Hydrogenation and electrochemical corrosion properties of LaNi4.5Co0.5 alloy doped with aluminum

Effect of 1.6 and 3.2at.% additions of Al into LaNi4.5Co0.5 alloy on its gas phase hydrogenation (up to pH2=10bar), electrochemical discharge capacity (0.5C; 1bar), exchange current density of H2O/H2 system (6M KOH) and parameters characterizing electrode corrosion behavior have been evaluated for t...

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Bibliographic Details
Published in:Solid state ionics 2015-03, Vol.271, p.116-120
Main Authors: Dymek, Martyna, Bala, Henryk, Hackemer, Alicja, Drulis, Henryk
Format: Article
Language:English
Subjects:
Corrosion
Discharge capacity
Electrode cycling
Exchange current
Hydrogen storage
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Summary:Effect of 1.6 and 3.2at.% additions of Al into LaNi4.5Co0.5 alloy on its gas phase hydrogenation (up to pH2=10bar), electrochemical discharge capacity (0.5C; 1bar), exchange current density of H2O/H2 system (6M KOH) and parameters characterizing electrode corrosion behavior have been evaluated for temperature of 22°C. The small Al additions clearly (ca 30%) increase the hydride capacity and do not affect- or slightly decrease the exchange current density of H2O/H2 system. On the other hand, the Al-containing alloys are more resistant to corrosion in strong alkaline solution compared to the LaNi4.5Co0.5 precursor. •LaNi4.5Co0.5 hydride precursor was doped with 1.6 and 3.2% of aluminum.•The precursor and Al-doped alloys were gas-phase- and electrochemically hydrogenated.•The discharge capacities of Al-modified alloys are 30% greater than those of precursor.•Al-alloying of LaNi4.5Co0.5 precursor improves its corrosion behavior in 6M KOH.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2014.11.005