Record high-Tc and large practical utilization level of electric polarization in metal-free molecular antiferroelectric solid solutions

Haojie Xu, Wuqian Guo, Yu Ma, Yi Liu, Xinxin Hu, Lina Hua, Shiguo Han, Xitao Liu, Junhua Luo () and Zhihua Sun ()
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Haojie Xu: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Wuqian Guo: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Yu Ma: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Yi Liu: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Xinxin Hu: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Lina Hua: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Shiguo Han: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Xitao Liu: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Junhua Luo: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Zhihua Sun: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Metal-free antiferroelectric materials are holding a promise for energy storage application, owing to their unique merits of wearability, environmental friendliness, and structure tunability. Despite receiving great interests, metal-free antiferroelectrics are quite limited and it is a challenge to acquire new soft antiferroelectric candidates. Here, we have successfully exploited binary CMBrxI1-x and CMBrxCl1-x solid solution as single crystals (0 ≤ x ≤ 1, where CM is cyclohexylmethylammonium). A molecule-level modification can effectively enhance Curie temperature. Emphatically, the binary CM-chloride salt shows the highest antiferroelectric-to-paraelectric Curie temperature of ~453 K among the known molecular antiferroelectrics. Its characteristic double electrical hysteresis loops provide a large electric polarization up to ~11.4 μC/cm2, which endows notable energy storage behaviors. To our best knowledge, this work provides an effective solid-solution methodology to the targeted design of new metal-free antiferroelectric candidates toward biocompatible energy storage devices.

Date: 2022
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DOI: 10.1038/s41467-022-33039-9

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