Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10642340 | Physica E: Low-dimensional Systems and Nanostructures | 2005 | 7 Pages |
Abstract
We have investigated the electrochemical hydrogen storage performances of LaNi5 electrodes doped with carbon nanotubes (CNTs); the CNTs were prepared by chemical vapor deposition using a rare earth alloy as catalyst in a C2H2/H2 atmosphere. A three-electrode system was introduced; the above electrodes were used as the cathodes of the electronic cell, NiOOH/Ni(OH)2 as the anodes, and Hg/HgO as the reference electrodes. A 6Â M aqueous KOH solution was introduced as the electrolyte. When the LaNi5 electrode was doped with 10% carbon nanotubes to its active material, it had a capacity of 407Â mAh/g under the charge/discharge current density 200 and 100Â mA/g, respectively. The discharge voltage limit was set as 0Â V. The discharge trend is steadier while discharge plateau is improved to 0.875Â V. Furthermore, we compared the electrochemical hydrogen storage capability of the LaNi5 electrodes doped with different ratios of CNTs (15%, 10%, 7% and 5%) under the same charge/discharge condition and found that the optimum doped quantity of CNTs is 10% in our experiment confines. The polarization peculiarity of each electrode was tested by the Transistor Potentiostat, which exhibited that LaNi5 electrodes doped with CNTs of different ratios have different electrochemical activation character.
Keywords
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Xiaojuan Fu, Haiyan Zhang, Yiming Chen, Shunhua Li, Shuangping Yi, Chun Zhou, Minghua Li, Yanjuan Zhu, Jin Chen,