Materials Literature
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Solid oxide cells with reversible mode would generate power during high peak demand, and produce chemical fuel with renewable energy such as wind power and solar power. In this study the reversible performance of an anode-supported proton-conductive cell was investigated under SOFC and SOEC modes. The cell can show th…
The mechanical behavior of an anode-supported cell during reoxidation at high temperature was investigated using an X-ray computed tomography (CT) method. During reoxidation with no seal, warping of the anode-supported cell increased and a critical crack was seen at 1023 K in the CT images. The mechanical behavior and…
For the hydrogen electrode in the solid oxide electrolysis cell (SOEC), nanometer-sized Ni catalysts were highly dispersed on samaria-doped ceria (SDC). It was found that the current density on Ni-dispersed SDC at 900 °C and the potential of ‒1.0 V vs. air increased by 1.5 times with decreasing the Ni particle size fr…
The nanopowder for the Ni-YSZ anode functional layer (AFL) was prepared by ammonium carbonate co-precipitation method. The electrolyte thickness of the Ni-YSZ-based cell with the anode functional layer was about 16 μm. The anode functional layer coated 2times by dip-coating method was 18 μm in thickness. Compared to t…
Microstructural change of porous electrodes in SOFC caused by sintering affected by materials and impurities is one of the main factors of the long-term degradation. Since it is difficult to clarify the effects of materials and impurities on sintering by experiments, atomistic scale simulation is important. In this st…
Cubic perovskite Ba0.5Sr0.5Co0. 8Fe0.1R0.1O3–δ (R=Fe, Nb, Mo, Sb) was synthesized, and the chemical stability under high oxygen partial pressure (p(O2)) was studied by using HT-XRD in the temperature range of 773-1373 K. It was found that Ba0.5Sr0.5Co0. 8Fe0.1Sb0.1O3–δ was remarkably stable than Ba0.5Sr0.5Co0. 8Fe0.2O…
Cathodic reaction of protonic ceramic fuel cells (PCFCs) using SrZrO3 based proton conducting electrolyte with perovskite oxide cathode is studied. A dense La0.6Sr0.4CoO3 (LSC) film is fabricated on 10mol% Y-doped SrZrO3 (SZY) electrolyte using pulsed laser deposition (PLD) method as a cathode. Cathodic performance of…
We have been developing solid oxide fuel cells (SOFCs) to increase electric power self-sufficiency and reduce carbon dioxide emissions in relation to our telecommunication business. We have developed a new model SOFC stack, which is 30% smaller than the previous one (140 mm × 140 mm footprint), with a metallic separat…
It is necessary to develop methods to study sheet resistances of graphene-based thin films in order to facilitate future electronic devices. In this article, compact, smooth and uniform graphene-based thin films were fabricated by blade coating process with strong adhesion to glass substrates. Sodium dodecyl sulfate w…
The present paper discusses the performance analysis of a combined power generation system driven with syngas from the coal gasification process. This system consists of a solid oxide fuel cell – gas turbine hybrid system and an exhaust heat power generation (EHPG) system with a steam turbine. The rankine cycle is exe…
Glass-ceramic seals play an important role in the performance of electrochemical devices like solid oxide fuel cell (SOFC), high temperature electrolysis (HTE) and ceramic membrane reactors. In addition to gas tightness and electrical resistivity, a seal material must have a set of thermo-mechanical and chemical prope…
Study on corrosion propensity of welded mild steel- bar in soil media around the coastal area of University of Lagos has been carried out using gravimetric method. Six (6) samples each for welded and unwelded mild steels were cut, their initial weights were recorded and buried in two selected soil. The weight losses o…
Over the past ten years, scaled-up utilisation of a previously under-exploited zeolite, Zeolite N1, has been demonstrated for selective ion exchange of ammonium and other ions in aqueous environments. As with many zeolite syntheses, the required source material should contain predictable levels of aluminium and silico…
The influence of the oxide component in Ni–oxide based cermet anodes on the performance stability was examined at 1000°C with a supply of highly humidified hydrogen, 40% H2O–60% H2. Three types of anodes were applied; Ni–samaria-doped ceria (Ni–SDC), Ni–yttria-stabilized zirconia (Ni–YSZ), and Ni–scandia-stabilized zi…
Fabrication of novel three-dimensional material architectures is essential for successful development of energy storage devices that allow high rate operation along with sufficient energy capacity. To this end, we report a facile methodology to fabricate hierarchically-porous nanofiber-based electrodes for electric do…
The work describes the use of cyclic voltammetry to investigate the proton coupled electron transfer (PCET) pathways for oxidation of thymine in water. Biologically important compounds like DNA bases, and amino acids showed irreversible behavior when oxidized electrochemically. The reversible redox potentials for such…
The c-axis oriented apatite-type silicates were fabricated in simple ways: fabrication of melt-quenched glass and its crystallization. It was found that a degree of c-axis orientation was affected by many factors such as crystallization temperature and kind of powder materials, in which the precursor glass embedded du…
This paper presents a detailed model to evaluate power density, species concentration, operating current/voltage, efficiency and temperature of a solid oxide fuel cell (SOFC) operating under direct internal reforming conditions. The computational framework, at the unit-cell level, encompasses a detailed 42-step reacti…
Composite oxides have been attracting great interest recently as alternative materials for SOFC anodes with the potential to overcome the serious deterioration in performance associated with the traditional Ni-based cermet; in particular, oxide based anodes show enhanced carbon coke and re-oxidation tolerance compared…
In the frame of a common project on the development of prototype micro-cogeneration systems for household applications, ENEA and FCLAB have characterized a 1kWel and a 2.5kWel tubular-type SOFC technology-based unit respectively. Spanning the entire operational window of the two systems (within boundary conditions set…