*2.10. Surface Area Measurements*

The specific surface area of the samples was measured using nitrogen sorption and a five-point Brunauer–Emmet–Teller (BET) method using a Nova 2000e surface area analyzer (Quantachrome Instruments, Boynton Beach, FL, USA). All measurements were carried out in triplicate. Prior to surface area measurements, the samples were evacuated and degassed for a minimum of 3 h at room temperature.
