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

Krystyna Giza and Edyta Owczarek
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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

Energies, 2021, vol. 14, issue 17, 1-12

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.

Keywords: LaNi 5- x Ge x alloys; electrochemical hydrogenation; corrosion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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