Materials Literature
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An anode-supported flat tubular SOFC stack for intermediate temperature (700~800oC) operation was fabricated and operated in this study. For this purpose, we fabricated anode-supported flat tubular cells by optimization of the current collecting method and the induction brazing process. After that, we designed a compa…
In this study, the reformate operation of solid oxide fuel cells (SOFC) is characterized by electrochemical impedance spectroscopy. The characterization is performed over a broad measuring range of temperature and H/C/O-ratios of the fuel. The kinetic parameters of the electrochemical oxidation of the fuel are obtaine…
Effects of strongly radioactive primary minerals (mainly monazite) on the surroundings are compared in various rocks of the Moldanubian area. Aureoles of secondary phases formed which extend up to 20 µm from the monazite surface. They mainly consist of low temperature clay minerals usually mixed with Fe-hydroxides; in…
This paper presents the influence of operation conditions including steam levels, current density and operating time on the performance of Solid Oxide Fuel Cells (SOFCs) fuelled by tar- containing biosyngas. The performance of SOFCs was evaluated by means of recording impedance spectra and polarization curves of the c…
We report here on the investigation of the direct use of ethanol in solid oxide fuel cells. While the operation on Ni-YSZ anodes leads to detrimental catalytic carbon deposition even at high steam to carbon ratio, diluted ethanol can be directly used on LSCM anodes. Steady operation seems achievable only at high tempe…
Thank to their high power density in a wide range of temperature, anode supported thin film electrolytes are nowadays the mostly used cells in the SOFC area. Unfortunately, the latter suffer from an important problem: they are totally destroyed when re-oxidation occurs in the anode chamber. This happens, for instance…
Solid oxide fuel cells are of great interest for a diverse range of applications. Within the past 10 years, an increase in power density by one order of magnitude, a lowering of the operating temperature by 200 K, and degradation rates lowered by a factor of 10 have been achieved on the cell and stack level. However,…
Electrolyte contacts were used to investigate the properties of pure and N-doped titania nanotubes (ntTiO 2 ). Mott-Schottky analysis gave a flat-band potential E fb = -0.57V vs. Ag/AgCl for pure ntTiO 2 and E fb = -0.22V vs. Ag/AgCl for N-doped ntTiO 2 . The charge carrier density was N D = 6.7 10 20 cm -3 for pure n…
X-ray nanotomography and focused ion beam scanning electron microscopy (FIB-SEM) provide unique opportunities interrogate the 3D microstructure of solid oxide fuel cell (SOFC) electrodes with unprecedented spatial resolution with elemental specificity. Using x-ray nanotomography with differential absorption imaging ac…
Recently Kerafol's alliance with H.C. Starck and the commercial availability of the jointly developed high - output cells with scandium doped zirconia electrolytes was announced. Together the companies are able to provide cells possessing extraordinary performance and long term stability. The combined production facil…
A new type of solid oxide fuel cell (SOFC) is presented which can convert heat absorbed from a high-temperature source to electricity bypassing the Carnot limitation and use solid carbon as the fuel. The essential cell reaction is the partial oxidation of carbon to carbon monoxide, unlike in the case of conventional S…
Ferroelectricity is attractive in data storage application as the polarizations can be used as binary levels. However, conductivity and ferroelectricity cannot be tuned independently in inorganic materials, thus two-terminal resistive memories with ferroelectrics are yet to be achieved. Here, we present an all-polymer…
Hydantoinases are industrial enzymes with varying degree of activities on variable substrates to form different products. Although, few of the hydantoinase structures were known recently, the functional details and active site mechanism were not clearly understood yet. In a structure determination effort we reported t…
The phase transformation of cubic stabilized zirconia in real SOFC stacks, especially in regions along the anode/electrolyte interface, was investigated by micro-Raman spectroscopy. In some real stacks, phase transformation of cubic stabilized zirconia into tetragonal phase was observed at the electrolyte/anode interf…
BaCe0.65Zr0.2Y0.15O3-δ (BCZY) have been recently proposed for IT-SOFCs due to its high proton conductivity. On the other hand considerable efforts are directed towards the development of metal-supported cells. The combination of the potential advantages offered by either proton conductors based cells and metal support…
staxera GmbH is a manufacturer of commercial available solid oxide fuel cell (SOFC) stacks and Integrated Stack Modules (ISM). The aim of development and testing is to meet the requirements of existing customers and the needs of the market. Besides high power densities, low degradation rates in long term operation and…
Liquid tin-lead alloy, liquid bismuth, and liquid tin-lead-bismuth alloy were investigated as potential anodes for a solid oxide fuel cell powered directly by coal. Power generation from direct oxidation of solid coal was demonstrated with a good stability only in the case when liquid tin-lead anode was used. The test…
The corrosion protection of epoxy-polyamide primers containing either hexagonal Pr2O3 or cubic Pr6O11 inhibitors deposited on chromate conversion coated Al 2024-T3 substrates was studied. Electrochemical evaluations, scanning electron microscopy with energy dispersive spectroscopy, and x-ray diffraction were used to c…
The structural disorder and lattice stability of complex perovskite (Ba,Sr)(Co,Fe)O3, a promising cathode material for solid oxide fuel cells and oxygen permeation membranes, is explored by means of first principles DFT calculations. It is predicted that Ba and Sr ions easily exchange their lattice positions (A-cation…
In situ Raman spectroscopy was used to investigate the real time chemistry occurring in solid oxide fuel cells (SOFCs) operating at 715åC with both dry and humidified ethanol. Electrochemical impedance spectroscopy (EIS) measurements were carried out concurrent with the optical studies to correlate changes in SOFC per…