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Giant electrocaloric effect in a molecular ceramic
Materials Horizons ( IF 12.2 ) Pub Date : 2022-12-22 , DOI: 10.1039/d2mh01296k
Hao-Ran Ji 1 , Ru-Jie Zhou 1 , Jie Yao 1 , Xiao-Xing Cao 1 , Zheng-Yin Jing 1 , Qiang Pan 1 , Zi-Jie Feng 1 , Zhu-Xiao Gu 1, 2 , Yu-Meng You 1
Materials Horizons ( IF 12.2 ) Pub Date : 2022-12-22 , DOI: 10.1039/d2mh01296k
Hao-Ran Ji 1 , Ru-Jie Zhou 1 , Jie Yao 1 , Xiao-Xing Cao 1 , Zheng-Yin Jing 1 , Qiang Pan 1 , Zi-Jie Feng 1 , Zhu-Xiao Gu 1, 2 , Yu-Meng You 1
Affiliation
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The electrocaloric effect (ECE) is an efficient and environmentally friendly method for solid-state refrigeration driven by an electric field. However, disregarding the ECE performance, the mass of materials also limits the amount of energy transferred in the cooling process. While molecular ECE materials have been attracting intensive attention with their excellent ECE properties, most reported molecular compounds can only be utilized in the form of thin films or single crystals. Unlike inorganic ceramics, molecular thin films and single crystals are very difficult to prepare in a large amount, which greatly restrains the future application of those materials. In this work, we report an excellent molecular ECE material in the form of polycrystalline molecular ceramics. Such molecular ceramics are composed of plastic molecular ferroelectrics, and can fulfil the requirement of large mass, easy processing, excellent performance and low energy consumption. Our molecular ceramic of HQReO4 (HQ: protonated quinuclidine) demonstrates an isothermal entropy change of 5.8 J K−1 kg−1 and an adiabatic temperature change of 3.1 K. Notably, by a simple low-temperature pressing process without added adhesives (about 373 K), an HQReO4 molecular ceramic block can be obtained, and its ECE performance is observed to be comparable to that of single crystals, for the first time. This work proposes a new application form for molecular electrocaloric materials, which opens up new ideas for solid-state refrigeration.
中文翻译：
分子陶瓷中的巨大电热效应
电热效应 (ECE) 是一种高效且环保的电场驱动固态制冷方法。然而，不考虑 ECE 性能，材料的质量也限制了冷却过程中传递的能量。虽然分子 ECE 材料以其优异的 ECE 性能引起了人们的广泛关注，但大多数报道的分子化合物只能以薄膜或单晶的形式使用。与无机陶瓷不同，分子薄膜和单晶很难大量制备，这极大地制约了这些材料未来的应用。在这项工作中，我们以多晶分子陶瓷的形式报告了一种优秀的分子 ECE 材料。这种分子陶瓷由塑料分子铁电体组成，可满足质量大、易加工、性能优良、能耗低的要求。我们的 HQReO 分子陶瓷图 4 （HQ：质子化奎宁环）显示出 5.8 JK -1 kg -1的等温熵变和 3.1 K 的绝热温度变化。值得注意的是，通过不添加粘合剂的简单低温压制工艺（约 373 K），HQReO可以获得4分子陶瓷块，其ECE性能首次被观察到可与单晶相媲美。该工作为分子电热材料提出了一种新的应用形式，为固态制冷开辟了新思路。
更新日期：2022-12-22
中文翻译：
分子陶瓷中的巨大电热效应
电热效应 (ECE) 是一种高效且环保的电场驱动固态制冷方法。然而，不考虑 ECE 性能，材料的质量也限制了冷却过程中传递的能量。虽然分子 ECE 材料以其优异的 ECE 性能引起了人们的广泛关注，但大多数报道的分子化合物只能以薄膜或单晶的形式使用。与无机陶瓷不同，分子薄膜和单晶很难大量制备，这极大地制约了这些材料未来的应用。在这项工作中，我们以多晶分子陶瓷的形式报告了一种优秀的分子 ECE 材料。这种分子陶瓷由塑料分子铁电体组成，可满足质量大、易加工、性能优良、能耗低的要求。我们的 HQReO 分子陶瓷图 4 （HQ：质子化奎宁环）显示出 5.8 JK -1 kg -1的等温熵变和 3.1 K 的绝热温度变化。值得注意的是，通过不添加粘合剂的简单低温压制工艺（约 373 K），HQReO可以获得4分子陶瓷块，其ECE性能首次被观察到可与单晶相媲美。该工作为分子电热材料提出了一种新的应用形式，为固态制冷开辟了新思路。
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