Science & Technology

New data from double perovskite oxide

Journal of alloys and compounds Has published an article on the properties of cubic double perovskite oxides, co-authored by the Institute of Solid State Chemistry and Mechanical Chemistry (Ural Branch of the Russian Academy of Sciences), the Donostia Center for International Physics, and the HSE Tihonov Moscow Institute of Electronic Mathematics. .. .. To date, experimental measurements of mineral properties have not corresponded to the results of theoretical modeling. This study is the first time that researchers have set up their own work to explain this disparity. The data obtained will allow researchers to improve cryogenic fuel cell technology, which is one of the major alternatives to current power sources.

There is growing support among researchers for using fuel cells instead of the more widely known galvanic cells. A typical battery has a limited amount of material used to generate electricity. When the battery runs out of fuel, the battery will stop working. In fuel cells, hydrogen fuel mixes with oxygen to produce electricity, heat, and water, fuel is supplied from the outside, and oxygen is extracted from the air. This means that such a battery can operate as long as it has a stable power supply. The only by-product of this process is water. This makes the cell an environmentally friendly alternative to manganese or zinc-based batteries. These batteries should be discarded at the end of their life.

individual Oxide Fuel cells (SOFCs) are an increasingly promising technology. The cell uses a ceramic material (such as zirconium dioxide) as the electrolyte. This is the medium between the positively and negatively charged electrodes.Advantage of Solid oxide fuel cell include High efficiency, Reliability, ability to power different types of fuel, and relatively low cost.

Moreover, unlike other types of fuel cells, SOFCs do not necessarily have to be flat with electrolytes between the electrodes. They can take many forms, such as tubes in which air or fuel flows inward and another gas flows outward.

Solid oxide fuel cells also have one major drawback. High temperatures (approximately 500-1000 ° C) are required to maintain the required chemical reactions. Using SOFCs at low temperatures requires expensive platinum catalysts, which significantly increases the cost of fuel cells.

For this reason, many researchers have sought ways to reduce the operating temperature of solid oxide fuel cells without compromising power generation efficiency. Research areas in this area include the search for highly active catalysts for the required reactions, the development of techniques for synthesizing SOFC components, and the creation of effective materials for electrodes.

Researchers have proposed using minerals such as perovskite as electrolytes with the properties required for industrial applications. Perovskite is a class of minerals in which two negatively charged ions and one positively charged ion are bonded together. The authors proposed using a complex oxide of molybdate with a double perovskite structure A.2MeMoO6Where A stands for calcium, strontium, or barium and Me stands for 3d metal or magnesium.

The composition of A = strontium, Me = magnesium or nickel has been identified as the most promising. These oxides exhibit good conductivity under reducing conditions and are resistant to sulfur and carbon oxide impurities in fuel gases.

Characteristics of double perovskite-like molybdenum oxide such as Sr, despite its attractiveness from a practical point of view2Mg1−xNiNSMoO6 Not fully understood. Experimental measurements of material properties differ from theoretical predictions derived from computational modeling. Computational modeling relies heavily on its own initial assumptions and the software code used.

The author of this article made the first attempt to combine computer modeling of the electron spectrum of matter with experimental data from Sr.2Mg1-xNiNSMoO6 Apply an electric current.The result supports the semiconductor nature of Sr2Mg1-xNixMoO6 conductivity. As with metal, the movement of charged particles in a semiconductor produces an electric current. However, in metals, the presence of free electrons is due to the structure of the material and the electron bonding of atoms, but the presence of charge carriers in semiconductors is determined by many factors. The most important of these is semiconductors.

Researchers agree that semiconductors can be effectively used as electrolytes fuel cell Thanks to their excellent electrochemical properties and high ionic conductivity. They believe that further research on double perovskite-like oxides will provide new opportunities to use this promising material in a variety of energy technologies.

New Opportunities for Photocell and Fuel Cell Design

For more information:
Effect of Atomic Defects on High Temperature Stability and Electron Transport Properties of KS Tolstov et al, Sr2Mg1−xNiNSMoO6–δ Solid solution, Journal of Alloys and Compounds (2021). DOI: 10.1016 / j.jallcom.2021.160821

Provided by the Faculty of Higher Economics, National Research University

Quote: Obtained from // with double perovskite oxide (September 7, 2021) obtained on September 7, 2021. New data

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New data from double perovskite oxide New data from double perovskite oxide

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