Abstract :
The water splitting reaction by a thermo-chemical cycle using ferrites was investigated for H2 production. In the first step (activation
step), ferrites were thermally reduced at 1200 C to form an oxygen-deficient ferrite. In the second step (water splitting step), the activated
ferrites were oxidized by water at 800 C to produce hydrogen. Among the prepared ferrites, Ni-ferrite was found to be the most suitable
for H2 production. NiFe2O4 produced an average of 0.442 cm3/g cycle of H2. The H2 productivity of the Ni-ferrite was much higher than
that of the other ferrites at the same temperature. XRD showed that the crystal structure of NiFe2O4 during the redox reaction was not
changed during the repeated cycles, indicating that NiFe2O4 was an excellent material in terms of structural stability and durability.
2006 Elsevier Ltd. All rights reserved
