Caesium doping accelerates the hydration rate of potassium carbonate in thermal energy storage

Potassium carbonate has recently been identified as a promising candidate for thermochemical energy storage. However, many salt hydrates, its reaction kinetics is relatively slow. K2CO3 metastable zone, where the kinetically hindered, which limits temperature operating window. This work aims to improve material performance, focusing on two aspects; improving outside zone and reducing width. shows that doping with Cs2CO3, can both. Moreover, it shown dopant enhances hydration rate by introducing mobility due local deliquescence. lays foundation further research using dopants enhance performance of hydrates.