SOFCRoll is a self-supporting, double spiral design combining the advantages of the planar system, thick film manufacturing techniques and robustness of the tubular design. SOFCRoll cells are produced entirely by tape casting and co-sintering, with a volume of less than 2.5cm3 and a large active surface area that exceeding 20cm2. We are currently investigating the incorporation of the A-site deficient, nickel doped perovskite La0.43Ca0.37Ni0.06Ti0.94O3-γ into the SOFCRoll. In the SOFCRoll with La0.43Ca0.37Ni0.06Ti0.94O3-γ - Zr0.92Y0.08O2-γ fuel electrode, the Zr0.92Y0.08O2-γ electrolyte and (La0.8Sr0.2)0.95MnO3 - Zr0.92Y0.08O2-γ oxygen electrode, the electrochemical poling at 2.3V for a few minutes triggered exsolution of nickel nanoparticles and increased the power density. This paper will present the complete methodology behind SOFCRoll manufacture and ceramic processing, with the results of microstructure analysis, shrinking of individual components and recent performance tests.
Ammonia is now being widely considered as a carrier for low carbon hydrogen due to its favourable physical properties and the existing infrastructure for its transport, storage and distribution. The...
Tubular solid oxide fuel cells (SOFCs) have great potential in micro-combined heat and power systems and portable applications. A small tubular SOFC is developed and fabricated by tape casting and co-sintering. This method is advantageous for simple manufacturing, low cost and ability for mass production. The La0.43Ca0.37Ni0.06Ti0.94O3-γ (LCNT) is adopted as anode for its attractive redox performance and electrocatalytic activity promoted by exsolution of nickel nanoparticles. The power output of a single tubular SOFC at 850 °C increases from 0.32 W to 0.47 W by applying a constant voltage of 2.3 V for 10 min. With 3%H2O/H2 as fuel, the stability of redox performance of the tubular SOFC is tested and the cell endures 20 redox cycles at a fixed voltage of 0.7 V. SEM morphology shows that the exsolution of nickel nanoparticles is enhanced by reducing the perovskite under a constant potential, which increases the electrochemical activity and conductivity.
Solid Oxide Fuel Cells (SOFCs) with an alternative fuel electrode based on nickel-doped lanthanum calcium titanate (La0.43Ca0.37Ni0.06Ti0.94O3-γ, LCNT) were produced with SOFCRoll geometry. The SOFCRoll is a self-supporting cell based on a double spiral shape, where all the layers are tape cast, rolled and fired in a single step. The SOFCRoll has the advantage of the planar system, thick film manufacturing techniques, robustness of the tubular design and very high volumetric surface area. The paper presents further work on cell optimisation to improve the current collection and gas distribution within a cell structure. The design modification and co-sintering of the newly developed collector fuel electrode layers allowed the optimal use of a 12 cm2 surface area.
The tubular cells were produced by a simple and inexpensive method, suitable for mass production. A porous YSZ backbone was co-cast with a thin layer of YSZ electrolyte over it. After rolling in tubular shape and co-sintering, the porous backbone was impregnated with functional perovskite materials, the nickel doped lanthanum calcium titanate LCNT (La0.43Ca0.37Ni0.06Ti0.94O3-γ) for the fuel side and the lanthanum strontium ferrite LSF (La0.8Sr0.2FeO3) for the air electrode.The LCNT perovskite was proposed as the alternative fuel electrode due to its mixed ionic and electronic conductivity (MIEC) properties and catalytical activity supplemented by exsolved Ni nanoparticles. The electrochemical poling at high potential, so-called 'switching', can increase the activity of LCNT due to facilitated reduction and exsolution. After switching at 2.1 V for 2 min, the tubular cell performance in fuel cell mode increased threefold. The impedance analysis indicated a reduction of ohmic and polarisation resistance on the whole frequency range and facilitated electrode kinetics under applied voltage.In this work, the production method was further simplified and improved. A co-casting method was applied for producing porous YSZ backbone on YSZ electrolyte, which after sintering was impregnated with La0.8Sr0.2FeO3 (LSF) for oxygen electrode and
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