The structural and thermal stability, electrochemical hydrogenation and corrosion behavior of LaT5−xMx(T = Co, Ni and M = Al, Ge, Li) phases

• Published in: Solid state sciences Vol. 38; pp. 35 - 41
• Main Authors: Stetskiv, A., Rożdżyńska-Kiełbik, B., Kowalczyk, G., Prochwicz, W., Siemion, P., Pavlyuk, V.
• Format: Journal Article
• Language: English
• Published: Issy-les-Moulineaux Elsevier Masson SAS 01-12-2014; Elsevier Masson
• Subjects: Condensed matter: structure, mechanical and thermal properties; Corrosion; Crystal structure; Electrochemical hydrogenation; Exact sciences and technology; Intermetallic compound; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Thermal expansion; thermomechanical effects and density; Thermal properties of condensed matter; Thermal properties of crystalline solids; Electrochemical hydrogenation; Corrosion; Intermetallic compound; Crystal structure; Differential scanning calorimetry; Scanning electron microscopy; Structure stability; Intermetallic compounds; Electrochemical corrosion; Electrochemical method; Doping; X-ray spectra; XRD; Dispersive spectrometry; Hydrogenation; Thermal stability; Thermal properties; Corrosion resistance; Hexagonal lattices; Hexagonal crystals; Thermal resistance; Solid solutions; Transition elements
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2014.09.016

The structural and thermal stability, electrochemical hydrogenation and corrosion behavior of LaT5−x(M/Li)x (T = Co, Ni and M = Al, Ge) alloys have been investigated using x-ray diffraction, SEM with WDS/EDX, DSC and electrochemical techniques. The prepared ternary and quaternary samples are solid solutions on the base of binary LaCo5 and LaNi5 compounds with hexagonal CaCu5 structure type. By partial substitution of transition metals (Ni and Co) by Al, Ge and Li in the LaT5−x(M/Li)x alloys the discharge capacity increased by 25%. Doping of LaCo5 and LaNi5 binary phases by Al, Ge and Li improves corrosion resistance, thermal stability and absorption capacity during the electrochemical hydrogenation. These alloys passivate effectively in strong alkaline solution.
[Display omitted]
•Synthesis of alloys.•Crystal structure investigations.•Electrochemical properties.•Hydrogen storage properties.•Corrosion properties.