| dc.description.abstract | Porous materials such as metal-organic frameworks (MOFs) have drawn considerable attention owing to their great potential in energy-related applications such as gas storage, separations, and catalysis, etc. Among various properties of MOFs, their surface area is essential for evaluating their capability in those applications, especially gas storage. The Brunauer-Emmmett-Teller (BET) method is a commonly adopted approach to determining the surface area of porous materials. However, the method has been reported to result in largely overestimated surface areas. To this end, developing alternatives to more accurately determine the surface area of MOFs remains a critical direction in the community.
In this study, through systematically studying the BET surface areas of 263 diverse MOFs, a large loading jump in the adsorption uptake is found to correlate with the overestimation in the area prediction for MOFs, by selecting a linear region that is after the loading gap to calculate the BET surface area can lead to an overestimation of the monolayer capacity and, consequently, an overestimation of the surface area. To improve the accuracy of the BET method, an upper limit can be set to avoid selecting the linear region after the significant uptake of adsorption in the adsorption isotherm. By setting this upper limit, the accuracy of BET method can be enhanced. | en_US |