Elaboration and electrochemical characterization of LaZr2Cr4Ni5-based metal hydride alloys
| Autor: | Mohieddine Abdellaoui, Ouassim Ghodbane, Ines Sahli |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Rietveld refinement Hydride General Chemical Engineering Inorganic chemistry General Engineering Intermetallic General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Chronoamperometry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences chemistry Phase (matter) General Materials Science Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Ionics. 22:1973-1983 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-016-1725-y |
| Popis: | The elaboration of LaZr2Cr4Ni5-based intermetallic compound was performed by mechanical alloying from LaNi5 and ZrCr2 precursors and characterized as active materials of negative electrodes in nickel-metal hydride (Ni-MH) batteries. The effect of the milling duration on the phase composition was investigated. The structural properties of the formed phases were determined by X-ray diffraction and quantified from the Rietveld refinement data. The increase of the milling time up to 40 h leads to the highest abundance of the LaZr2Cr4Ni5 phase, estimated at a weight content of 60.6 %, and a complete elimination of the LaNi5 intermetallic precursor. The chronopotentiometry, cyclic voltammetry, and chronoamperometry techniques were applied to characterize the electrochemical behavior of prepared LaZr2Cr4Ni5-based compounds. The maximum discharge capacity was 152 mAh g−1, and a high electrochemical stability was obtained in the alkaline solution. The value of the hydrogen diffusion coefficient is equal to 2.1 × 10−8 cm2 s−1, reflecting an appropriate electrochemical hydrogenation kinetic in the LaZr2Cr4Ni5-based compounds. |
| Databáze: | OpenAIRE |
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