Elaboration and electrochemical characterization of LaTi2Cr4Ni5 -based metal hydride alloys
| Autor: | Ouassim Ghodbane, Mohieddine Abdellaoui, Marwa Ayari |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Rietveld refinement Hydride Diffusion Inorganic chemistry Intermetallic Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Electrochemistry Metal Fuel Technology chemistry Phase (matter) visual_art visual_art.visual_art_medium |
| Zdroj: | International Journal of Hydrogen Energy. 40:10934-10942 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2015.06.169 |
| Popis: | The present paper focuses on the elaboration of LaTi 2 Cr 4 Ni 5 -based intermetallic compounds by mechanical alloying from LaNi 5 and TiCr 2 precursors and their characterization as negative electrode materials in Nickel-metal hydride (Ni-MH) batteries. The structural properties of the phases were determined by X-ray diffraction and quantified from the Rietveld refinement data. The increase of the milling time up to 25 h leads to the highest abundance of the LaTi 2 Cr 4 Ni 5 phase, estimated at 66 wt%, and a complete elimination of the LaNi 5 intermetallic precursor. The electrochemical techniques were applied to characterize the electrochemical behavior of prepared LaTi 2 Cr 4 Ni 5 -based compounds. The maximum discharge capacity was 115 mAh g −1 and the average capacity retention was equal to 77% upon 60 charge/discharge cycles, indicating a high electrochemical stability in the alkaline solution. The values of the hydrogen diffusion coefficient are equal to 4.18 × 10 −8 and 7.17 × 10 −8 cm 2 s −1 after 8 h and 20 h of milling durations, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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