Aarts Joey, Mazur Natalia, Fischer Hartmut R, Adan Olaf C G, Huinink Henk P
Eindhoven Institute of Renewable Energy Systems, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands.
Transport in Permeable Media group, Department of Applied Physics, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands.
Cryst Growth Des. 2024 Mar 4;24(6):2493-2504. doi: 10.1021/acs.cgd.3c01484. eCollection 2024 Mar 20.
Potassium carbonate sesquihydrate has previously been identified as a promising material for thermochemical energy storage. The hydration and cyclic behavior have been extensively studied in the literature, but detailed investigation into the different processes occurring during dehydration is lacking. In this work, a systematic investigation into the different dehydration steps is conducted. It is found that at higher temperatures, dehydration of pristine material occurs as a single process since water removal from the pristine crystals is difficult. After a single cycle, due to morphological changes, dehydration now occurs as two processes, starting at lower temperatures. The morphological changes open new pathways for water removal at the newly generated edges, corners, and steps of the crystal surface. The observations from this work may contribute to material design as they elucidate the relation between material structure and behavior.
碳酸钾倍半水合物此前已被确定为一种很有前景的热化学储能材料。文献中对其水合和循环行为进行了广泛研究，但缺乏对脱水过程中发生的不同过程的详细研究。在这项工作中，对不同的脱水步骤进行了系统研究。研究发现，在较高温度下，原始材料的脱水是一个单一过程，因为从原始晶体中去除水分很困难。经过一个循环后，由于形态变化，脱水现在以两个过程发生，且始于较低温度。形态变化为在晶体表面新产生的边缘、角和台阶处的水分去除开辟了新途径。这项工作的观察结果可能有助于材料设计，因为它们阐明了材料结构与行为之间的关系。
