NOVELTY - The multi-layer composite getter (20) comprises a support (11) that is made of a metallic getter material and has two surfaces. A layer of palladium or palladium-based composites (13): is provided on one of the surfaces defining a coated surface; is present in direct contact with the support; is disposed on only one surface of the support; covers 80% of the surface of the coated surface; and has a thickness of 10-2000 nm. A polymeric protective layer (14) permeable to hydrogen is provided on 80% of the surface of the coated surface, and has a thickness of 1-150 mu m.    USE - The multi-layer composite getter is useful for removal of hydrogen, and in an energy storage electrochemical device such as a lithium battery, a supercapacitor and an electrolytic capacitor (all claimed).    ADVANTAGE - The multi-layer composite getter ensures effective removal of the hydrogen with high safety and reduced energy consumption.    DETAILED DESCRIPTION - The multi-layer composite getter (20) comprises a support (11) that is made of a metallic getter material and has two surfaces. A layer of palladium or palladium-based composites (13): is provided on one of the surfaces defining a coated surface; is present in direct contact with the support; is disposed on only one surface of the support; covers 80% of the surface of the coated surface; and has a thickness of 10-2000 nm. A polymeric protective layer (14) permeable to hydrogen is provided on 80% of the surface of the coated surface, and has a thickness of 1-150 mu m. Auxiliary getter materials (15) are dispersed in the polymeric protective layer permeable to hydrogen with a weight concentration of 15-30 wt.% calculated on the overall weight of the polymeric layer containing the auxiliary getter materials. A metallic layer is present between the support and the layer of palladium or palladium-based composites. The polymeric protective layer permeable to hydrogen containing an auxiliary getter material has a hydrogen permeability of greater than or equal to 10-12 cm3 cm cm-2 s-1 Pa-1 at 25 degrees C, 1 bar. The support has a thickness of 20-500 mu m. The auxiliary getter material is used in discrete form, and is present in form of particulate having maximum size of 2 mu m and maximum dimension of 30-500 nm. The thickness of the protective polymeric layer permeable to hydrogen is twice the maximum size of the auxiliary getter material in form of particulate. An INDEPENDENT CLAIM is included for an energy storage electrochemical device.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a multi-layer composite getter.    Support (11)    Palladium or palladium-based composites (13)    Polymeric protective layer (14)    Auxiliary getter materials (15)    Multi-layer composite getter. (20)