Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8000831 | Journal of Alloys and Compounds | 2014 | 5 Pages |
Abstract
A simple method was developed to synthesize Mo-Ni compounds using a chemical reduction method. The compound was then added to La-Mg-Ni-based alloy electrodes in order to improve the electrochemical kinetics of the electrodes. Scanning electron microscopy and transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy showed that the as-synthesized compound consisted of nanoparticles with a chemical composition of MoNi2.5. X-ray diffraction analysis revealed that the compound mainly consisted of a MoNi3 and a Ni phase. The Mo-Ni particles were added to the La-Mg-Ni-based alloy electrode material and uniformly distributed on the alloy surface. An improvement in initial discharge capacity and high rate dischargeability (HRD) could be observed, as well as an enhancement of cycle stability. At 1500Â mA/g the HRD increased by 10.2%, and the initial discharge capacity increased from 286Â mAÂ h/g to 307Â mAÂ h/g. After adding the particles to the alloy, the Mo-Ni particles showed a high electro-catalytic activity due to a charge transfer reaction on the alloy surface, thereby decreasing the charge transfer resistance and increasing the exchange current density. Consequently, the kinetics of the electrode reaction was significantly improved due to an enhancement of the electro-catalytic activity.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Yuan Li, Yang Tao, Dandan Ke, Shuqin Yang, Shumin Han,