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a, N2 physisorption isotherm displaying the hysteresis loop indicative of presence of mesoporosity (2–50 nm), while adsorbed quantity of N2 at zero relative pressure indicates presence of microporosity (~1 nm). b, The Barrett-Joyner-Halenda (BJH) pore size distribution derived from the adsorption branch of the isotherm points to the broad size distribution of mesopores and macropores (> 50 nm).
