Effect of Ambient Temperature on the Electrochemical Properties of La4MgNi17.5Co1.5 Hydrogen Storage Alloy
| Autor: | Huan-Huan Lu, Cai Xin, Fan-Song Wei, Fan-Na Wei |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Metallurgy Alloy Metals and Alloys Analytical chemistry Exchange current density chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Corrosion Hydrogen storage chemistry Phase (matter) Electrode engineering 0210 nano-technology |
| Zdroj: | Acta Metallurgica Sinica (English Letters). 29:614-618 |
| ISSN: | 2194-1289 1006-7191 |
| Popis: | The effect of different ambient temperatures on the electrochemical properties of La4MgNi17.5Co1.5 hydrogen storage alloy was investigated. The X-ray diffraction pattern shows that the alloy consists of LaNi5-type phase and A5B19-type (Ce5Co19 + Pr5Co19) phase. With the increase of the ambient temperature, the maximum discharge capacity of the alloy electrodes increases from 353.33 (283 K) to 379.25 mAh/g (308 K), and the cyclic stability (S 100) of the electrodes decreases from 80.19 (283 K) to 52.04% (308 K) due to the acceleration of pulverization, corrosion and oxidation at higher ambient temperature. Moreover, it is found that the increase of the temperature can accelerate the diffusion rate of hydrogen in the alloy (D) and increase the exchange current density (I 0), which are beneficial for improving the activation performance and the high-rate dischargeability (HRD) of the alloy electrodes. The activation cycles of the electrodes decrease from 4 (283 K) to 1 (308 K), and the HRD900 of the electrodes sharply increases from 66.36 (283 K) to 95.64% (308 K). |
| Databáze: | OpenAIRE |
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