Comparison of Power Densities and Chemical Potential Variation in Solid Oxide Fuel Cells with Multilayer and Single‐Layer Oxide Electrolytes

Anode supported solid oxide fuel cells (SOFC) were fabricated by addition of various metal oxides such as Fe2O3, Co3O4 and TiO2 to thin anode functional layers between the electrolyte (yttria-stabilized zirconia, YSZ) and electrode materials (anode support: YSZ-NiO). Effect of the additives on the power density and impedance spectra of SOFC was studied. It was found that addition of Co3O4 to anode functional layer was most effective towards improvement of power densities and reduction of the total ohmic resistance as well as the area specific resistance of the cells, while addition of TiO2 to anode functional layer resulted in lower power densities. Possible mechanisms on the relationship between the additives in electrode functional layers and the cell performance were briefly discussed.

Download Full-text

Measurement of Oxygen Chemical Potential in the Electrolyte in Solid Oxide Fuel Cells

ECS Meeting Abstracts ◽

10.1149/ma2007-02/11/801 ◽

2007 ◽

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Chemical Potential ◽

Solid Oxide ◽

Oxide Fuel ◽

Oxygen Chemical Potential

Download Full-text

FABRICATION AND CHARACTERIZATION OF ANODE SUPPORTED SOLID OXIDE FUEL CELLS

Functional Materials Letters ◽

10.1142/s1793604711001725 ◽

2011 ◽

Vol 04 (02) ◽

pp. 161-164 ◽

Cited By ~ 1

Author(s):

SZYMON KOSEDOWSKI ◽

SEBASTIAN MOLIN ◽

PIOTR JASINSKI

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Cross Sections ◽

Cost Effective ◽

Solid Oxide ◽

Oxide Fuel ◽

Screen Printing Method ◽

Deposition Parameters ◽

Power Densities

In this work, slurry spraying is evaluated as a deposition method of thin electrolytes for solid oxide fuel cells. This method is cost effective, uncomplicated and have several advantages in respect to widely used screen printing method. Influence of deposition parameters: slurry concentration, spraying pressure are discussed. Anode supported cells are produced with three different electrolyte thicknesses: 5, 10 and 20 μm showing flexibility of the developed method. Prepared fuel cells achieve satisfactory power densities of almost 1 W cm-2 at 800°C. As evidenced by impedance spectroscopy, performance of cells is determined by the polarization resistance. Cross sections of cells show that all electrolyte layers are of high quality. Slurry spraying is a feasible method for fabrication of functional cells and can be easily scaled for large quantity production.

Download Full-text

Solid Oxide Fuel Cells: Status, Challenges and Opportunities

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.45.1837 ◽

2006 ◽

Vol 45 ◽

pp. 1837-1846 ◽

Cited By ~ 2

Author(s):

Subhash C. Singhal

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Power Density ◽

Combined Cycle ◽

Solid Oxide ◽

Oxide Fuel ◽

Exhaust Heat ◽

Challenges And Opportunities ◽

Lower Temperature ◽

Power Densities

A solid oxide fuel cell (SOFC) electrochemically converts chemical energy of a fuel into electricity at temperatures from about 650 to 1000oC. SOFCs offer certain advantages over lower temperature fuel cells, notably ability to use CO as a fuel rather than being poisoned by it, and high grade exhaust heat for combined heat and power, or combined cycle gas turbine applications. This paper reviews the operating principle, materials for different cell and stack components, cell designs, and applications of SOFCs. Among different designs of solid oxide fuel cells (SOFCs), the electrical resistance of tubular SOFCs is high, and areal power density (W/cm2) and volumetric power density (W/cm3) low. Planar SOFCs, in contrast, are capable of achieving very high power densities.

Download Full-text

Brittle Fracture Studies of Solid Oxide Fuel Cells

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.409.81 ◽

2009 ◽

Vol 409 ◽

pp. 81-93

Author(s):

Jürgen Malzbender ◽

Rolf W. Steinbrech ◽

Egbert Wessel

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Glass Ceramics ◽

Solid Oxide ◽

Oxide Fuel ◽

Lanthanum Strontium Manganite ◽

Decentralized Energy ◽

Ysz Electrolyte ◽

Power Densities

Solid Oxide Fuel Cells (SOFCs) with electrical efficiencies above 50 % are considered as very promising option for future decentralized energy conversion. At the Forschungszentrum Juelich (FZJ) planar SOFC stacks are currently being developed and tested at 800°C and up to 10000 h using H2 and methane as fuel. Stacks in the kW class routinely reach power densities of 700 W/cm². Typically the layered material composite of the FZJ-stack consists of cells with yttria stabilized zirconia (YSZ) electrolyte, Ni-YSZ anode and a cathode of lanthanum strontium manganite. The cells are mounted between ferritic steel interconnects. The fuel and air compartment are sealed by glass-ceramics and more recently also by metal brazes. Significant progress in reliable stack operation has been achieved over the past decade. However, problems with thermo-chemical and thermo-mechanical compatibility still remain a major challenge. To illustrate the complexity of material interactions in SOFCs, selected problems related to mechanical failure processes are presented. The role of residual stresses is addressed and fracture phenomena of cell and sealant are described in greater detail.

Download Full-text

Zr and Y co-doped perovskite as a stable, high performance cathode for solid oxide fuel cells operating below 500 °C

Energy & Environmental Science ◽

10.1039/c6ee01915c ◽

2017 ◽

Vol 10 (1) ◽

pp. 176-182 ◽

Cited By ~ 112

Author(s):

Chuancheng Duan ◽

David Hook ◽

Yachao Chen ◽

Jianhua Tong ◽

Ryan O'Hayre

Keyword(s):

Fuel Cells ◽

Low Temperature ◽

Solid Oxide Fuel Cells ◽

High Performance ◽

Solid Oxide ◽

Oxide Fuel ◽

Stable Performance ◽

First Time ◽

Power Densities ◽

Co Doped

BaCo0.4Fe0.4Zr0.1Y0.1O3−δis applied for the first time as a cathode for low-temperature solid oxide fuel cells (LT-SOFCs) with high power densities below 500 °C and 2500 hours stable performance.

Download Full-text

High performance of microtubular solid oxide fuel cells using Nd2NiO4+δ-based composite cathodes

Journal of Materials Chemistry A ◽

10.1039/c4ta00665h ◽

2014 ◽

Vol 2 (25) ◽

pp. 9764-9770 ◽

Cited By ~ 37

Author(s):

Miguel A. Laguna-Bercero ◽

Amir R. Hanifi ◽

Hernán Monzón ◽

Joshua Cunningham ◽

Thomas H. Etsell ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

High Performance ◽

Solid Oxide ◽

Maximum Power ◽

Alternative Solution ◽

Oxide Fuel ◽

Composite Cathodes ◽

Power Densities

Cathodes of porous YSZ supports infiltrated with Nd2NiO4+δ nanoparticles are offered as an alternative solution for IT-SOFC cathodes, presenting maximum power densities of 0.4 W cm−2 at 600 °C.

Download Full-text