Compositional Effect of Thin Electrode Functional Layers on the Performance of Solid Oxide Fuel Cells

2011 ◽  
Vol 8 (6) ◽  
Author(s):  
Hyeon-Cheol Park ◽  
Fatih Dogan
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Electrode Materials ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Functional Layer ◽  
Ohmic Resistance ◽  
Anode Support ◽  
The Relationship ◽  
Power Densities

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.

Fabrication and Power Densities of Anode-Supported Solid Oxide Fuel Cells with Different Ni-YSZ Anode Functional Layer Thicknesses

Fuel Cells ◽  
2014 ◽  
Vol 15 (1) ◽  
pp. 90-97 ◽  
Author(s):  
I. Kagomiya ◽  
S. Kaneko ◽  
K. Kakimoto ◽  
K. Park ◽  
K.H. Cho
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Functional Layer ◽  
Power Densities

scholarly journals Synthesis of Octahedral-Shaped NiO and Approaches to an Anode Material of Manufactured Solid Oxide Fuel Cells Using the Decalcomania Method

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Haeran Cho ◽  
Huryul Lee ◽  
Sun-Min Park ◽  
Byung-Hyun Choi ◽  
Misook Kang
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Anode Material ◽  
Solid Oxide ◽  
Maximum Power ◽  
Oxide Fuel ◽  
Functional Layer ◽  
Sem Image ◽  
Ysz Electrolyte ◽  
Anode Support

Micrometer-sized and octahedral-shaped NiO particles were synthesized by microwave thermal treatment at 300 watt power for 15 min in a microwave chamber to be used as an anode material in solid oxide fuel cells. SEM image and particle size distribution revealed near-perfect octahedral NiO microparticle with sizes ranging from 4.0~11.0 μm. The anode functional layer (AFL, 60 wt% NiO synthesized: commercial 40 wt% YSZ), electrolyte (commercial Yttria-stabilized zirconia, YSZ), and cathode (commercial La0.8Sr0.2MnO3, LSM) layers were manufactured using the decalcomania method on a porous anode support, sequentially. The sintered electrolyte at 1450°C for 2 h using the decalcomania method was dense and had a thickness of about 10 μm. The cathode was sintered at 1250°C for 2 h, and it was porous. Using humidified hydrogen as a fuel, a coin cell with a 15 μm thick anode functional layer exhibited maximum power densities of 0.28, 0.38, and 0.65 W/cm2at 700, 750, and 800°C, respectively. Otherwise, when a commercial YSZ anode functional layer was used, the maximum power density was 0.55 W/cm2at 800°C.

Controlling Porosity of Anode Support in Tubular Solid Oxide Fuel Cells by Freeze Casting

2020 ◽  
Vol 17 (4) ◽  
Author(s):  
Benjamin Emley ◽  
Dhruba Panthi ◽  
Yanhai Du ◽  
Yan Yao
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Concentration Polarization ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Freeze Casting ◽  
Lanthanum Strontium Manganite ◽  
Functional Layer ◽  
Anode Support

Abstract Precise porosity control is highly desirable for improving the electrochemical performance of solid oxide fuel cells (SOFCs). Freeze casting is an established method for enabling high bulk porosity in structures and controlling pore orientation. In this study, freeze casting was used to fabricate tubular, anode-supported SOFCs with aligned and varying amounts of porosity by controlling the solids/water ratio in different casting slurries. SOFCs were prepared with a Ni/yttria and scandia stabilized zirconia (ScYSZ) anode support (AS), an anode functional layer (AFL), a ScYSZ electrolyte, a lanthanum strontium manganite (LSM)/ScYSZ cathode interlayer (CIL), and an LSM cathode. The permeability of the anode support was found to increase from 1.4 × 10−2 to 1.8 × 10−2 m2 as porosity was increased from 57 to 64 vol%, while the total cell resistance decreased by 35% from 0.93 to 0.60 Ohm cm2. When evaluated with 30 vol% H2 as the fuel at 800 °C, the decrease of concentration polarization enabled an increase in electrochemical performance by 42% from 0.35 to 0.50 W/cm2 as the porosity in the anode support was increased. Mechanical strength characterization using a three-point method showed there is a practical upper limit of the amount of porosity that can be designed into the anode support. This work paves a way for controlling porosity by freeze casting and understanding the correlation between porosity and concentration polarization losses in SOFCs.

Effect of an Anode Functional Layer on Cell Performance of Anode-Supported Solid Oxide Fuel Cells by a Decalcomania Method

2013 ◽  
Vol 51 (2) ◽  
pp. 125-130 ◽  
Author(s):  
Sun-Min Park ◽  
Hae-Ran Cho ◽  
Byung-Hyun Choi ◽  
Yong-Tae An ◽  
Ja-Bin Koo ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Cell Performance ◽  
Oxide Fuel ◽  
Functional Layer

Scalable fabrication process of thin-film solid oxide fuel cells with an anode functional layer design and a sputtered electrolyte

2020 ◽  
Vol 45 (58) ◽  
pp. 33980-33992 ◽  
Author(s):  
Sungmin Kang ◽  
Jaeseok Lee ◽  
Gu Young Cho ◽  
Yusung Kim ◽  
Sanghun Lee ◽  
...  
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Fabrication Process ◽  
Oxide Fuel ◽  
Functional Layer

Microstructure, Sinterability and Electrochemical Properties of a Sm-Sr-(Co,Fe,Ni)-O Cathode System for Solid Oxide Fuel Cells

2009 ◽  
Author(s):  
Seung-Wook Baek ◽  
Joongmyeon Bae
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Electrochemical Properties ◽  
Electrochemical Impedance ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Sofc Cathode ◽  
Low Thermal Expansion ◽  
Temperature Operating ◽  
The Relationship

Samarium (Sm) is a rare earth material that shows promise for use in cathodes of intermediate temperature-operating solid oxide fuel cells (IT-SOFCs). Perovskite-structured oxide containing Sm has very attractive electrocatalytic properties, and spinel-structured oxide generally exhibits low thermal expansion, indicating its suitability for application as a SOFC cathode. In this paper, the characteristics of the various Sm-based oxide materials (Sm-Sr-(Co,Fe,Ni)-O) deposited on Sm0.2Ce0.8O1.9 (SDC) electrolyte pellets were investigated in terms of their microstructure, sinterability and electrochemical properties. The relationship between the composition and the sintering temperature was studied and discussed. Results show that the substitution of iron (Fe) and nickel (Ni) in Co-sites affects the sinterability, adhesion to the electrolyte and electrochemical activity, such that the different sintering temperatures for these compositions should be considered. The microstructure and sinterability of the cathodes were investigated using a scanning electron microscope (SEM). Area specific resistance (ASR) values for all cathode compositions were measured using AC electrochemical impedance spectroscopy (EIS).

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