Electrochemical impedance and deterioration behavior of metal hydride electrodes

The electrode characteristics, the hydrogen equilibrium properties, the crystallographic and mechanical properties of simple ternary alloys of the type LaNi5−xMx(M ≡ Ni, Mn, Cu, Cr, AlandCo) were examined. The effect of substituting elements to improve the cycle life increased in the order: M ≡ Mn, Ni, Cu, Cr, AlandCo. The lower the capacity, the smaller the volume expansion ratio, the slower the pulverizing rate and the lower the Vickers hardness were, the longer the cycle life became. The alloy LaNi2.5Co2.5, which showed the highest durability as a negative electrode, satisfied all these requirements.

Some factors affecting the cycle lives of LaNi5-based alloy electrodes of hydrogen batteries

Catalytically grown graphite nanofibers (GNF) are molecularly engineered structures that are produced by the interaction of carbon-containing gases with small metal particles at temperatures around 600 °C. The fibrous solids consist of minuscule graphene sheets stacked at various angles with respect to the fiber axis. This arrangement generates a material possessing unique chemical properties because unlike conventional graphite crystals, only edges are exposed. Such a conformation produces a material composed entirely of nanopores that can accommodate small-sized adsorbate molecules, such as hydrogen, in the most efficient manner. In addition, the nonrigid pore walls can expand to accommodate the gas in a multilayer conformation. GNF exhibit extraordinary behavior toward the sorption and retention of hydrogen at high pressures and abnormally high temperatures. In this paper we discuss some of the critical factors involved in the adsorption of molecular hydrogen and the influence that this process exerts ...

Further Studies of the Interaction of Hydrogen with Graphite Nanofibers

Rechargeable hydrogen batteries using rare-earth-based hydrogen storage alloys

The influence of cobalt on the electrochemical cycling stability of LaNi5-based hydride forming alloys

Fine particles of hydrogen storage alloys such as LaNi5 and MmNi4.5-Mn0.5 (Mm  misch metal) were encapsulated in a thin layer of copper 1–2 μm thick by means of a special chemical plating method. This treatment prevented further disintegration of the metal and improved the thermal conductivity. The alloy-copper microcapsules, which had dimensions of less than 30 μm, were able to absorb hydrogen easily without special activation and exhibited no decrease in hydrogen storage capacity. Pellets obtained by compressing the microencapsulated powder under a pressure of 5–10 tf cm−2 did not show any visible cracks after 1000 hydrogen sorption cycles.

Preparation and properties of hydrogen storage alloy-copper microcapsules

Fine particles of LaNi 5 were coated with a thin porous copper layer about 1 μm thick by a chemical plating method. The encapsulated alloy powder had a hydrogen storage capacity almost equal to that of the original alloy powder and its compacted pellet had a high thermal conductivity, leading to fast reaction kinetics. The pellet was able to withstand more than 5000 repeated hydriding-dehydriding cycles without disintegration.

Preparation and properties of hydrogen storage alloys microencapsulated by copper

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Preparation and properties of hydrogen storage alloy-copper microcapsules

Preparation and properties of hydrogen storage alloys microencapsulated by copper