碳纳米管对LaNi5稀土合金电化学性能的影响

Effect of Carbon Nanotubes on Electrochemical Properties of LaNi5 Alloy

摘要:

采用LaNi5稀土合金作为催化剂，用化学气相沉积法(CVD)制备了碳纳米管。研究了含有5％碳纳米管的LaNi5稀土合金电极样品的电化学性能。测定了碳纳米管电极的电化学储氢性能。实验发现：含有碳纳米管的LaNi5稀土合金的电化学放电容量更高，当放电电流密度为100mA／g时，其电化学储氢量高达385mAh／g。其循环寿命也得到了较大改善。循环100次，放电容量仅下降15％。

Abstract:

The electrochemical properties of doped 5% carbon nanotubes(CNTs) LaNi5 electrode have been investigated. The CNTs were synthesized by chemical vapor deposition method (CVD) using lanthanum nickel alloy(LaNi5) as the catalyst. Three-electrode system was introduced to test the electrochemical hydrogen storage behaviors of CNTs with Ni(OH)2/NiOOH as the assistant electrode and Hg/HgO as the reference electrode. 6mol/L KOH was used as the electrolyte, and the high discharge capacity was measured of 385 mAh/g at a discharge current of 100 mA/g. The doped 5% CNTs LaNi5 electrodes showed higher electrochemical hydrogen storage capacities and a longer cycle life than those of the un-droped CNTs. In addition, the discharge capacity decay was only 15% after 100 cycles.