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

• Published in: Solid state ionics Vol. 271; pp. 116 - 120
• Main Authors: Dymek, Martyna, Bala, Henryk, Hackemer, Alicja, Drulis, Henryk
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2015
• Subjects: Corrosion; Discharge capacity; Electrode cycling; Exchange current; Hydrogen storage; Discharge capacity; Exchange current; Hydrogen storage; Electrode cycling; Corrosion
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2014.11.005

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.