Low pressure reversibly driving colossal barocaloric effect in two-dimensional vdW alkylammonium halides

Yi-Hong Gao, Dong-Hui Wang, Feng-Xia Hu (), Qing-Zhen Huang, You-Ting Song, Shuai-Kang Yuan, Zheng-Ying Tian, Bing-Jie Wang, Zi-Bing Yu, Hou-Bo Zhou, Yue Kan, Yuan Lin, Jing Wang (), Yun-liang Li (), Ying Liu, Yun-Zhong Chen, Ji-Rong Sun, Tong-Yun Zhao and Bao-Gen Shen ()
Additional contact information
Yi-Hong Gao: Chinese Academy of Sciences
Dong-Hui Wang: Beijing Normal University
Feng-Xia Hu: Chinese Academy of Sciences
Qing-Zhen Huang: Chinese Academy of Sciences
You-Ting Song: Chinese Academy of Sciences
Shuai-Kang Yuan: Chinese Academy of Sciences
Zheng-Ying Tian: Chinese Academy of Sciences
Bing-Jie Wang: Chinese Academy of Sciences
Zi-Bing Yu: Chinese Academy of Sciences
Hou-Bo Zhou: Chinese Academy of Sciences
Yue Kan: Chinese Academy of Sciences
Yuan Lin: Chinese Academy of Sciences
Jing Wang: Chinese Academy of Sciences
Yun-liang Li: Chinese Academy of Sciences
Ying Liu: Beijing Normal University
Yun-Zhong Chen: Chinese Academy of Sciences
Ji-Rong Sun: Chinese Academy of Sciences
Tong-Yun Zhao: Chinese Academy of Sciences
Bao-Gen Shen: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Plastic crystals as barocaloric materials exhibit the large entropy change rivalling freon, however, the limited pressure-sensitivity and large hysteresis of phase transition hinder the colossal barocaloric effect accomplished reversibly at low pressure. Here we report reversible colossal barocaloric effect at low pressure in two-dimensional van-der-Waals alkylammonium halides. Via introducing long carbon chains in ammonium halide plastic crystals, two-dimensional structure forms in (CH3–(CH2)n-1)2NH2X (X: halogen element) with weak interlayer van-der-Waals force, which dictates interlayer expansion as large as 13% and consequently volume change as much as 12% during phase transition. Such anisotropic expansion provides sufficient space for carbon chains to undergo dramatic conformation disordering, which induces colossal entropy change with large pressure-sensitivity and small hysteresis. The record reversible colossal barocaloric effect with entropy change ΔSr ~ 400 J kg−1 K−1 at 0.08 GPa and adiabatic temperature change ΔTr ~ 11 K at 0.1 GPa highlights the design of novel barocaloric materials by engineering the dimensionality of plastic crystals.

Date: 2024
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DOI: 10.1038/s41467-024-46248-1

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