scholarly journals Comparison of different infiltration amounts of CeO2 inside Ni-YSZ anodes to improve stability and efficiency of Single-Chamber SOFCs operating in methane

2022 ◽  
Vol 334 ◽  
pp. 04009
Author(s):  
Giovanni d’Andrea ◽  
Enrico Squizzato ◽  
Antonella Glisenti
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Solid Electrolytes ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Oxygen Mixture ◽  
Gas Mixture ◽  
Single Chamber ◽  
Electrochemically Active ◽  
Area Specific Resistance ◽  
Improve Stability

Electrochemically active oxide-based anodes capable of working in Single-Chamber Solid Oxide Fuel Cells (SC-SOFCs) were developed. Their performance is related to the selectivity of the electrodes. Tests are carried out on lab-scale devices with YSZ pellets as solid electrolytes in electrolyte supported cells. Selecting methane as a fuel, a gas mixture in the ratio CH4/O2 = 2 was chosen. The Ni-YSZ (NiO:YSZ=60:40) anode was optimized through CeO2 nanocatalysts infiltration to enhance the anode catalytic activity and make its reduction easier. Several infiltration amounts were compared, from null to 15% of the electrode weight. Both symmetric and complete cells (with LSCF-based cathodes) were tested in H2 and CH4/O2. For increasing amounts of infiltrated CeO2, symmetric cells tests describe an area specific resistance (ASR) reduction from 40 Ω cm2 to 1.7 Ω cm2 in hydrogen and from 11 Ω cm2 to 3.9 Ω cm2 in the methane/oxygen mixture. While complete cells tests displayed an ASR drop from 30 Ω cm2 to 2.9 Ω cm2 in H2, and from 8.7 Ω cm2 to 4.3 Ω cm2 in the methane/oxygen mixture, while OCP and power grew from 478 mV and 3.7 mW cm-2 to 766 mV and 13 mW cm-2.

Polarization Resistances of (Ln1−xSrx)CoO3 (Ln=Pr, Nd, Sm, and Gd x=0, 0.3, 0.5, 0.7, and 1) as Cathode Materials for Intermediate Temperature-operating Solid Oxide Fuel Cells

2009 ◽  
Vol 6 (3) ◽  
Author(s):  
Jung Hyun Kim ◽  
Seung-Wook Baek ◽  
Joongmyeon Bae
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Cathode Materials ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Temperature Operating ◽  
Polarization Resistances ◽  
Area Specific Resistance

This study focuses on cathode performances of (Ln1−xSrx)CoO3−δ (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1) for intermediate temperature-operating solid oxide fuel cells (IT-SOFCs, 600–800°C). (Ln1−xSrx)CoO3−δ powders as cathode materials for IT-SOFC, which can be operated between 600°C and 800°C were synthesized by the glycine-nitrate-process (GNP) method. The impedance spectroscopy method was used to investigate area specific resistance (ASR) and electrochemical properties of (Ln1−xSrx)CoO3−δ (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1). Pr0.5Sr0.5CoO3−δ and Pr0.3Sr0.7CoO3−δ showed to 0.15 Ω cm2 of ASR at 700°C and Nd0.5Sr0.5CoO3−δ to 0.14 Ω cm2 at 700°C. Sm0.5Sr0.5CoO3−δ showed the lowest ASR values of 0.10 Ω cm2 on 10% Gd-doped cerium oxide at 700°C.

scholarly journals Cr Poisoning On Nd2Ni0.95Cu0.05O4+δ Cathode for Solid Oxide Fuel Cells

2016 ◽  
Vol 61 (2) ◽  
pp. 629-634 ◽  
Author(s):  
Yeong-Ju Choe ◽  
Kyoung-Jin Lee ◽  
Hae-Jin Hwang
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Layered Perovskite ◽  
Oxide Fuel ◽  
Chromium Species ◽  
Poisoning Effect ◽  
Chromium Poisoning ◽  
Area Specific Resistance ◽  
Additional Phase

Abstract In this study, Nd2Ni1-xCuxO4+δ (x=0, 0.05, 0.1, and 0.2) layered perovskite powders were synthesized by the glycine nitrate process (GNP) and the chromium poisoning effect on the electrochemical performance of the Nd2Ni0.95Cu0.05O4+δ and La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes were investigated. In the case of the LSCF cathode, the strontium chromite phase formed after the exposure of the gaseous chromium species, while there was no additional phase in the Nd2Ni0.95Cu0.05O4+δ cathode. The area specific resistance (ASR) of the Nd2Ni0.95Cu0.05O4+δ cathode did not change significantly after the exposure of the gaseous chromium species at 800°C.

Effect of Ce0.8Sm0.2O1.9 Interlayer on the Electrochemical Performance of LaBaCo2O5+δ Cathode for IT-SOFCs

2013 ◽  
Vol 423-426 ◽  
pp. 532-536
Author(s):  
Rui Feng Li ◽  
Shou Cheng He ◽  
Lu Cun Guo
Keyword(s):  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Screen Printing ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Screen Printing Method ◽  
Cathodic Overpotential ◽  
Area Specific Resistance ◽  
A Current ◽  
Printing Method

The Ce0.8Sm0.2O1.9(SDC) interlayer was prepared by screen-printing method between LaBaCo2O5+δ(LBCO) cathode and 8YSZ electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The effect of SDC interlayer on the electrochemical performance of LBCO cathode was investigated. Experimental results showed that the LBCO cathode with SDC interlayer showed much lower area-specific resistance (ASR) and polarization overpotential than that of LBCO cathode without SDC interlayer at the same test condition, exhibiting the better electrochemical performance. For LBCO cathode with SDC interlayer, the ASR was 0.457 Ωcm2at 800 °C in air, about 36.2 % lower than that of the LBCO cathode without SDC interlayer, and the cathodic overpotential was reduced by 38.0 % at a current density of 0.02 Acm-2at 700 °C in air. The application of a thin-layer SDC interlayer between cathode and dense 8YSZ electrolyte showed great potential in improving the cathode performance for IT-SOFCs.

Long-Term Electric Conductivity of (Nb,Y)-Doped Bi2O3 Solid Electrolytes for Solid Oxide Fuel Cells

2012 ◽  
Vol 509 ◽  
pp. 111-113 ◽  
Author(s):  
Wen Cheng J. Wei
Keyword(s):  
Phase Transformation ◽  
Solid Oxide Fuel Cells ◽  
Electric Conductivity ◽  
Solid Electrolytes ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Surface Evaporation ◽  
Delta Phase ◽  
Phase Retention

Two oxides, Y2O3 and Nb2O5, were doped into Bi2O3-based electrolyte in a composition of (Bi 1-x-y,Nb x,Y y)2O 3, where (x+y)=0.12 to 0.2 and the x:y ratio 3:1 to 1:3. The delta-phase retention, the oxygen vacancy order-disorder transformation, the ionic and electric conductivity were investigated by various techniques. The long-term conductivity of the dense electrolytes was determined showing moderate degradation due to phase transformation possible triggered by surface evaporation of Bi-oxide. The best retention of the conductivity is about 60% after 300 hr test.

Sign in / Sign up

Export Citation Format

Share Document