Researchers from Delft University of Technology in the Netherlands and Vrije Universiteit Amsterdam have demonstrated that the size of metal alloy nanoparticles can change the rate at which hydrogen gas stored in metal hydrides is released. The smaller the nanoparticles, the faster hydrogen can enter the fuel cell. The researchers published their findings in the October issue of the scientific journal Advanced Energy Materials.

　　Currently, hydrogen needs to be stored in car fuel tanks at a pressure of 700 bar. Therefore, the filling station requires a high-pressure pump to inflate the car's fuel tank, and the high-pressure pump consumes a lot of energy. So there are good reasons to look for new hydrogen storage technologies. Metals such as magnesium can absorb high-density hydrogen without high pressure, but their disadvantage is that it is difficult to release the hydrogen again and the release process is very slow. One way to speed up hydrogen release is to use magnesium nanoparticles adsorbed on a substrate to eliminate particle agglomeration.

　　Bernard Damm, professor of materials science for energy conversion and storage in the Netherlands, and his colleagues at Delft University of Technology and Vrije Universiteit Amsterdam, experimentally demonstrated that interactions between nanoparticles and substrates can accelerate the release of hydrogen. They used magnesium foil and titanium foil to create models to demonstrate how hydrogen pressure can be released. This means we can store hydrogen using nanoparticles adsorbed on a substrate. The choice of matrix material will determine how much hydrogen desorption pressure needs to be used.

　　Cost-effective hydrogen storage technology will play an important role in the widespread application of hydrogen fuel cells. Bernard Damm believes that future hybrid cars will use batteries for short distances and hydrogen for long distances. "Your electric cars will be powered by batteries in the city and hydrogen for longer trips," he said.

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