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Gao, Yi-Hong; Wang, Dong-Hui; Hu, Feng-Xia; Huang, Qing-Zhen; Song, You-Ting; Yuan, Shuai-Kang; Tian, Zheng-Ying; Wang, Bing-Jie; Yu, Zi-Bing; Zhou, Hou-Bo; Kan, Yue; Lin, Yuan; Wang, Jing; Li, Yun-Liang; Liu, Ying; Chen, Yun-Zhong; Sun, Ji-Rong; Zhao, Tong-Yun; Shen, Bao-Gen
Nature communications, 02/2024, Letnik: 15, Številka: 1Journal Article
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 (CH -(CH ) ) NH X (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 ΔS ~ 400 J kg K at 0.08 GPa and adiabatic temperature change ΔT ~ 11 K at 0.1 GPa highlights the design of novel barocaloric materials by engineering the dimensionality of plastic crystals.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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