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

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 spac

SUBMITTER: Gao YH 

PROVIDER: S-EPMC10901796 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature