To analyze the specific surface area and porosity of the samples, argon gas sorption measurements (GSA) are performed as shown in Fig. , and the specific surface area of the samples is calculated using the Brunauer-Emmett-Teller (BET) equation. The BET surface area is calculated to be 40 m 2 /g for V2O5-2C-DA, 57 m 2 /g for V2O5-6C-DA and 37 m 2 /g for V2O5-12C-DA. All sorption isotherms exhibit a Type II shape without significant hysteresis, according to IUPAC classification, indicating non-porous or macroporous character of all samples. It is notable that the expanded interlayer space, even in the case of V2O5-12C-DA, appears inaccessible for gas sorption. The GSA analysis confirms a comparable surface area and porosity for all samples.