Green hydrogen will almost certainly play a key role in the energy transition, but it does come with a number of inherent challenges. Its highly flammable and must be stored at high pressures or cryogenic temperatures, which makes hydrogen storage and transport complex and expensive. A student team at Eindhoven University of Technology, called SOLID, is trying to solve this problem by using small iron balls (iron pellets) as hydrogen energy carriers. To achieve this, the team has developed a steam-iron process. When iron is exposed to a flow of hot steam under high pressure it reacts with the water…
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