Peak Power Optimization of Solid Oxide Fuel Cells with Particle Size and Porosity Grading

2014 ◽  
Vol 61 (13) ◽  
pp. 33-46 ◽  
Author(s):  
T. Abdullah ◽  
L. Liu
Keyword(s):  
Particle Size ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Peak Power ◽  
Power Optimization ◽  
Solid Oxide ◽  
Oxide Fuel

scholarly journals Surface engineering of nanoporous substrate for solid oxide fuel cells with atomic layer-deposited electrolyte

2015 ◽  
Vol 6 ◽  
pp. 1805-1810 ◽  
Author(s):  
Sanghoon Ji ◽  
Waqas Hassan Tanveer ◽  
Wonjong Yu ◽  
Sungmin Kang ◽  
Gu Young Cho ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Peak Power ◽  
Surface Engineering ◽  
Bottom Electrode ◽  
Atomic Layer ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Active Mass ◽  
Anodic Aluminum

Solid oxide fuel cells with atomic layer-deposited thin film electrolytes supported on anodic aluminum oxide (AAO) are electrochemically characterized with varying thickness of bottom electrode catalyst (BEC); BECs which are 0.5 and 4 times thicker than the size of AAO pores are tested. The thicker BEC ensures far more active mass transport on the BEC side and resultantly the thicker BEC cell generates ≈11 times higher peak power density than the thinner BEC cell at 500 °C.

Direct-Write Microfabrication of Single-Chamber Solid Oxide Fuel Cells with Interdigitated Electrodes

2006 ◽  
Vol 972 ◽  
Author(s):  
Melanie Kuhn ◽  
Teko Napporn ◽  
Michel Meunier ◽  
Daniel Therriault ◽  
Srikar Vengallatore
Keyword(s):  
Particle Size ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cells ◽  
Size Distribution ◽  
Solid Oxide ◽  
Extrusion Pressure ◽  
Direct Write ◽  
Oxide Fuel ◽  
Single Chamber

AbstractMiniaturized single-chamber solid-oxide fuel cells (SC-SOFC) are a promising class of devices for portable power generation required in the operation of distributed networks of microelectromechanical systems (MEMS) in harsh environments. The single-face configuration, which consists of interdigitated (comb-like) array of electrodes on an yttria-stabilized zirconia (YSZ) electrolyte substrate, is of particular interest because of the ease of high-temperature microfluidic packaging and integration with MEMS. The primary design consideration for this configuration is the minimization of electrode widths and inter-electrode spacings to dimensions on the order of a few micrometers. This is necessary to minimize polarization resistance and increase fuel cell efficiency. Achieving these geometries using standard microfabrication methods is difficult because of the thickness, porosity, and complex chemistries of the electrodes. Here, we report the development of an innovative and rapid method for manufacturing SC-SOFCs with interdigitated electrodes using robot-controlled direct-writing. The main steps consist of: (i) formation of inks (or suspensions) using anode (NiO-YSZ) and cathode (lanthanum strontium manganite) powders, (ii) pressure-driven extrusion of inks through a micronozzle using a robot-controlled platform, and (iii) sequential sintering to form the fuel cell. The first-generation SC-SOFC device, with electrode widths of 130 μm and inter-electrode spacing of 300 μm, has been manufactured using direct-write microfabrication. The electrodes have been extensively characterized using electron microscopy and x-ray diffraction to assess porosity and to confirm phase identity. The primary process parameters in this approach are the particle size and size distribution, rheological properties of the suspension, extrusion pressure, nozzle size, stage velocity, and sintering conditions. As the first step in the development of detailed process-structure-performance correlations for the fuel cells, we have studied the effects of extrusion pressure (in the range 30-40 bar) and stage velocity (in the range 0.2-2.0 mm/s) on the geometry and size of electrodes, for fixed suspension viscosity and nozzle diameter. An optimal combination of speed and pressure has been identified and catalogued in the form of process maps. Similarly, the particle size distribution of the anode and cathode powders is found to have a significant effect on the microstructure, especially porosity, of the sintered electrodes. The implications of these results for the design of the next generation of SC-SOFC, with reduced electrode dimensions and improved electrochemical performance, will be discussed.

SFA-SDC Composite Cathodes Fabricated with Glycine-Nitrate Process for Intermediate-Temperature Solid Oxide Fuel Cells

2014 ◽  
Vol 1070-1072 ◽  
pp. 488-491
Author(s):  
Xiu Ling Yu ◽  
Ming Fei Shi
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Power Density ◽  
Peak Power ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Reaction Products ◽  
Mass Content ◽  
Composite Cathodes

SrFe0.9Al0.1O3-δ(SFA) powder was mixed with a different mass content of SDC 10, 20 and 30 wt.% to form SFA-SDC composite cathodes subsequently investigated as potential IT-SOFC cathodes on LSGM electrolytes. No obvious reaction products between SDC (or LSGM) and SFA occur under test for the cathode of SOFCs. As SOFC cathodes, the area-specific resistances of the SFA-SDC cathodes on the LSGM electrolyte with SDC 10, 20 and 30 wt.% at 800 oC are 0.089, 0.068 and 0.087 Ω cm2, respectively. The peak power density of the SFA-SDC20 on a 300 μm-thick LSGM electrolyte reach 512 mW cm−2 at 800 °C.

scholarly journals Effect of dopants [Gd3+, Sm3+, Ca2+, Sr2+ and Ba2+] on the performance characteristics of ceria based electrolytes for application in solid oxide fuel cells

2014 ◽  
Vol 10 (2) ◽  
Author(s):  
M.L. Reni ◽  
A. Samson Nesaraj
Keyword(s):  
Particle Size ◽  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Average Particle Size ◽  
Solid Oxide ◽  
Narrow Particle Size Distribution ◽  
Average Particle ◽  
Doped Ceria ◽  
Oxide Fuel

Doped CeO2 based materials are now-a-days proposed as alternate electrolyte materials for solid oxide fuel cells (SOFCs) working at low temperature (~723 – 873 K). In this research work, nanoparticles of CeO2 doped with Gd3+, Sm3+, Ca2+, Sr2+ and Ba2+were prepared by a simple homogeneous chemical precipitation method. The prepared materials (after heat treatment at 1023 K for 2 hours) were systematically characterized by XRD, EDAX analysis, FTIR , particle size analysis and SEM.  Lattice parameters were calculated from the XRD data. The XRD results indicate that all the doped ceria samples studied are single phase with a cubic fluorite structure. The average particle size of the doped ceria powder was about 48 – 115 nm and the particles have shown narrow particle size distribution patterns. AC impedance spectroscopy studies performed on the sintered specimens have shown better oxide ion conductivity values and hence these materials may be suitable for application as electrolyte materials in solid oxide fuel cells working at low temperature (~723 – 873 K). ________________________________________GRAPHICAL ABSTRACT

Modeling of Solid Oxide Fuel Cells with Particle Size and Porosity Grading in Anode Electrode

Fuel Cells ◽  
2012 ◽  
Vol 12 (1) ◽  
pp. 97-108 ◽  
Author(s):  
L. Liu ◽  
R. Flesner ◽  
G.-Y. Kim ◽  
A. Chandra
Keyword(s):  
Particle Size ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Anode Electrode

Particle size dependence of polarization of Ni/YSZ cermet anodes for solid oxide fuel cells

2013 ◽  
Vol 234 ◽  
pp. 147-153 ◽  
Author(s):  
Tsuyoshi Kawashima ◽  
Shogo Miyoshi ◽  
Yasushi Shibuta ◽  
Shu Yamaguchi
Keyword(s):  
Particle Size ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Size Dependence ◽  
Solid Oxide ◽  
Oxide Fuel
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