe magnetic field device is arranged such that at least a portion of the magnetic field lines pass through the electrode openings, whereinthe gate electrode has a honeycomb lattice structure. 31. A thermoelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the electrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode openings being arranged for transmitting electrons running from the electron emitter to electron collector, andthe magnetic field device is arranged such that at least a portion of the magnetic field lines pass through the electrode openings, wherein the magnetic field device includes at least one of the features:the magnetic field device includes at least one of at least one permanent magnet and at least one electromagnet being arranged adjacent to or in a neighborhood of at least one of the electron emitter and the electron collector, respectively,the magnetic field device includes a magnetic yoke being arranged for confining the magnetic field lines, andthe magnetic field device is adapted for creating the magnetic field with sections of increased field strength according to positions of the electrode openings. 32. The thermoelectronic energy converter device according to claim 31, wherein the at least one electromagnet comprises at least one superconducting coil. 33. A thermoelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the eletrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode opening being arranged for transmitting electronics running from the electron emitter to the electron collector, andthe magnetic field device is arranged such that at least a portion of the magnetic field lines pass through the electrode openings, whereinthe gate electrode is supported by the electron emitter or the electron collector, wherein the gate electrode is electrically insulated relative to the electron emitter or electron collector, respectively. 34. The thermoelectronic energy converter device according to claim 33, wherein the gate electrode is electrically insulated relative to the electron emitter or electron collector by an insulator layer, andthe insulator layer has insulator openings aligned with the electrode openings. 35. The thermoelectronic energy converter device according to claim 33, wherein the gate electrode and the insulator layer are deposit coatings formed on the electron emitter or the electron collector, respectively. 36. A thermoelectronic energy conveter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collecter being adapted for collecting the electrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode openings being arranged for transmitting electrons running from the electron emitter to the electron collector, andthe magnetic field device is arragned such that at least a portion of the magnetic field lines pass through the electrode openings, further comprisingat least one of at least one auxiliary gate electrode and at least one shielding electrode being arranged between the electron emitter and the electron collector. 37. The thermoelectronic energy converter device according to claim 36, comprising at least one of the features the at least one auxiliary gate electrode is arranged for creating an additional accelerating potential,the at least one shielding electrode is arranged for shielding a surface of the gate electrode facing the electron emitter,the at least one shielding electrode is arranged for shielding a surface of the gate electrode facing away from the electron emitter, andthe at least one shielding electrode is arranged for shielding inner walls of the electrode openings. 38. A thermoelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the electrons, wherein the electron collector is spaced from the electron emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode openings being arranged for transmitting electrons running from the electron emitter to the electron collector, andthe magentic field device is arranged such that at least a portion of the magnetic field lines pass through the electrode openings, whereinthe electron collector or the gate electrode carries a reflective layer being adapted for at least one of reflecting visible and thermal radiation back to the electron emitter. 39. A thermoelectronic energy converter device, comprising: an electron emitter being adapted for a temperature-dependent release of electrons,an electron collector being adapted for collecting the electrons, wherein the electron collector is spaced from the electon emitter by an evacuated gap,a gate electrode being arranged between the electron emitter and the electron collector for subjecting the electrons in the gap to an accelerating electric potential, anda magnetic field device being arranged for creating a magnetic field with magnetic field lines extending between the electron emitter and the electron collector, whereinthe gate electrode has a plurality of electrode openings being arranged for transmitting electrons running from the electron emitter to the electron collector, andthe magnetic field device is arranged such that at least a portion of the magnetic field lines pass through the electrode openings, whereina power source is connected between the electron emitter and the electron collector,the electron emitter is arranged as a heat sink to be cooled by the release of the electrons or the electron collector is arranged as a heat source to be heated by the collection of the electrons, andthe thermoelectronic energy converter device is configured for converting electric energy to thermal energy. 40. The thermoelectronic energy converter device according to claim 39, wherein the electron emitter is arranged as a heat sink to be cooled by the release of the electrons and the electron collector is arranged as a heat source to be heated by the collection of the electrons.