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Fig. 4. (a) N2 adsorption/desorption isotherms of g-C3N4. Inset: pore size distribution of g-C3N4. (b–d) N2 adsorption/desorption isotherms of Co, N-CNT-T (120 °C, 140 °C, and 160 °C). Inset: pore size distribution of Co, N-CNT-T (120 °C, 140 °C, and 160 °C).