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Electrochemical Hydrogenation and Corrosion Behaviour of LaNi 5- x Ge x ( x = 0.3 and 0.6) Alloys

Author

Listed:
  • Krystyna Giza

    (Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, 42-201 Czestochowa, Poland)

  • Edyta Owczarek

    (Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, 42-201 Czestochowa, Poland)

Abstract

The capacitive and kinetic parameters of hydride electrodes obtained on the basis of single-phase LaNi 5- x Ge x alloys ( x = 0.3 and 0.6) were related to their corrosive properties. The content of the article is important from the point of view of the improvement of LaNi 5 type materials for hydrogen energy storage used as anodes in NiMH batteries. The presence of large amounts of germanium (10% at.) in the alloy results in much less surface degradation compared to the low-germanium alloy (5% at.), which, on the one hand, leads to an improvement in the resistance of the high-germanium LaNi 4.4 Ge 0.6 alloy to long-term cycling, but on the other hand, contributes to lower hydrogen absorption by this material. The maximum discharge capacity of 293 mAh g −1 was obtained for the low-germanium alloy using a charge/discharge current density of 185 mA g −1 . The studied electrode also shows a lower tendency to self-discharge and a clearly higher exchange current density.

Suggested Citation

  • Krystyna Giza & Edyta Owczarek, 2021. "Electrochemical Hydrogenation and Corrosion Behaviour of LaNi 5- x Ge x ( x = 0.3 and 0.6) Alloys," Energies, MDPI, vol. 14(17), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5285-:d:622155
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