Experimental investigation of specific heat and thermal stability of MOF-303 at different water vapor loading and various temperatures

Measuring the specific heat capacity (Cp) of materials is essential for optimizing thermal management in various applications. Cp directly influences the heat storage and heat transfer performance of materials. Despite the widespread study of Metal Organic Frameworks (MOFs), the Cp of MOF-303, known for its high water adsorption capacity; has not been previously measured. This study focuses on the measurements of Cp for MOF-303 across a temperature range of 10 °C to 95 °C and at various water vapor loadings. Using Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA), we found that the dry MOF-303 exhibited a Cp of approximately 0.9175 J/g.^oC at 10 °C, increasing to around 1.1695 J/g.^oC at 95 °C. In contrast, fully saturated MOF-303 samples showed higher values, with Cp ranging from 1.72 J/g.^oC at 10 °C to 2.41 J/g.^oC at 95 °C. These findings demonstrate that water saturation significantly enhances Cp, making MOF-303 highly efficient for adsorption cooling systems. Thermal cyclic stability tests confirm the robustness of MOF-303 under repeated heating and cooling cycles. These results provide critical insights into the thermal behavior of MOF-303 and offer a novel contribution to the field. Cp correlations are supplied as a function of temperature and water vapor uptake, facilitating more accurate modeling and optimization of energy-efficient cooling applications.