NOVELTY - The hybrid energy storage device comprises an energy converting unit (200) comprising a first electrode (25), a second electrode and an energy converting medium arranged between the first and second electrodes, and an energy charge storing unit (100) comprising a first electrode (10), a second electrode and an electrolyte medium arranged between the first and second electrodes. The energy conversion takes place between the first and second electrodes of the energy converting unit. The energy charge is stored between the first and second electrodes of the energy charge storing unit.    USE - Used as a hybrid energy storage device.    ADVANTAGE - The hybrid device is flexible, and can be economically and easily manufactured with improved power conversion efficiency and increased internal and sheet resistances.    DETAILED DESCRIPTION - The hybrid energy storage device comprises an energy converting unit (200) comprising a first electrode (25), a second electrode and an energy converting medium arranged between the first and second electrodes, and an energy charge storing unit (100) comprising a first electrode (10), a second electrode and an electrolyte medium arranged between the first and second electrodes. The energy conversion takes place between the first and second electrodes of the energy converting unit. The energy charge is stored between the first and second electrodes of the energy charge storing unit. The second electrode of the energy converting unit and the second electrode of the energy charge storing unit are a shared electrode (30) electrically connecting the energy converting unit and the energy charge storing unit. The shared electrode is transparent or translucent or opaque electrode, comprises a metal and a mesoporous or macroporous nanostructured material, has a thickness of 10-200 nm, and comprises a first layer of the nanostructured material mixed with the metal particles or a first layer of the metal particles bound to the surface of the nanostructured material, and a second layer of the nanostructured material arranged on the first layer. The second layer of the nanostructured material is arranged between the first layer and the electrolyte medium of the energy charge storing unit. The energy converting unit, the energy charge storing unit and the shared electrode are made of printable materials. The energy converting unit consists of a fuel cell, an organic photovoltaic cell consisting of a thin film photovoltaic cell and a silica based photovoltaic cell, a thermoelectric converter and a piezoelectric converter. The energy charge storing unit is a supercapacitor. The metal of the shared electrode consists of a noble metal, a metal oxide, a metal alloy and/or an intermetallic, and is present in form of metal particles and a first layer that is present in direct contact with the energy converting medium of the energy converting unit. The alloy is made of elements consisting of group 10, 11, 12, 13, 14 and 16 of the periodic system. The nanostructured material forms a second layer arranged on the first layer, has a surface area of 50 m2/g and a dimension of less than 100 nm, and consists of single-walled, double-walled or multi-wall carbon nanotubes, nanowires, nanoflakes, nanoparticles, nanodiscs, and/or nanofilms. The second layer is present in direct contact with the electrolyte medium of the energy charge storing unit. The first layer of metal has a thickness of 100 nm. The metal particles have a maximal dimension of 1-20 nm, are mixed with the nanostructured material, are chemically bound to the surface of the nanostructured material via a linker, and are evenly dispersed at the surface of the nanostructured material. A particle size distribution for particles with a size of 2-5 nm is about plus minus 1 nm. The surface (5-80%) of the nanostructured material is covered with the metal particles. An INDEPENDENT CLAIM is included for a method of manufacturing a hybrid device.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a hybrid device.    First electrode of the energy charge storing unit (10)    Electrolyte medium layer (15)    First electrode of the energy converting unit (25)    Shared electrode (30)    Energy charge storing unit (100)    Energy converting unit. (200)