Investigation on Synthesis of CeO2-stabilized CaO/CuO Composite Nanospheres and Their Thermochemical Energy Storage Characteristics
An integrated Ca/Cu looping thermochemical heat storage process was proposed,employing cyclic calci-nation/reduction-oxidation-carbonation reactions of CaO/CuO composite materials for hydrogen energy storage.In the energy storage stage,the calcination/reduction reaction occurred between hydrogen and CaO/CuO composite materials,storing hydrogen energy as the thermochemical energy of these materials.In the subsequent energy re-lease stage,the CaO/CuO composite materials underwent oxidation and carbonation reactions stepwise with air and CO2,releasing the previously stored thermochemical energy as heat.For the CaO/CuO composite materials in the proposed process,a two-step synthesis method was used to prepare CeO2-stabilized CaO/CuO composite nanosph-eres.The effect of CeO2 content on the CaO/CuO composite pellets was studied in a fixed-bed reactor.The results show that all of the CeO2-stabilized CaO/CuO composite nanospheres exhibited stable oxidation performance over ten cycles.However,the CeO2 content had a significant impact on the carbonation performance of CeO2-stabilized CaO/CuO composite nanospheres.With an increase in the CeO2 content from 20％to 60％,the initial carbonation performance of CaO/CuO composite nanospheres decreased significantly from 0.092 g/g to 0.017 g/g.
energy storagechemical loopingcomposite materialstabilizer
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