Thermodynamic investigation of the possibility of using uranium dioxide to obtain hydrogen and oxygen from water

The equilibrium composition in the system U-O-H at temperatures 300-3000 K is calculated using thermodynamic functions. It is shown that the decomposition of water in H 2 and O 2 can be achieved in steps: first with only hydrogen being released at 1200-1500 K and then only oxygen at 2100-2500 K. When uranium dioxide interacts with water, mainly two uranium oxides are formed - U 4 O 9 and UO 3 ; nine gaseous components can have appreciable partial pressure: UO, UO 2 , UO 3 , UO 2 (OH) 2 , H 2 O, H 2 , H, OH, HO 2 .