Systems and methods are provided for operating an electrolyzer. The electrolyzer comprising a plurality of electrolytic cells, each of the electrolytic cells comprising an electrolyte and two electrodes, the systems and methods comprising: a common voltage converter coupled in parallel to the plurality of electrolytic cells and configured to distribute power to the plurality of electrolytic cells; and control circuitry coupled to the plurality of electrolytic cells, the control circuitry configured to: monitor one or more parameters of the plurality of electrolytic cells; and generate, based on the one or more parameters, a model representing operating conditions of the electrolytic cells on an individual electrolytic cell basis.

A metal sulfate manufacturing system comprising an electrochemical dissolution system having, an anode electrode that holds metal raw material, a cathode electrode, an electrolyte bath having an inlet to receive an initial acid or metal-acid complex solution and an outlet to discharge the treated metal sulfate solution, stirring equipment that mixes the electrolyte bath, a temperature control system, and a rectifier that supplies current at constant voltage between the anode and cathode electrode.

A metal sulfate manufacturing system comprising an electrochemical dissolution system having, an anode electrode that holds metal raw material, a cathode electrode, an electrolyte bath having an inlet to receive an initial acid or metal-acid complex solution and an outlet to discharge the treated metal sulfate solution, stirring equipment that mixes the electrolyte bath, a temperature control system, and a rectifier that supplies current at constant voltage between the anode and cathode electrode.

Provided is an operation support apparatus comprising: a production efficiency acquisition unit which acquires production efficiency of an electrolysis tank; a determination unit which determines whether the production efficiency of the electrolysis tank acquired by the production efficiency acquisition unit is below a predetermined production efficiency threshold value; and an identification unit which identifies, if it is determined by the determination unit that the production efficiency of the electrolysis tank is below the production efficiency threshold value, a first factor for which the production efficiency of the electrolysis tank has fallen below the production efficiency threshold value.

Provided is an operation support apparatus comprising: a production efficiency acquisition unit which acquires production efficiency of an electrolysis tank; a determination unit which determines whether the production efficiency of the electrolysis tank acquired by the production efficiency acquisition unit is below a predetermined production efficiency threshold value; and an identification unit which identifies, if it is determined by the determination unit that the production efficiency of the electrolysis tank is below the production efficiency threshold value, a first factor for which the production efficiency of the electrolysis tank has fallen below the production efficiency threshold value.

A water electrolysis system includes a pair of electrolytic cells for accommodating electrolytic water supplied from an electrolytic water tank and connected to a hydrogen tank and an oxygen tank, a pair of active electrodes including a cathode and an anode being accommodated in the electrolytic cells and connected to electric power by an active electrode lead to electrolyze electrolytic water to produce hydrogen and oxygen, auxiliary electrodes accommodated in the electrolytic cells and connected by an auxiliary electrode lead to provide electrons to the separated electrolytic cells or receive electrons therefrom, sensors for measuring pressure of hydrogen or oxygen generated in the electrolytic cells and measure electrolytic water capacity of the electrolytic cells, and a controller for selectively discharging a hydrogen or oxygen gas upon receiving a measurement value of a sensor, selectively supplying electrolytic water to the electrolytic cells from the electrolytic water tank, and selectively controlling a current direction of the electric power.

A method of recovering performance of a water electrolysis system is a method of recovering performance of a water electrolysis system which includes a water electrolysis stack having a solid polymer membrane, a positive electrode, and a negative electrode, the method including the steps of: bringing an operating state of the water electrolysis system into a state of low-temperature operation in which a temperature of water is lower than a temperature of water during ordinary operation in which water electrolysis is carried out by the water electrolysis stack; and in the state of the low-temperature operation, passing an electric current through each of the positive electrode and the negative electrode.

A method of recovering performance of a water electrolysis system is a method of recovering performance of a water electrolysis system which includes a water electrolysis stack having a solid polymer membrane, a positive electrode, and a negative electrode, the method including the steps of: bringing an operating state of the water electrolysis system into a state of low-temperature operation in which a temperature of water is lower than a temperature of water during ordinary operation in which water electrolysis is carried out by the water electrolysis stack; and in the state of the low-temperature operation, passing an electric current through each of the positive electrode and the negative electrode.

A water electrolyzer includes an electrochemical cell including an anode and a cathode, an electrolyte solution, a heater, a voltage applicator, and a controller. The heater heats the electrolyte solution. The voltage applicator applies a voltage between the anode and the cathode. The electrochemical cell includes nickel. In startup of the water electrolyzer, the controller causes the heater to increase the temperature of the electrolyte solution by heating and causes the voltage applicator to start application of a voltage when the temperature of the electrolyte solution is less than a predetermined threshold value.

A water electrolyzer includes an electrochemical cell including an anode and a cathode, an electrolyte solution, a heater, a voltage applicator, and a controller. The heater heats the electrolyte solution. The voltage applicator applies a voltage between the anode and the cathode. The electrochemical cell includes nickel. In startup of the water electrolyzer, the controller causes the heater to increase the temperature of the electrolyte solution by heating and causes the voltage applicator to start application of a voltage when the temperature of the electrolyte solution is less than a predetermined threshold value.