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

Author:

Gao Yi-Hong,Wang Dong-Hui,Hu Feng-XiaORCID,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 JingORCID,Li Yun-liangORCID,Liu Ying,Chen Yun-ZhongORCID,Sun Ji-RongORCID,Zhao Tong-Yun,Shen Bao-Gen

Abstract

AbstractPlastic 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.

Publisher

Springer Science and Business Media LLC

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Colossal barocaloric effect of phase-change fatty acids;Applied Physics Letters;2024-08-05

2. Landau theory of barocaloric plastic crystals;Journal of Physics: Energy;2024-06-20

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