Enhancement of O2-releasing step with Fe2O3 in the water splitting by MnFe2O4–Na2CO3 system

Abstract In the O 2 -releasing step of water splitting system, MnFe 2 O 4 was completely regenerated from Na(Mn 1/3 Fe 2/3 )O 2+ δ by enhancement of O 2 -releasing step with Fe 2 O 3 at 1273 K. Thermodynamic data for the enhancement of the O 2 -releasing step with α -Fe 2 O 3 in the water splitting with the MnFe 2 O 4 –Na 2 CO 3 system are experimentally confirmed. The amount of released oxygen attained to the theoretical value at around 1273 K (P O 2 =10 −6 ) and about 1240 K (P O 2 =10 −7 ). At higher temperature above 1273 K (P O 2 =10 −6 ) and 1240 K (P O 2 =10 −7 ), the released oxygen amount increased. In the three-step water splitting system with MnFe 2 O 4 –Na 2 CO 3 –Fe 2 O 3 , we proposed that there are some advantages required for application to the solar thermochemical process.