Sulfur–iodine cycle

The three reactions combined to produce hydrogen are the following: The sulfur and iodine compounds are recovered and reused, hence the consideration of the process as a cycle.

Plans have been made to test larger-scale automated systems for hydrogen production.

Under an International Nuclear Energy Research Initiative (INERI) agreement, the French CEA, General Atomics and Sandia National Laboratories are jointly developing the sulfur-iodine process.

Additional research is taking place at the Idaho National Laboratory, and in Canada, Korea and Italy.

[6][7] Some materials suggested include tantalum alloys, niobium alloys, noble metals, high-silicon steels,[8] several nickel-based superalloys, mullite, silicon carbide (SiC), glass, silicon nitride (Si3N4), and others.