Abstract
High-purity hydrogen production via water splitting over BaFeO3-δ (BF)-based perovskites was studied, where reduction/oxidation temperatures were paired at 500/500, 700/700 and 900/900 °C. Ba0.95La0.05FeO3-δ (BLF) yielded the highest H2production, ca.1310 μmol/g at 900 °C. Adding either La or Gd into BF established a cubic phase structure, allowing a higher concentration of oxygen deficiencies. Sintering was observed over all catalysts, which became more obvious when the oxidation temperature and number of cycles were increased. The apparent activation energy and pre-exponential factor for BLF oxidation in the presence of H2O were estimated to be 47.4 kJ/mol and 0.18 s−1, respectively.
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