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Structural, morphological and transport properties of nanostructured La1-Sr Co0.2Fe0.8O3- thin films, deposited by ultrasonic spray pyrolysis
摘要： The main aim of this study is to improve the electrochemical properties of LaFeO3-δ perovskite as cathode by strontium and cobalt doping in lanthanum and iron sites. Ultrasonic spray pyrolysis (USP) following sintering process in air was utilized to synthesize La1-xSrxCo0.2Fe0.8O3-δ (LSCF) with 0 ≤ x ≤ 0.4. X–ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and impedance spectroscopy techniques were used to study the structure, surface morphology and transport properties of the deposited films. Contrary to what might expect, up to x = 0.4, single orthorhombic phase of La1-xSrxCo0.2Fe0.8O3-δ have been obtained for all deposited films. Impedance spectroscopy results at intermediate temperatures (500–700 °C) indicated that by increasing of strontium, the conductivity increases, and activation energy decreases from 0.41 eV for x = 0–0.24 eV for x = 0.4.
关键词： IT-SOFC,LSCF,Ultrasonic spray pyrolysis
更新于2025-09-23 15:22:29
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Femtosecond Laser Additive Manufacturing of Multi-Material Layered Structures
摘要： Laser additive manufacturing (LAM) of a multi-material multi-layer structure was investigated using femtosecond fiber lasers. A thin layer of yttria-stabilized zirconia (YSZ) and a Ni–YSZ layer were additively manufactured to form the electrolyte and anode support of a solid oxide fuel cell (SOFC). A lanthanum strontium manganite (LSM) layer was then added to form a basic three layer cell. This single step process eliminates the need for binders and post treatment. Parameters including laser power, scan speed, scan pattern, and hatching space were systematically evaluated to obtain optimal density and porosity. This is the first report to build a complete and functional fuel cell by using the LAM approach.
关键词： femtosecond laser,laser,fuel cell,additive manufacturing,fiber laser,YSZ,SOFC
更新于2025-09-23 15:19:57
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Effects of size on the phase stability and conductivity of double-doped δ-Bi2O3
摘要： Nano and micro (Bi2O3)1-x-y(Eu2O3)x(Er2O3)y (x = 0.1, 0.15, y = 0.05, 0.2) double-doped system materials are synthesized by exploiting solid-state synthesis techniques. When we use nano sized powders to synthesize the samples we call them nano; when we use micro sized powders, we call them micro. The thermal, structural, morphological and electrical properties of nano and micro structured electrolyte samples for solid oxide fuel cells (SOFCs) are characterized. As a result of XRD measurements, the face centered δ-Bi2O3 (cubic) phase is obtained for all nano samples. However, the mixed phase is obtained for some micro samples. The electrical measurements show that conductivity decreases when the amount of Er2O3 is increased. The principal conclusion of the study is that the size effect provides relatively good structural stability in intermediate temperature SOFCs (IT-SOFCs); also, the nano-Bi2O3 system has the lowest activation energy and demonstrates high electrical conductivity.
关键词： Solid electrolyte,IT-SOFC,Size effect,δ-Bi2O3,Nano-Bi2O3
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Kannur,Kerala, India (2018.3.23-2018.3.24)] 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - A Comparative Analysis of PID and Fuzzy Logic Controller in an Autonomous PV-FC Microgrid
摘要： In this work, the dependability and performance analysis of a typical hybrid micro-grid compiled with Photovoltaic (PV) arrays and Solid Oxide Fuel Cell (SOFC) is bestowed. The micro-grid is designed to operate in an islanding/autonomous mode to attain the load demand. The Fuzzy Logic Controller (FLC) based Voltage-frequency control (V/f) is applied to effectually control the micro-grid voltage and frequency; the easy flow of power can be achieved from generation to consumption. The voltage as well as the frequency of the proposed micro-grid is consistent even if there is a sudden load or power fluctuation. A dc-dc converter is used to connect the PV and the SOFC to the dc grid. Voltage Source Converter (VSC) helps to maintain the output voltage by enforcing the implementation of Maximum Power Point Tracking (MPPT) techniques by P & O algorithm. When the State of Charge (SOC) falls to its minimal limit, the rated power can be attained by a backup generator called SOFC. The propounded PV-SOFC hybrid micro-grid is critically investigated to scrutinize its performance improvisation by extensive simulation analysis. The system’s improvement in power quality can be demonstrated with the help of results presented. A relative analysis is carried out to study the proposed system with conventional PID Controller is also presented.
关键词： SOFC,PID Control,Microgrid,FUZZY Control,PV
更新于2025-09-09 09:28:46
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Electro-morphological, structural, thermal and ionic conduction properties of Gd/Pr co-doped ceria electrolytes exhibiting mixed Pr3+/Pr4+ cations
摘要： Gd0.2-xPrxCe0.8O1.90, (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) has been synthesized by means of a simple co-precipitation route based on ammonium carbonate as the precipitating agent. The as-synthesized precursors are cerium-gadolinium-praseodymium amorphous hydroxycarbonates, which are nanometric in size with highly homogeneous morphology, leading to reactive doped and co-doped nanocrystalline (≈13 nm) ceria after a mild thermal treatment (2 h at 600 °C). The obtained results highlight the very positive effect of Pr on the powders’ sintering behaviour, which favour a better densification of the final pellets, thus improving both their microstructure (with relative densities of 97–99% after sintering at 1250 °C for 3 h) and electrochemical properties (up to 1.25?10–1 S cm?1 at 800 °C for sample 6Pr) compared to the state-of-art ceria-based electrolytes. Through a comprehensive characterization, a relation was formed between the Pr content and the microstructural features of the sintered pellets and their electrical behaviour. The amount of Pr doping was investigated over a wide range and 6 mol% has been established to be optimal (possessing the lowest electronic conductivity contribution). Definitely, these results indicate that Gd0.2-xPrxCe0.8O1.90 has an excellent set of characteristics, both microstructural and electrical, and a convenient fabrication process, thus making it perfectly suitable for IT-SOFC practical applications.
关键词： Ceria-based electrolyte,IT-SOFC,Co-precipitation,Praseodymium,Nanocrystalline ceria
更新于2025-09-04 15:30:14