Abstract
High entropy oxides are entropy-stabilised oxides that adopt specific disordered structures due to entropy stabilisation. They are a new class of materials that utilises the high-entropy concept first discovered in metallic alloys. They can have interesting properties due to the interactions at the electronic level and can be combined with other materials to make composite structures. The design of new meta-materials that utilise this concept to solve real-world problems may be a possibility but further understanding of how their phase stabilisation is required. In this work, biplots of the composition’s mean electronegativity are plotted against the electron-per-atom ratio of the compounds. The test dataset accuracy in the resulting biplots improves from 78% to 100% when using atomic-number-per-atom Z/a ratios as a biplot parameter. Phase stability maps were constructed using a Voronoi tessellation. This can be of use in determining stability at composite material interfaces.
Highlights
Redox-active metal oxide/carbon composites can play a crucial role in upcoming technologies of energy conversion and energy storage especially in areas such as batteries and water electrolysis [1,2,3]
Mullivalence, and atomic number perelectronegativity, atom. These 6 parameters combine together to form a ken electronegativity, Pauling valence electron concentration, d-va2 design-of-experiment grid for 9 possible combinations, which were analysed using the2 lence, and atomic number per atom
Z/a can be used ofof novel compositions thatthat can can be incorporated can used to toguide guidethe thedevelopment development novel compositions be incorpointo composite structures for new such assuch battery anodes.anodes
Summary
Redox-active metal oxide/carbon composites can play a crucial role in upcoming technologies of energy conversion and energy storage especially in areas such as batteries and water electrolysis [1,2,3]. The development of cost-efficient oxygen evolution reaction electrocatalysts based on low-cost 3d transition metals oxides is a priority challenge of materials chemistry. The demand for energy storage devices in stationary and mobile applications has increased rapidly over the past years and will continuously increase in the future. Used electrochemical energy storage devices are intercalation-based Li-ion batteries with high efficiency and reversibility. There is a push to achieve higher energy storage capacity in systems. Li-ion batteries present several problems throughout the production, distribution, utilisation, and disposal process
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