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  • Notable hydrogen production on LaxCa1-xCoO3 perovskites via two-step thermochemical water splitting

    Author(s)
    Wang, Lulu
    Al-Mamun, Mohammad
    Liu, Porun
    Wang, Yun
    Yang, Hua Gui
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Liu, Porun
    Wang, Yun
    Year published
    2018
    Metadata
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    Abstract
    High-performance thermochemical water splitting catalyst is the key in solar-driven H2 production for the development of sustainable and clean energy technology. Perovskite oxides have been considered promising redox catalysts for two-step thermochemical H2O splitting cycles due to their remarkable oxygen exchange capacity at low thermal heating temperatures. This study is the first to investigate perovskite series of La1−xCa x CoO3 for two-step thermochemical H2O splitting cycles. The Ca doping contents in La1−xCa x CoO3 perovskites showed a significant effect on the O2 and H2 production performances. Increasing the Ca ...
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    High-performance thermochemical water splitting catalyst is the key in solar-driven H2 production for the development of sustainable and clean energy technology. Perovskite oxides have been considered promising redox catalysts for two-step thermochemical H2O splitting cycles due to their remarkable oxygen exchange capacity at low thermal heating temperatures. This study is the first to investigate perovskite series of La1−xCa x CoO3 for two-step thermochemical H2O splitting cycles. The Ca doping contents in La1−xCa x CoO3 perovskites showed a significant effect on the O2 and H2 production performances. Increasing the Ca doping content has greatly increased O2 evolution during the thermal reduction process. However, high Ca dopant content significantly weakened the reaction thermodynamics of the subsequent H2O splitting and led to lower re-oxidation yields. After tuning the Ca doping level from 0.2 to 0.8, La0.6Ca0.4CoO3 was identified as the best trade-off among the tested La1−xCa x CoO3 perovskites. The thermal reduction and water splitting temperatures were also systematically investigated to optimize the thermochemical operational conditions. La0.6Ca0.4CoO3 showed maximum H2 production of 587 µmol g−1 when the two-step thermochemical H2O splitting carried out between 1300 and 900 °C, eighteen times higher than that of CeO2 under the same experimental condition. More importantly, La0.6Ca0.4CoO3 also exhibited fairly good catalytic stability during the thermochemical cycling test and has strong potential for long-term applications.
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    Journal Title
    Journal of Materials Science
    Volume
    53
    DOI
    https://doi.org/10.1007/s10853-018-2004-2
    Subject
    Chemical sciences
    Other chemical sciences not elsewhere classified
    Engineering
    Publication URI
    http://hdl.handle.net/10072/370282
    Collection
    • Journal articles

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