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Facile Synthesis of [email protected]2O3 Microcapsule for High-Temperature Thermal Energy Storage
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-08-29 00:00:00 , DOI: 10.1021/acssuschemeng.8b02840 Kongzhai Li 1, 2, 3 , Zhenhua Gu 2 , Xing Zhu 1, 4 , Yonggang Wei 1 , Hua Wang 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-08-29 00:00:00 , DOI: 10.1021/acssuschemeng.8b02840 Kongzhai Li 1, 2, 3 , Zhenhua Gu 2 , Xing Zhu 1, 4 , Yonggang Wei 1 , Hua Wang 1, 2
Affiliation
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Preparation of high-temperature encapsulated phase change materials (PCMs) is very challengeable due to the high chemical corrosion of liquid metal and the high thermal stress caused by volume expansion. We herein report a novel strategy for preparing high-temperature [email protected]2O3 PCM. In this method, nano Ni species are loaded on the surface of Al spheres, which could accelerate the oxidation of the surface Al layer during calcination in air. By monitoring the oxygen consumption and the exothermic changes during the oxidation process, it is found that the oxidation of Al follows a stepwise process which results in the formation of a layered Al2O3 shell. The high oxygen consumption and relatively low activation energy (149–156 kJ/mol) suggests that the surface nickel species significantly accelerate the low-temperature (<650 °C) oxidation of aluminum. The [email protected]2O3 composites show a well-formed core–shell structure with 60–68 wt % of core fraction, high latent heat (289–312 J/g), and mitigated supercooling performance. The layered structure of the shell and the presence of voids in the core together strongly improve the elasticity of the core–shell structure by tuning the thermal stress resulting from the volumetric expansion of the Al core during melting, obtaining a very high stability in long-term melting–freezing cycles.
中文翻译：
[电子邮件保护的] 2 O 3微胶囊的简便合成，用于高温热能存储
由于液态金属的高度化学腐蚀和体积膨胀引起的高热应力，高温封装相变材料（PCM）的制备非常具有挑战性。我们在此报告了一种制备高温[受电子邮件保护的] 2 O 3 PCM的新颖策略。在这种方法中，纳米Ni物质负载在Al球的表面上，这可能会加速在空气中煅烧过程中表面Al层的氧化。通过监测氧化过程中的氧气消耗和放热变化，发现Al的氧化遵循逐步过程，导致形成层状Al 2 O 3。壳。高耗氧量和相对较低的活化能（149–156 kJ / mol）表明表面镍物种显着促进了铝的低温（<650°C）氧化。受[电子邮件保护]的2 O 3复合材料表现出良好的核-壳结构，其核分数为60-68 wt％，潜热较高（289-312 J / g），并且过冷性能降低。壳的分层结构和芯中存在的空隙一起，通过调节熔化过程中铝芯体积膨胀产生的热应力，极大地提高了芯-壳结构的弹性，从而获得了很高的长期稳定性。术语“融化-冷冻”循环。
更新日期：2018-08-29
中文翻译：
[电子邮件保护的] 2 O 3微胶囊的简便合成，用于高温热能存储
由于液态金属的高度化学腐蚀和体积膨胀引起的高热应力，高温封装相变材料（PCM）的制备非常具有挑战性。我们在此报告了一种制备高温[受电子邮件保护的] 2 O 3 PCM的新颖策略。在这种方法中，纳米Ni物质负载在Al球的表面上，这可能会加速在空气中煅烧过程中表面Al层的氧化。通过监测氧化过程中的氧气消耗和放热变化，发现Al的氧化遵循逐步过程，导致形成层状Al 2 O 3。壳。高耗氧量和相对较低的活化能（149–156 kJ / mol）表明表面镍物种显着促进了铝的低温（<650°C）氧化。受[电子邮件保护]的2 O 3复合材料表现出良好的核-壳结构，其核分数为60-68 wt％，潜热较高（289-312 J / g），并且过冷性能降低。壳的分层结构和芯中存在的空隙一起，通过调节熔化过程中铝芯体积膨胀产生的热应力，极大地提高了芯-壳结构的弹性，从而获得了很高的长期稳定性。术语“融化-冷冻”循环。
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