Biotemplating of Al2O3-Doped, CaO-Based Material from Bamboo Fiber for Efficient Solar Energy Storage
Biotemplating of Al2O3-Doped, CaO-Based Material from Bamboo Fiber for Efficient Solar Energy Storage
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DOI：
10.3390/pr11020460
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发表时间：
2023-02
期刊：
影响因子：
3.5
通讯作者：
Haoran Zhang;Xiaotong Ma;Xingkang Huang;Fei Li;J. Li;Xiu-de Hu;Cuiping Wang
中科院分区：
文献类型：
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作者：
Haoran Zhang;Xiaotong Ma;Xingkang Huang;Fei Li;J. Li;Xiu-de Hu;Cuiping Wang
cao基材料的高温烧结导致其在煅烧/碳化循环过程中的储能性能严重衰减。为了克服多孔性损失问题，以竹纤维为生物模板，合成了一种高效的储热材料。在循环煅烧/碳化实验的基础上，优化了竹纤维添加、热解、Al2O3加载等合成参数和曹基储能材料的储能反应特性。结果表明，牺牲的生物模板提高了合成材料的孔隙率，表明储能密度提高。经50次循环后，模板材料的累计储能密度比石灰石高24131.44 kJ/kg。掺5wt .% Al2O3和0.5 g竹纤维的模板化cao基材料经过10次循环后碳化转化密度和储能密度分别达到0.75 mol/mol和2368.82 kJ/kg，是原石灰石的2.7倍。与石灰石相比，模板化后的草基材料在第一个循环中的最大表观碳化率增加了240%。与初始循环相比，第12个循环合成的cao基材料的最大煅烧率保持在93%。微观结构分析表明，循环过程中层次稳定的结构有利于CaO表面活性位点的更有效暴露和CO2分子通过CaO向内/向外扩散。使用牺牲生物模板的方法为制备多孔材料提供了一种先进的方法，而复合钙基材料提供了高回报的太阳能储能，具有工业规模应用的潜力。
The high-temperature sintering of CaO-based materials leads to the serious decay of energy storage performance during the calcination/carbonation cycle. To overcome the loss in porosity problem, an efficient CaO-based material for thermal energy storage was synthesized using bamboo fiber as the biotemplate. The synthesis parameters (bamboo fiber addition, pyrolysis, Al2O3 loading) and the energy storage reaction characteristics of CaO-based energy storage material were optimized on the basis of cyclic calcination/carbonation experiments. The results show that the sacrificed biotemplate enhances the porosity of the synthetic material, denoting improved energy storage density. The cumulative energy storage density of the templated material over 50 cycles is 24,131.44 kJ/kg higher than that of limestone. The carbonation conversion and energy storage density of the templated CaO-based material doped with 5 wt.% Al2O3 and 0.5 g bamboo fiber reach 0.75 mol/mol and 2368.82 kJ/kg after 10 cycles, respectively, which is 2.7 times as high as that of original limestone. The maximum apparent carbonation rate of the templated CaO-based materials in the 1st cycle corresponds to a 240% increment compared to limestone. The maximum calcination rate of the synthetic CaO-based material in the 12th cycle remains 93%, as compared with the initial cycle. The microstructure analysis reveals that the hierarchically-stable structure during the cycle is beneficial for a more effective exposure of surface reactive sites for CaO and inward/outward diffusion for CO2 molecules through CaO. The method using the sacrificed biological template provides an advanced approach to fabricate porous materials, and the composite CaO-based material provides high-return solar energy storage for a potential application in industrial scale.