Investigating the effects of ZnO dopant on the thermodynamic and kinetic properties of CaCO3/CaO TCES system
Investigating the effects of ZnO dopant on the thermodynamic and kinetic properties of CaCO3/CaO TCES system
复制标题
研究ZnO掺杂剂对CaCO3/CaO TCES体系热力学和动力学性质的影响
DOI：
10.1016/j.energy.2020.119132
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发表时间：
2021-01-15
期刊：
影响因子：
9
通讯作者：
Zhao, C. Y.
中科院分区：
文献类型：
--
作者：
Khosa, Azhar Abbas;Yan, J.;Zhao, C. Y.
CaCO 3/CaO基热化学储能系统在聚光太阳能发电中具有很好的应用前景。然而，CaCO 3/CaO体系的低反应活性和烧结性限制了该体系的储能/释能性能。在这项工作中，我们报告ZnO作为一种新的掺杂材料的CaCO 3/CaO TCES系统。我们测试了不同的ZnO负载量，并确定了最佳性能的最佳负载量。详细介绍了在脱碳酸步骤中的掺杂以及未掺杂的系统的反应动力学。此外，能量存储容量和循环稳定性超过前100个周期的报告。结果表明，在最佳负载量下，ZnO掺杂CaCO 3的吸收能量为1478.8J/g。ZnO掺杂体系的循环转化率在20次循环后稳定，这是对未掺杂体系的改进，未掺杂体系甚至在100次循环后也显示出缓慢但稳定的下降。ZnO似乎是一种可行的掺杂材料，考虑到其低成本和可用性，可以导致改进的热化学储能系统。(c)2020爱思唯尔有限公司保留所有权利。
CaCO3/CaO based thermochemical energy storage system has a promising potential for the concentrated solar power plants. However, the low reactivity and sintering of CaCO3/CaO restricts the energy storage/release performance of this system. In this work, we report ZnO as a new doping material for the CaCO3/CaO TCES system. We tested different loadings of ZnO and determined an optimal loading for the best performance. The reaction kinetics of both the doped as well as the undoped system in the decarbonation step is presented in detail. Furthermore, the energy storage capacity and the cyclic stability over first 100 cycles is reported. It is found that the ZnO-doped CaCO3 can absorb 1478.8 J/g energy at the optimal loading. The cyclic conversion of the ZnO-doped system stabilizes after 20 cycles, which is an improvement from the undoped system that shows a slow but steady decline even after 100 cycles. ZnO seems to be a viable doping material, which considering its low cost and availability can lead to an improved thermochemical energy storage system. (c) 2020 Elsevier Ltd. All rights reserved.