Xu Haojie, Guo Wuqian, Ma Yu, Liu Yi, Hu Xinxin, Hua Lina, Han Shiguo, Liu Xitao, Luo Junhua, Sun Zhihua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, People's Republic of China.
University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100039, Beijing, People's Republic of China.
Nat Commun. 2022 Sep 10;13(1):5329. doi: 10.1038/s41467-022-33039-9.
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 CMBrI and CMBrCl 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/cm, 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.
无金属反铁电材料因其具有可穿戴性、环境友好性和结构可调性等独特优点，在能量存储应用方面颇具前景。尽管受到了广泛关注，但无金属反铁电体数量相当有限，获取新型软反铁电候选材料仍是一项挑战。在此，我们成功开发出二元CMBrI和CMBrCl固溶体单晶（0 ≤ x ≤ 1，其中CM为环己基甲基铵）。分子水平的修饰可有效提高居里温度。重点在于，二元CM - 氯化物盐在已知分子反铁电体中展现出高达约453 K的最高反铁电 - 顺电居里温度。其独特的双电滞回线提供了高达约11.4 μC/cm²的大极化强度，赋予了显著的能量存储行为。据我们所知，这项工作为面向生物相容性储能器件的新型无金属反铁电候选材料的靶向设计提供了一种有效的固溶体方法。
