Device (110; 210; 310) for recovering hydrogen from water (2; 2') using a working substance, with: a first chamber (112; 212), into which a liquid, oxidizable working substance can be introduced; a working substance outlet, by means of which the working substance can be let out from the first chamber; wherein the working substance is an oxidizable metal or an alloy of oxidizable metals and is conductive for electrons; a second chamber (114; 314), into which water (2; 2') can be introduced, the water being able to split into hydrogen and oxygen in the second chamber (114; 314); a separating unit, which is designed and arranged to separate the first chamber (112; 212) from the second chamber (114; 314); wherein the separating unit is permeable to oxygen ions and impermeable to water (2; 2'); a first electrode unit (118; 218); a second electrode unit (120; 320); wherein, for conducting the electrons given off out of the working substance to the second electrode unit (120; 320), the first electrode unit (118; 218) can be connected in an electrically conducting manner to the working substance introduced into the first chamber (112; 212), so that the working substance in the first chamber (112; 212) acts as a liquid electrode; wherein, by means of the second electrode unit (120; 320), oxygen can be ionized into the oxygen ions by the electrons conducted to the second electrode unit (120; 320); so that the working substance in the first chamber (112; 212) can be at least partially oxidized by the oxygen ions while giving off electrons, whereby an oxidized working substance is created; and with a letting-out unit (121, 122, 128; 128), by means of which the hydrogen can be let out of the second chamber (114; 214; 314). a first chamber (112; 212), into which a liquid, oxidizable working substance can be introduced; a working substance outlet, by means of which the working substance can be let out from the first chamber; wherein the working substance is an oxidizable metal or an alloy of oxidizable metals and is conductive for electrons; a second chamber (114; 314), into which water (2; 2') can be introduced, the water being able to split into hydrogen and oxygen in the second chamber (114; 314); a separating unit, which is designed and arranged to separate the first chamber (112; 212) from the second chamber (114; 314); wherein the separating unit is permeable to oxygen ions and impermeable to water (2; 2'); a first electrode unit (118; 218); a second electrode unit (120; 320); wherein, for conducting the electrons given off out of the working substance to the second electrode unit (120; 320), the first electrode unit (118; 218) can be connected in an electrically conducting manner to the working substance introduced into the first chamber (112; 212), so that the working substance in the first chamber (112; 212) acts as a liquid electrode; wherein, by means of the second electrode unit (120; 320), oxygen can be ionized into the oxygen ions by the electrons conducted to the second electrode unit (120; 320); so that the working substance in the first chamber (112; 212) can be at least partially oxidized by the oxygen ions while giving off electrons, whereby an oxidized working substance is created; and with a letting-out unit (121, 122, 128; 128), by means of which the hydrogen can be let out of the second chamber (114; 214; 314).