Cu/Ca-based thermochemical energy storage presents a novel hydrogen storage method that effectively addresses excess power consumption.However,the effectiveness of Cu/Ca composites in carbonation decreases significantly after multiple cycles,limiting their practical use.To address this issue,we employed a stabilizer modification method to improve the performance of Cu/Ca composites.First,Cu/Ca composites were prepared using the Pechini method and stabilized with different stabilizers,then evaluated in a triple-packed-bed reactor.Experimental results showed that composites modified with stabilizers maintained excellent oxidation properties over 10 cycles,with oxidation conversions consistently above 90％.Among the stabilizers tested,Y2O3 significantly improved the carbonation conversion of the composites compared to CeO2 and MgO.Specifically,the 5Y-Cu-Ca composite,with a Y2O3/CaO/CuO molar ratio of 5∶47.5∶47.5,displayed an initial carbonation conversion of 74.6％,which decreased to 54.1％after 10 cycles.To further improve the carbonation performance of Y2O3-stabilized Cu/Ca composites,we adopted a dual-stabilization strategy by incorporating ZrO2 as a second carrier and co-doping it with Y2O3.The most effective Y2O3/ZrO2-stabilized Cu/Ca composites,with a molar ratio of 2∶1,achieved an initial carbonation conversion of 81.6％,dropping to 70.5％after 10 cycles,retaining 86％of its initial activity.In summary,the Cu/Ca composites developed in this study hold great potential for the practical application of Cu/Ca-based thermochemical energy storage technology.
关键词
储能/化学反应/化学链/载体
Key words
energy storage/chemical reaction/chemical looping/stabilizer
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