High hydrogen storage capacity of heteroatom-containing porous carbon nanospheres produced from cross-linked polyphosphazene nanospheres

摘要

Heteroatom-containing porous carbon nanospheres were fabricated by forming polyphosphazene nanospheres and carbonizing them with NaOH as activating agent. They were then examined as a material for hydrogen stor-age. N_2 sorption and H_2 sorption measurements showed that the carbon nanospheres possess a BET surface area of 1140 m~2 g~(-1) a total pore volume of 0.90 m~3 g~(-1), an ultramicropore volume of 0.30 m~3 g~(-1), a bimodal pore size distribution (3-5 nm and 0.6-0.8 nm diameter pores), and a gravimetric hydrogen uptake of 2.7 wt.% at 77 k and 1 atm.