Abstract: An agricultural unit includes a tank system that is adapted to provide a combined aquatic environment for raising aquatic animals in aquaculture and for cultivating plants in hydroponic culture and an electrochemical device. The tank system releases excretions of the aquatic animals directly into the aquatic environment so as to produce nutrients for the plants while the electrochemical device is operable in an electrolysis mode to produce hydrogen and oxygen while consuming electrical energy provided by a source of electrical energy and is further operable in a fuel cell mode to produce electrical energy and heat by oxidizing the produced hydrogen. The electrochemical device is operatively coupled to the tank system so as to transfer at least part of the produced heat and the produced oxygen to the aquatic environment.

Abstract: An agricultural unit and use thereof relates to: a tank system adapted to provide a combined aquatic environment for raising aquatic animals in aquaculture and cultivating plants in hydroponic culture, whereby excretions of the aquatic animals are released directly into the aquatic environment so as to produce nutrients for the plants; and an electrochemical device; wherein the electrochemical device is operable in an electrolysis mode to produce hydrogen and oxygen while consuming electrical energy provided by a source of electrical energy; wherein the electrochemical device is further operable in a fuel cell mode to produce electrical energy and heat by oxidizing the produced hydrogen; and wherein the electrochemical device is operatively coupled to the tank system so as to transfer at least part of the produced heat and the produced oxygen to the aquatic environment.

Abstract: A membrane-electrode assembly for use in a reversible fuel cell comprises an ion conductive membrane having first and second surfaces; a first electrocatalyst layer in contact with the first surface of the membrane, such first electrocatalyst layer comprising at least one discrete electrolysis-active area (ELE1i) and at least one discrete energy generation-active area (EG1i). A second electrocatalyst layer is placed in contact with the second surface of the membrane, such second electrocatalyst layer comprising at least one discrete electrolysis-active area (ELE2i) and at least one discrete energy generation-active area (EG2i).

Abstract: A membrane-electrode assembly for use in a reversible fuel cell comprises an ion conductive membrane having first and second surfaces; a first electrocatalyst layer in contact with the first surface of the membrane, such first electrocatalyst layer comprising at least one discrete electrolysis-active area (ELE1i) and at least one discrete energy generation-active area (EG1i). A second electrocatalyst layer is placed in contact with the second surface of the membrane, such second electrocatalyst layer comprising at least one discrete electrolysis-active area (ELE2i) and at least one discrete energy generation-active area (EG2i).

Abstract: The present invention concerns holding frames as in FIG. 1 for use in an integrated electrolyser module of the filter-press type for the electrolytic production of gasses with internal degassing chambers and further concerns an electrolyser comprising said module.

Abstract: A high pressure electrolyzer as represented in the figure, having a number of electrolysis chambers being held in frame (1), being separated by membrane (2) to which the electrodes (3) are pressed. The electrodes are electrically connected to the bipolar plate (4) with a metal woven sheet (5). The frame has the larger conduit openings (7) on the top side and (8) on the bottom side. Conduit openings (7) evacuate the gas that is generated and openings (8) form a supply channel of electrolyte. Opening (7) is connected to the electrolyzer module's inner space with the small connecting conduit (9) and similarly opening (8) is connected to the inner space via small connecting conduit (10). A ring shaped frame having conduit openings for the supply of electrolyte and the removal of the gasses that are generated and further having a connecting surface with concentric elevations and depressions.

Abstract: A potential pulse train corresponding to the reaction proceeding at the electrode is superposed on the potential of the electrode for influencing an electrocatalytic reaction proceeding at that electrode.Examples of such reactions are the oxidation of methanol on a platinum electrode and the oxidation of hydrogen, hydrazine or ammonia on an alloy electrode.