Protective coating for metalhydride based devices

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(57) Abstract : A switchable mirror device comprising active layer (4) wherein said active layer changes its optical properties by adding/removal of hydrogen and comprises a Mg-transition metal layer, or an Y or rare earth based layer said active layer being provided on one side with a further protective layer (3) comprising a hydrogen and oxygen permeable and water impermeable layer, haracterized in that said layer is liquid water impermeable and water vapor permeable and has hydrophobic surface properties. A pd catalyst layer (5) may be disposed between the active layer (4) and the protective layer (3).