For the experimental research of hydrogen sorption / desorption processes, a model of a film hydrogen accumulator with a tape foil carrier has been developed and manufactured. Experiments were carried out to study the sorption / desorption (S / D) of hydrogen on a model of a film battery with a tape carrier (NiCr foil 20-50 microns with a titanium coating of 10-15 microns and a magnesium coating of 2-5 microns).
Experiments on the hydrogenation of Mg-Al films during their deposition by magnetron sputtering in a hydrogen atmosphere and subsequent gas-phase hydrogenation have been carried out. The hydrogen mass content and the rate of hydrogen desorption from the obtained metal hydride films have been determined. The key effect of the nickel protective coating on Mg-Al films for their use in hydrogen film accumulators is shown.
Here, the authors report the results of their study on the key characteristics of microscale periodic Ni-Mg-Ni-Mg film structures as metal-hydride hydrogen accumulators, namely, the microstructure, phase state, operation temperatures and rate of the sorption/desorption processes, complete and reversible mass content of hydrogen, and enthalpy of metal hydrides’ phase-formation. The study has shown that hydride-formation films can be saturated with up to 7.0–7.5 wt.% of hydrogen at pressures up to 30 atm and temperatures of 200–250 °C, with a reversible amount of stored hydrogen up to 3.4 wt.% during its desorption at a pressure of 1 atm and temperatures of 250–300 °C with the phase-formation enthalpy in the range of 19.8–46.7 kJ/mol H2 depending on the nickel content (the thickness of the nickel layer). Structural and constructive schemes are proposed for film metal-hydride hydrogen accumulators for various applications of the hydrogen power industry.
Comparative experiments have been performed for the gas-diffusion hydrogenation of vacuum-deposited titanium films and commercially produced titanium foils. The sorption and thermodesorption characteristics of obtained hydrogenated materials and the values of hydrogen mass content in these materials have been defined. Differences in the resulting structure of deposited films and foils after hydrogenation are shown.
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