Abstract
An alternative route for metal hydrogenation has been investigated: cold plasma hydrogen implantation on polyol-made transition metal nanoparticles. This treatment applied to a challenging system, Ni–H, induces a re-ordering of the metal lattice, and superstructure lines have been observed by both Bragg–Brentano and grazing incidence X-ray diffraction. The resulting intermetallic structure is similar to those obtained by very high-pressure hydrogenation of nickel and prompt us to suggest that plasma-based hydrogen implantation in nanometals is likely to generate unusual metal hydride, opening new opportunities in chemisorption hydrogen storage. Typically, almost isotropic in shape and about 30 nm sized hexagonal-packed Ni2H single crystals were produced starting from similarly sized cubic face-centred Ni polycrystals.
Highlights
The search for energy alternatives to reduce human dependency on fossil fuels has been a very pressing topic for the last few decades
We aimed to develop a new material-processing approach based on soft chemistry, namely the polyol process [41], and cold H2 plasma implantation, to produce non-usual metal hydride granular nanomaterials with a high and ideally reversible hydrogen storage capacity
As a proof of concept, we presented here our results on the synthesis by the polyol process of Ni nano- and polycrystalline particles, with an average size ranging between 25 and 30 nm, and their total transformation within Ni2H single crystals of almost the same size thanks to their treatment in a 2.45 GHz microwave plasma source at 180 W plasma power and 1 mbar working pressure and room temperature. operating temperature
Summary
The search for energy alternatives to reduce human dependency on fossil fuels has been a very pressing topic for the last few decades. Hydrogen emerged as a carbon-free fuel with the highest known energy content, while emitting in its combustion, in a fuel cell or combustion chamber, only water as by-product [1]. This is true when hydrogen gas is produced from water using renewable electricity (electrolysis) or solar energy (photoelectrolysis) and it is efficiently stored and transported. This closed cycle is expected to form the basis of a future CO2-free energy system, but only water-splitting hydrogen production is going to become an industrial reality [2,3]. Hydrogen physisorption on carbon materials [8,9,10,11]
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