Thermochemical heat storage ability of <scp> ZnSO <sub>4</sub> </scp> · <scp> 7H <sub>2</sub> O </scp> as potential long‐term heat storage material
Ata Ur Rehman, Muhammad Zahir Shah, Aamir Ali, Tianyu Zhao, Rahim Shah, Ihsan Ullah, Hazrat Bilal, Ahsan Riaz Khan, Muhammad Iqbal, Asif Hayat, Maosheng Zheng
Abstract
ZnSO4·7H2O is a promising thermochemical heat storage material. In this paper, we report a detailed thermodynamic study of ZnSO4·7H2O based on hydration/dehydration, cyclicability, and water sorption performance. The TG-DSC measurements reported that at below 120°C, 1747 and 1298 J g−1enthalpy was recorded for dehydration and hydration, respectively. The relative-humidity study showed that at 75% RH (0.148 g/g), the water sorption can be significantly improved compared to lower humidity (65% 0.131). The XRD study highlighted that the main structure of ZnSO4 after thermal treatment remains unchanged.