Materials Literature
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A challenging barrier for the broad, successful implementation of SOFC/SOEC technologies, remains the long term stability by the effective control and minimization of degradation resulting from carbon built up. A class of Au-modified commercially available NiO/GDC and NiO/YSZ cermet powders has been developed and stud…
Recently, solid oxide fuel cells(SOFCs) has been considered as desired devices for generating electricity by electrochemical combination of a fuel with an oxidant. Oxygen ion conductors are usually used as the electolytes for SOFCs. Among several types of oxygen ion conductors such as CeO 2 , stabilized Bi 2 O 3 and Z…
Cr vaporization and oxide scale growth are probably the two most detrimental degradation mechanisms associated to Cr 2 O 3 -forming alloys as interconnect material in SOFC. Both issues can be improved by the application of coatings. However, the use of coatings increase material cost. To reduce coating costs it is sug…
Electrochemical impedance spectroscopy was used to characterize anode compositions made of (La 0.75 Sr 0.25 ) 0.97 Cr 0.5 Mn 0.5 O 3 (LSCM) and gadolinia doped ceria (CGO) with and without additional submicron Ni, or exsoluted Ni nanoparticles. In addition, the effects of the anode gas flow rate and the working temper…
Low Cr stainless steels could represent a cost-effective alternative to high Cr alloys for use as metallic interconnects at the lower end range of Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Main drawback is represented by their insufficient long-term corrosion resistance, requiring suitable corrosion…
To investigate the chemical compatibility of A-site deficient LST anode and stabilized zirconia electrolyte, (La 0.25 Sr 0.75 ) x TiO 3 (x=0.86, 0.88, 0.885, 0.887 and 0.89) powders were prepared by sol-gel method. TiO 2 precipitated in each LST sample except LST-0.89. The amount of TiO 2 precipitated in A-site defici…
We evaluated the effect of LSCF microstructure on the stability of GDC interlayer by performing cation diffusion experiments on LSCF/GDC/YSZ triplets. For this purpose, we prepared porous and dense LSCF layers on pre-annealed dense GDC/YSZ diffusion couples and performed subsequent heat treatments. Here we observe tha…
We have been developing a tubular electrochemical cell composed of Ni-cermet support/YSZ/GDC/LSCF-GDC or Ni-cermet support/GDC/LSCF-GDC in order to synthesize energy-carrier chemicals (methane etc.) via co-electrolysis of H 2 O-CO 2 mixed gas. In this report, we will show effects of (1) the cell fabrication processes,…
A tri-layer electrolyte membrane is proposed for high temperature reversible fuel cells. The tri-layer electrolyte consists of a central dense layer of a purely oxygen ion conducting material such as yttria-stabilized zirconia (YSZ), a thin dense p-type mixed oxygen ionic electronic conducting (MIEC) layer such as LSC…
Understanding in-situ temperature distribution of a SOFC stack while in operation is very important for its performance and degradation studies. The available efforts in literature are incapable of measuring the temperature of electrodes. The proposed multi-junction thermocouple network, which requires only 2N thermo-…
Solvent‐borne alkyd urethane coating compositions containing 20 or 40 wt% (on solids) of partially solvolyzed waste polyurethane foam (PUR) were prepared and analyzed. Partial solvolysis of the soft polyurethane foam was carried out via extrusion with either 5 or 10 wt parts of solid polyol, that is, trimethylolpropan…
This book is intended as a very advanced undergraduate or graduate textbook. It is appropriate for senior undergraduates, first- and second-year graduate students and postdoctoral fellows in mechan...
Ferritic stainless steel interconnect plates are widely used in planar solid oxide fuel cell (SOFC) or electrolysis cell (SOEC) stacks. During stack production and operation, nickel from the Ni/YSZ fuel electrode or from the Ni contact component diffuses into the IC plate, causing transformation of the ferritic phase…
In the EU-funded project "SOCTESQA" partners from Europe and Singapore are working together to develop uniform and industry wide test procedures and protocols for solid oxide cells and stacks SOC cell/stack assembly. New application fields which are based on the operation of the SOC cell/stack assembly in the fuel cel…
A method of ultrasonic welding polyamide sealing gaskets using infrared radiation is developed. A method of thermal ultrasonic butt welding of polyamides which increases the strength, quality and endurance of the welded joints is described. The results of mechanical and service tests of the welded joints in polyamide…
Hierarchical superstructures of Ag nanoparticles with novel morphology resembling multiple growth hillocks were synthesized for the first time using photochemical method through the screw-dislocation-driven, nanoparticle-mediated crystal growth mechanism. The Ag nanoparticles were in situ synthesized from the photored…
In this paper, we obtained a ferromagnetic (FM) Mn0.36Fe0.6Ni0.98Si compound in which magnetic and structural transitions are coupled together. By combining Fe doping and Mn depletion, the magnetostructural coupling was realized, with a magnetostructural transition happening at 337 K from paramagnetic hexagonal phase…
Amorphous hydrogenated carbon (a‐C:H) deposited on steel with plasma enhanced chemical vapor deposition can be used as elongation tolerant oxygen barrier. However, the elongation tolerance of the a‐C:H film is lost if deposited on a poly(ethylene terephthalate) (PET) for reasons unknown. To assess this phenomenon, a‐C…
A wet powder spraying (WPS) method was applied to prepare protective layers of manganese cobalt spinel oxide (MCO) on commercial stainless steels of solid oxide fuel cell (SOFC) interconnects. Densification of the MCO layer was dependent on the thermal treatment condition in which a reactive sintering increased the co…
In this work the oxidation of Crofer 22 APU and its interaction with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) applied as contacting layer have been investigated in air at 750°C under a current load of 0.5 Acm -2 with the aim to reproduce as close as possible the interconnect interface in real operating conditions. The e…