Materials Literature
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A bulk platinum microelectrode calibration method, aiming at providing reliable measurements of the electrical properties of thin solid electrolyte films, is described. The method consists in the determination of the electrically active surface of an electrode of microscopic dimensions based on the confident measureme…
First-principles calculations were performed to evaluate the effects of alkaline-earth (M = Ba, Sr, Ca) doped monoclinic La2GeO5 on oxygen ion conduction. Electronic densities of states of the doped systems La1.75M0.25GeO4.75 showed insulating majority and semiconducting minority spin states while both the perfect La2…
Thin film coating is an effective way to enhance the anti-oxidation property of SOFC metallic interconnect at high temperatures and suppress chromia evaporation from stainless steel which easily causes cathode poisoning at cathode-electrolyte interface. The coating materials are mostly metal oxides and coating technol…
Barium zirconate based proton conducting thin films were fabricated using PLD method with ArF Excimer laser under high and low oxygen partial pressures on silicon wafers, and stress conditions and its transition by thermal annealing were measured by XRD side inclination method. Stress conditions were changed by therma…
SOFC can directly utilize not only hydrogen but also various fuels such as city gas, kerosene, and others by internal reforming reaction on anodes. However, impurities and un-reformed hydrocarbon in fuels can cause degradation associated with e.g. carbon deposition. In this study, in-plane distribution of carbon depos…
We already clarified that chromium deposition near the cathode/electrolyte interface was predominantly affected by the cathode polarization and the chromium deposition occurred not only on the cathode materials (LSM, LSCF etc.) but also on the electrolyte material, which seems to be involved in the electrode reaction…
A osteoporose tem um grande impacto economico nos sistemas de saude publica em varios paises, inclusive no Brasil. Implantes em pacientes com menos de 40 anos, submete os implantes a esforcos mecânicos maiores, por consequencia a troca de implante e maior. O desenvolvimento das proteses apresenta propriedades mecânica…
The SOFC group at JÜLICH works on the development of materials, cell and stack since the early 90s, strongly supported by post-operational analysis. Important achievements are e.g. the development of ferritic chromium steels which are now commercially available and anode substrate cells with power densities exceeding…
Spray pyrolysis deposition (SPD) is a potential method for mass production of ceramics thin film with low fabrication cost. We investigated on the SPD method, and demonstrated that it is a noble method to prepare the electrolyte thin film for solid oxide fuel cells. Controlling the substrate temperature low to about 1…
We construct a variational description for incompressible ground states and charge gaps in the N = 0 LL of graphene which accounts for the 4-fold Landau level degeneracy and for the short range interactions that break the SU(4) spin-valley invariance. Our approach explains the experimental finding that gaps at odd num…
The electrochemical performance of two infiltrated fuel cells and the redox cycling tolerance of such cells are presented. Ni-SDC was infiltrated into a porous YSZ support to form the anode of the infiltrated cells and LSM or Nd-nickelate was infiltrated into a thin porous YSZ layer to form the cathode. The power dens…
Anode-supported micro-tubular solid oxide fuel cells (AS-MT-SOFCs) have been regarded as promising energy conversion devices. In our group, dip-coating and co-sintering techniques were used in order to reduce the cost. In this paper, micro-tubular SOFC single cells (Φ5mm*L50mm) and their stacks are fabricated and asse…
A phase field method is used to simulate the microstructural evolution of nickel-yttria stabilized zirconia composite anode of solid oxide fuel cell based on three-dimensional microstructures reconstructed by focused ion beam-scanning-electron-microscopy technique. By implementing efficient semi-implicit Fourier spect…
The effects of Sr substitution for Ba on the structural properties, electrical conductivity, and electrochemical performance of a cation-ordered perovskite LaBaCo2O5+δ (LBCO) oxide have been investigated as a cathode material for IT-SOFC applications. The electrical conductivity of LaBa0.5Sr0.5Co2O5+δ (LBSCO) is much…
The performance of a polymyer-electrolyte fuel cell is strongly influenced by the movement and accumulation of water. The distribution of water between counter flowing fuel and air streams at dry operating conditions was measured and compared to an equilibrium-stage model for water separation. The model predicts a bro…
Metallic interconnects are less expensive, more conductive and able to form complex shapes than ceramic interconnects for SOFC applications. Most metallic interconnects use alloys containing chromium. At elevated temperatures, chromia scales react with cathode and degrade its performance. Manganese cobalt oxide ((Mn,C…
We have successfully fabricated the porous thin film La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode by spray pyrolysis deposition (SPD) method. Main part of the film deposited at the substrate temperature of 350 oC was already perovskite structure and it became the single phase of the perovskite by the post annealing at the…
Ru was deposited onto Pt by atomic layer deposition to fabricate anodes for direct methanol solid oxide fuel cells (SOFCs). The performance of the SOFCs with Ru/Pt anodes regarding methanol oxidation was compared with that of the SOFCs with pure Pt anodes. The values of maximum power density of the Ru/Pt SOFC were 4.1…
The influence of Lithium adatom and edge modification on the electronic structure and the transport properties of zigzag-edged graphene nanoribbons (ZGNRs) were studied using ab initio density functional theory in combination with the nonequilibrium green’s function methods. We find that lithium adatoms adsorb prefere…
The air maldistribution through different individual cells is frequently encountered in direct methanol fuel cell (DMFC) stacks since most stacks utilize parallel flow configuration. This air maldistribution has been recognized as one of the most important causes for the performance loss and even durability loss of DM…