TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred System: In the controlled electrolysis system, the nano-metal particles comprise at least one of nano-nickel, nano-iron, or nano-nickel-iron alloy particles. The magnetic element comprises a cylindrical body and a sleeve with an annulus sized to receive the cylindrical body comprises the conductive body portion and an insulated body portion. The magnetic element is movable within the insulated body portion of the sleeve to control the strength of the magnetic field at the conductive body portion. The system further comprises a gas seal surrounding the sleeve, a first electrode and electrolyte, and a gas outlet extending through the seal. The magnetic element is an electro-magnet and the strength of the magnetic field at least partially encompassing the conductive portion is controlled by control of electrical power to the electro-magnet. The first electrode comprises zinc or a zinc coated metal. The nano-metal particles comprise at least one of nano-nickel, nano-iron, or nano-nickel-iron alloy particles. In the system for controlled generation of hydrogen gas, the nano-metal particles comprise at least one of nano-nickel, nano-iron, or nano-nickel-iron alloy. The first electrode comprises zinc or a zinc coated metal. The magnetic element comprises a cylindrical body and the hollow body comprises a sleeve with an annulus sized to receive the cylindrical body. The magnetic element is movable within the insulated portion of the hollow body to control the influence of the magnetic field on the conductive portion. The system further comprises a cell containing the first electrode and the electrolyte, the cell gas-sealed and having an outlet port for removal of produced hydrogen gas. The first electrode comprises zinc or a zinc coated metal. The magnetic element is at least one electro-magnet. In the system for controlled generation of hydrogen gas, the magnetic element is movable within the hollow body to control the strength of the magnetic field to control a rate of hydrogen production. The magnetic element is an electro-magnet with variable magnetic field strength to control a rate of hydrogen production.