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One-Dimensional Nanomaterials for Supercapacitors
Published in Inamuddin, Rajender Boddula, Mohammad Faraz Ahmer, Abdullah M. Asiri, Morphology Design Paradigms for Supercapacitors, 2019
Lang et al. reported that strontium-doped lanthanum manganite perovskite is a potential composition for preparing electrode materials. By using an improved sol-gel method, lanthanum manganite (La1−x Srx MnO3, LSM) perovskites were prepared; among these LSM samples, a sample of x = 0.15 showed excellent electrochemical performance and provided lower intrinsic resistance in 1 M KOH. In supercapacitors, a mesoporous La1−x Srx MnO3 perovskite was introduced as anion-intercalation-type electrode [19]. This material was synthesized by a green process, in which the ratio of strontium doping was tuned. Embedding of OH− into the lattice will increase the electrochemical performance. This LSM (lanthanum-strontium-manganite) showed the pseudocapacitance effect due to the OH− ions present in the electrolyte. Manganese and strontium elements in the electrolyte separated after a few discharge and charge cycles, which led to poor cycle stability and damage of the perovskite structure. The results indicated that superior capacitive behavior and good charge storage performance are achieved by LSM15 through a mechanism known as anion-intercalation [19].
Solid Oxide Fuel Cells (SOFCs)
Published in Xianguo Li, Principles of Fuel Cells, 2005
Most attractive cathode electrode materials may be the oxides with mixed conduction (i.e., they can conduct both oxygen oxides and electrons). For such electrodes, the entire electrode structure becomes the electrocatalystic sites for the electrodecharge transfer reaction, increasing significantly the active surface area available for the reaction. As a result, the electrode polarization may be reduced significantly. In this sense, the cathode material of choice, Sr-doped lanthanum manganite, is the best available material for SOFC cathode since it conducts electrons and can also conduct oxygen oxides when partially reduced to create oxygen vacancies at high cathodic-polarization conditions. Because of thermal expansion mismatch with the electrolyte material, ideal cathode material is still to be developed.
Ion-beam-induced ferromagnetism in Ca-doped LaMnO3 thin films grown on Si (100)
Published in Radiation Effects and Defects in Solids, 2018
Khalid Sultan, Shah Aarif ul Islam, Zubida Habib, M. Ikram, K. Asokan
In our study, it can be seen that all these films exhibit a single-phase perovskite-type orthorhombic lanthanum manganite structure. The full width half maximum (FWHM) is calculated from peak (121). The effect of ion fluence on lattice parameters, FWHM and strain is given in Table 2. It is observed that the calculated strain and FWHM increases after irradiation for all the doping concentrations. In addition to this, deviated lattice parameters were observed for the films after irradiation. The strain developed and an increase in FWHM in the films after irradiation confirms the reduction in crystallinity of these films.