| 초록 |
A recent publication claims that alkali-doped carbon nanotubes (CNTs) can absorb remarkable amounts of gaseous hydrogen. In this work, we have investigated the charge-discharge behaviors of CNTs, and Li, Na and K-doped CNTs in 6M KOH electrolyte. The used CNTs were produced by chemical vapor deposition (CVD), arc-discharge (AD) and laser ablation (LA) methods. The charge-discharge capacities of CNT electrodes increased in the order of AD, CVD and LA grown CNTs. The metal-doped CNT electrodes showed remarkably higher charge-discharge capacities over un-doped CNT electrodes. The Li-doped CNT electrodes showed the best performance in storing hydrogen. The Li-LA sample electrode showed the highest charge and discharge capacities, whereas the Li-CVD sample electrode showed the best capacity reversibility. |
