Anpassning av vätetransporthastigheter i amorfa metaller: från ultra-snabba till ultra-tröga
Tidsperiod: 2019-01-01 till 2022-12-31
Projektledare: Gunnar Palsson, Gunnar Pálsson
Budget: 3 400 000 SEK
Lack of control of the flow of hydrogen in materials is a severe hindrance for many applications such as switchable mirrors, hydrogen gas sensing, hydrogen-induced embrittlement and hydrogen storage. Here we propose a combined optical experimental and theoretical screening method for finding new amorphous metals to create hydrogen super highways and robust roadblocks. We will develop and use combinatorial thin film techniques to create composition gradients on a chip and screen the whole phase diagram of amorphous metal hydrides for potential candidate materials using optical transmission. This will involve both thermodynamic as well as kinetic screening. A fundamental understanding of mechanisms underpinning thermodynamic and kinetic properties such as the hydrogen-hydrogen interaction is required. The only way to measure the strength of the interaction is with neutron reflectometry, by which hydrogen concentration and volume expansion can be measured simultaneously. We have developed a unique neutron scattering chamber, capable of in-situ loading of hydrogen and simultaneous neutron and optical measurements. This chamber will be deployed at neutron reflectometers around the world. We will make early use of the European Spallation Source by using the small focused beam of Estia to carry out single-shot scanning of combinatorial samples and Vespa to measure local vibrational properties.