An alkaline water electrolysis system includes: a plurality of reaction chambers, each including a main electrode and an auxiliary electrode; a piston provided in each reaction chamber to change a volume of the reaction chamber through reciprocating motion; a drive motor; a connecting rod and a crankshaft installed to change rotational motion of the drive motor into reciprocating linear motion of the piston; a plurality of gas valves installed on an upper side of the reaction chamber to discharge hydrogen and oxygen generated in the reaction chamber through different paths, respectively; a pressure sensor installed in the reaction chamber; a controller configured to open and close the gas valves in response to a signal received from the pressure sensor; and an electrolyte supply apparatus provided to supply an electrolyte to the reaction chambers.

An alkaline water electrolysis system includes: a plurality of reaction chambers, each including a main electrode and an auxiliary electrode; a piston provided in each reaction chamber to change a volume of the reaction chamber through reciprocating motion; a drive motor; a connecting rod and a crankshaft installed to change rotational motion of the drive motor into reciprocating linear motion of the piston; a plurality of gas valves installed on an upper side of the reaction chamber to discharge hydrogen and oxygen generated in the reaction chamber through different paths, respectively; a pressure sensor installed in the reaction chamber; a controller configured to open and close the gas valves in response to a signal received from the pressure sensor; and an electrolyte supply apparatus provided to supply an electrolyte to the reaction chambers.

An electrolyzer has an electrolytic cell with a membrane that surrounds an interior channel. The electrolytic cell also has a first electrode positioned in the interior channel such that the membrane surrounds the first electrode. The electrolytic cell also includes a second electrode positioned such that the membrane is located between the first electrode and the second electrode.

An electrolyzer has an electrolytic cell with a membrane that surrounds an interior channel. The electrolytic cell also has a first electrode positioned in the interior channel such that the membrane surrounds the first electrode. The electrolytic cell also includes a second electrode positioned such that the membrane is located between the first electrode and the second electrode.

An object is to provide a methane synthesis device having as a whole a reduced size and a simplified configuration. A methane synthesis device 100 is composed of respective components from an end plate 2 at the leftmost side to an end plate 23 at the rightmost side and is compactly assembled by fastening plural bolts and nuts to bring these individual components into tightly contact with each other. The components may be divided into a Sabatier reaction unit of signs 3 to 9, a water electrolysis unit of signs 13 to 19, and other components. Hydrogen gas generated in the water electrolysis unit is mixed with carbon dioxide gas and supplied to the Sabatier reaction unit, and methane is synthesized in the Sabatier reaction unit. The size of the device is reduced as a whole and configuration is simplified by integrally stacking the water electrolysis unit, the Sabatier reaction unit, a carbon dioxide supplying unit, and a hydrogen gas supplying unit.

An object is to provide a methane synthesis device having as a whole a reduced size and a simplified configuration. A methane synthesis device 100 is composed of respective components from an end plate 2 at the leftmost side to an end plate 23 at the rightmost side and is compactly assembled by fastening plural bolts and nuts to bring these individual components into tightly contact with each other. The components may be divided into a Sabatier reaction unit of signs 3 to 9, a water electrolysis unit of signs 13 to 19, and other components. Hydrogen gas generated in the water electrolysis unit is mixed with carbon dioxide gas and supplied to the Sabatier reaction unit, and methane is synthesized in the Sabatier reaction unit. The size of the device is reduced as a whole and configuration is simplified by integrally stacking the water electrolysis unit, the Sabatier reaction unit, a carbon dioxide supplying unit, and a hydrogen gas supplying unit.

An alkaline water electrolysis system includes: a plurality of reaction chambers, each including a main electrode and an auxiliary electrode; a piston provided in each reaction chamber to change a volume of the reaction chamber through reciprocating motion; a drive motor; a connecting rod and a crankshaft installed to change rotational motion of the drive motor into reciprocating linear motion of the piston; a plurality of gas valves installed on an upper side of the reaction chamber to discharge hydrogen and oxygen generated in the reaction chamber through different paths, respectively; a pressure sensor installed in the reaction chamber; a controller configured to open and close the gas valves in response to a signal received from the pressure sensor; and an electrolyte supply apparatus provided to supply an electrolyte to the reaction chambers.

An alkaline water electrolysis system includes: a plurality of reaction chambers, each including a main electrode and an auxiliary electrode; a piston provided in each reaction chamber to change a volume of the reaction chamber through reciprocating motion; a drive motor; a connecting rod and a crankshaft installed to change rotational motion of the drive motor into reciprocating linear motion of the piston; a plurality of gas valves installed on an upper side of the reaction chamber to discharge hydrogen and oxygen generated in the reaction chamber through different paths, respectively; a pressure sensor installed in the reaction chamber; a controller configured to open and close the gas valves in response to a signal received from the pressure sensor; and an electrolyte supply apparatus provided to supply an electrolyte to the reaction chambers.

A high-pressure electrolyzer assembly includes a pressure vessel having two dome-shaped ends, and an electrolyzer arranged inside the pressure vessel. The pressure vessel is pressurized using an inert gas or a process gas of the electrolyzer. A vehicle may include at least one such electrolyzer assembly.

A high-pressure electrolyzer assembly includes a pressure vessel having two dome-shaped ends, and an electrolyzer arranged inside the pressure vessel. The pressure vessel is pressurized using an inert gas or a process gas of the electrolyzer. A vehicle may include at least one such electrolyzer assembly.