Improved polarization behaviour of nanostructured La0.65Sr0.3MnO3 cathode with engineered morphology. (1st June 2017)

• Record Type: Journal Article
• Authors: Das, Debasish; Basu, Rajendra N.
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 22(2017)
• Page Start: 15347
• Page End: 15358
• Publication Date: 2017-06-01
• Subjects: Hydrothermal synthesis -- Nanorods -- Cathode -- Polarization -- Solid oxide fuel cell; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.04.254
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: We report a simple synthesis of La0.65 Sr0.3 MnO3 nanorods (LSM-R) through hydrothermal reaction followed by calcination at high temperature (700–850 °C). Thermogravimetric analysis and XRD study reveals that 850 °C is adequate for phase pure LSM-R formation. The microstructure of the powder has been clinically studied using FESEM and TEM. It is observed that the intermediate hydrothermal treatment plays key role in formation of such nanorods. Different bulk properties of LSM-R like sinteractivity, CTE, density, electrical conductivity etc. have been comprehensively studied. A maximum electrical conductivity of around 250 S/cm at 800 °C is obtained when LSM-R specimen is sintered at 1200 °C/2 h. The cathodic polarization of such LSM-R is measured using impedance analysis. It is observed that polarization value initially decreases attains minimum and then starts to increase with increase in cathode sintering temperature and dwelling time. A minimum cathodic polarization value of 0.32 Ω/cm 2 at 800 °C is obtained at an optimized cathode sintering condition of 1000 °C/2 h. Graphical abstract: Highlights: LSM nanorods are prepared through hydrothermal treatment followed by calcination. LSM nanorods show high sinteractivity and excellent electrical conductivity. Cathodic polarization increases with rise of sintering temperature and dwell time. Rod like cathode gives lowest ASR value of 0.32 Ω/cm 2 at 800 °C in air.