The effect of the NH₃ activation temperature of graphene/carbon composite nanofibers on their NO catalytic oxidation performance at room temperature

N-doped graphene/carbon composite porous nanofibers were prepared by electrospinning, followed by carbonization in nitrogen and activation in NH₃ at 900, 1 000, 1 100 and 1 200℃ for 20 min, using polyacrylonitrile as a carbon precursor and graphene oxide as an additive. Their NO (50 ppm) adsorption and catalytic oxidation performances at room temperature were tested. Results showed that the catalytic oxidation activity increased with the activation temperature and a maximum conversion of 49.7% was achieved for the sample activated at 1 200℃. The adsorption capacity for NO and NO₂ depended on their specific surface areas. The nitrogen-containing functional groups introduced by NH₃ and the active sites formed in graphene sheets jointly increased NO conversion at room temperature.