Hydrogen is an attractive fuel of the future, because it doesn’t have any greenhouse gas emissions during its combustion. The one problem that we run into with using hydrogen as fuel is its storage. As the two most commonly used techniques like storage of liquid hydrogen and hydrogen under high pressure are potentially dangerous because of the low temperature or high pressure respectively. Metal hydrides are considered as an interesting storage medium, because they offer safe hydrogen storage. In recent years, new materials have emerged in this field, the so called high-entropy materials, which include high-entropy alloys. These offer a much wider design space compared to traditional alloys due to the possibility of fine tuning their composition and consequently tweaking their properties. The thesis will present the basic concepts of high-entropy materials (synthesis, the most common techniques for characterising their microstructure and composition, hydrogen storage). The aim of this work is to also explore how high-entropy alloys have performed in the field of hydrogen storage, and some examples of such materials.
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