Effect of strontium on Nd doped Ba1-x Sr x Ce0.65Zr0.25Nd0.1O3-? proton conductor as an electrolyte for solid oxide fuel cells.

Title Effect of strontium on Nd doped Ba1-x Sr x Ce0.65Zr0.25Nd0.1O3-? proton conductor as an electrolyte for solid oxide fuel cells.
Authors M. Sailaja; V. Babu; N. Murali; V. Veeraiah
Journal J Adv Res
DOI 10.1016/j.jare.2016.12.006
Abstract

This paper investigated the Sr doping effect on the microstructure, chemical stability, and conductivity of Ba1-x Sr x Ce0.65Zr0.25Nd0.1O3-? (0 ? x ? 0.2) electrolyte prepared by sol-gel method. The lattice constants and unit cell volumes were found to decrease as Sr atomic percentage increased in accordance with the Vegard law, confirming the formation of solid solution. Incorporation of Sr into the composition resulted in smaller grains besides suppressing the formation of secondary phases of SrCeO3. Among the synthesized samples BaCe0.65Zr0.25Nd0.1O3-? pellet with orthorhombic structure showed highest conductivity with a value of 2.08 × 10(-3) S/cm(dry air) and 2.12 × 10(-3) S/cm (wet air with 3% relative humidity) at 500 °C due to its smaller lattice volume, larger grain size, and lower activation energy that led to excessive increase in conductivity. Ba0.8Sr0.2Ce0.65Zr0.25Nd0.1O3-? recorded lower conductivity with a value of 4.62 × 10(-4) S/cm (dry air) and 4.83 × 10(-4) S/cm (wet air with 3% relative humidity) at 500 °C than Sr undoped but exhibited better chemical stability when exposed to air and H2O atmospheres. Comparisons with the literature showed the importance of the synthesis method on the properties of the powders. Hence this composition can be a promising electrolyte if all the values such as sintering temperature, Sr dopant concentration, and time are proportionally controlled.

Citation M. Sailaja; V. Babu; N. Murali; V. Veeraiah.Effect of strontium on Nd doped Ba1-x Sr x Ce0.65Zr0.25Nd0.1O3-? proton conductor as an electrolyte for solid oxide fuel cells.. J Adv Res. 2017;8(3):169181. doi:10.1016/j.jare.2016.12.006

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Neodymium

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See more Neodymium products. Neodymium (atomic symbol: Nd, atomic number: 60)is a Block F, Group 3, Period 6 element with an atomic weight of 144.242. Neodymium Bohr ModelThe number of electrons in each of Neodymium's shells is 2, 8, 18, 22, 8, 2 and its electron configuration is [Xe] 4f4 6s2. The neodymium atom has a radius of 181 pm and a Van der Waals radius of 229 pm. Neodymium was first discovered by Carl Aer von Welsbach in 1885. In its elemental form, neodymium has a silvery-white appearance. Neodymium is the most abundant of the rare earths after cerium and lanthanum. Neodymium is found in monazite and bastnäsite ores. It is used to make high-strength neodymium magnets and laser crystal substances like neodymium-doped yttrium aluminum garnet (also known as Nd:YAG). The name originates from the Greek words neos didymos, meaning new twin.

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Oxides
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