Hybrid Energy Storage System with Unique Power Electronic Interface for Microgrids
ISBN: 978-1-4799-2984-9
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Quantitative fault tree analysis of the Beam Permit System elements of Relativistic Heavy Ion Collider (RHIC) at BNL
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Cross Validation of Current-Potential Sweep and Impedance Measurement of SOFCs and SOECs Implementing CO2/CO as Fuels
The aim of this work is to diagnose the areal specific resistance (ASR) of a solid oxide electrochemical cell implementing a gaseous mixture of CO/CO2 at the negative electrode side. The cell was operated in either fuel cell or electrolyzer mode. Current-potential (i-E) sweep was carried out to investigate polarizatio…
Zirconia Ceramics Effect of Fe2O3 Addition on Conductivity of YSZ Ceramics
Effect of 2 mol. % Fe2O3 addition on conductivity of yttria stabilized zirconia ceramics (YSZ, 6-12 mol.% Y2O3) was established. For Fe doped material, it was shown that conductivity demonstrates maximum at 10 mol. % Y2O3, and its value increases by 1.4 times. It was shown using X-ray phase analysis that the material…
Electrochemical Analysis of Nanoscaled Ba0.5Sr0.5Co0.8Fe0.2O3-δ Thin-Film Cathodes
Nanoscaled Ba0.5Sr0.5Co0.8Fe0.2O3-δ thin-film cathodes deposited by spin-coating followed by pyrolysis of the metal organic precursors (the metal organic deposition [MOD] process) with a film thickness below 100 nm on Ce0.9Gd0.1O1.95 electrolyte pellets were investigated with a focus on the cathode reaction processes.…
Optimization of Water-Based Cathode Inks for Solid Oxide Fuel Cells
A new cathode ink for a solid oxide fuel cell has recently been developed (UK Patent Publication Number GB2490869). It was found to give a power density of 0.33 W/cm2 at 0.7 V at 750°C running on hydrogen. Further optimisation work has been undertaken, focusing on the dispersant: Poly(N-VinylPyrrolidone) - PVP. The ef…
First Principle Researches on Component Optimization Mechanism for the SOFC Solid Electrolyte Materials
First-principle calculations based on DFT method are performed on two theoretical phase structure for potential SOFC electrolyte materials--the fluorite structure for MO2 and corundum structure for M2O3 in which M represents 3rd~6th period metal elements. The energy stability diagram of the oxides is draw, whilst the…
Semiconductors as Selective Redox Electrodes
Electrodes that selectively exchange charge with only certain redox couples in a mixture could improve the performance of photogalvanic and bio-photovoltaic cells described in the literature. One avenue to achieve selectivity is through the use of semiconducting rather than metallic electrodes to exploit the presence…
Higher Performance, Eco- Friendliness, and Reliability for the “SOFC + μGTE” Hybrid Engine and a Lower Cost of the Power Generated
A mutual positive effect, increasing the economic, environmental and life values of the overall hybrid system is implemented in the hybrid engine based on solid oxide fuel cell (SOFC) and eco-friendly ceramic high-temperature (up to 1350 ° C) gas turbine micro engine (μGTE). Should syngas be used as fuel, the 65-70% e…
Development of Medium-Temperature Solid Oxide Fuel Cell Materials and Single Cells in Estonia
Estonian solid oxide fuel cell program started in 2001. Solid oxide fuel cell single cells based on Ni-Ce0.9Gd0.1O2-δ or Ni-Zr0.92Y0.08O2-δ supporting anodes, bi-layered Zr0.92Y0.08O2-δ | Ce0.9Gd0.1O2-δ or Zr0.9Sc0.1O2-δ | Ce0.9Gd0.1O2-δ electrolytes and micro-meso-porous La0.6Sr0.4CoO3-δ, Gd0.6Sr0.4CoO3-δ or Pr0.6Sr0…
Nonlinear Oscillatory Dynamics in Solid Oxide Fuel Cells
It is widely known that electrochemical systems may exhibit oscillatory dynamics, and SOFC’s have been shown to produce both current and voltage oscillations, as well as oscillations in chemical species and temperature. The relationships between the various fuel cell phenomena are complex, and a number of theoretical…
Investigation of a Solid Oxide Fuel Cell Coupled to a Tri-reforming Process
This study deals with an investigation of the performance of a biogas-fed Solid Oxide Fuel Cell (SOFC) operating in combination with an external tri-reforming system. The tri-reforming process is carried out using a ceria supported Ni catalyst (1.75-wt% Ni/CeO2), prepared by combustion synthesis. The catalytic tests a…
Numerical Model of Platinum Dissolution in Polymer Exchange Membrane Fuel Cells with Slow Proton Transfer
The slow proton transfer in the proton exchange membrane that causes a delay of membrane-phase potential changing against solid-phase one is taken into the numerical model and the difference between the experimental and simulation results is elucidated. The slow movement of proton transfer causes the higher cathode po…
Computational Studies on Ionic and Electronic Conduction of Rare-Earth-Based Oxides Based on Density Functional Theory
We studied atomic and electronic properties of La2GeO5- and CeO2-based materials by first-principles calculations based on density functional theory. We investigate the properties in a viewpoint of application to solid electrolytes based on analyses of stable structures, total energies, electronic densities of states,…
Temperature Effect Due to Internal Reforming in Pressurized SOFC
For the integration in a hybrid power plant the behavior of pressurized SOFC stacks was examined. A detailed electrochemical model was validated allowing for a thorough interpretation of experimental data. This contribution focuses on the use of reformate gases and the influence of internal reforming. Experimental and…
Transmission Electron Microscopy Observation of Nickel-Yttria Stabilized Zirconia Catalyst for Solid Oxide Fuel Cells in Methane Atmosphere
Carbon growth site on the surface of a solid oxide fuel cell (SOFC) comprising yttria stabilized zirconia (YSZ) and Ni was observed using transmission electron microscopy (TEM). TEM observations of the YSZ and Ni powder mixture, which was heated in a methane atmosphere, confirmed that graphite was grown on the Ni surf…
Proposal and Study on Optimum Operation of SOFC CGS with EV Charging Stand
Our research group proposes a solid oxide fuel cell (SOFC) co-generation system with charging stand for electric vehicle (EV) as one of new applications of SOFCs. To evaluate the feasibility of the proposed system, the total efficiency, energy saving rate and electricity available for EV charging are calculated by com…
An Innovative SOFC Hybrid Based Prime Supply for Telecom Applications
Telecom companies worldwide are investigating the option of producing the power needed onsite with fuel cells, while staying grid-connected to use the grid, where available, as backup power in case of an emergency only. Among the available technical options, DC based backup power systems have had huge success in telec…
Three-Dimensional Performance Model For Oxygen Transport Membranes
A three-dimensional (3D) finite element method (FEM) model that enables the performance simulation of mixed ionic-electronic conducting (MIEC) oxygen transport membranes (OTM) has been developed. In order to evaluate the influence of a porous functional layer on the membrane performance a numerical geometry generator…
Fabrication of Laminate-Type SOFC; Printed Fuel Cell
We have developed a novel laminate-type SOFC stacks that are composed of thin each layers of electrolyte, electrodes and separator since 2005. These layers are prepared by tape casting and screen printing methods and these stacks are monolithically fabricated by simultaneous sintering these layers. We designate these…