Low temperature synthesized carbon nanotube superstructures with superior CO₂and hydrogen storage capacity

Carbon nanotube (CNT) superstructures prepared at 180 °C are activated to highly porous (1479–3802 m²g⁻¹; 0.83–2.98 cm³g⁻¹) carbons with excellent CO₂uptake; up to 4.8 and 8.4 mmol g⁻¹at 1 bar and 25 or 0 °C, respectively, and exceptional hydrogen storage; up to 7.5 and 14.9 wt% at −196 °C and 20 or 150 bar, respectively, and 4.4 wt% at 25 °C and 150 bar.