scholarly journals Analysis of La4Ni3O10±δ-BaCe0.9Y0.1O3-δ Composite Cathodes for Proton Ceramic Fuel Cells

2021 ◽  
Vol 11 (8) ◽  
pp. 3407
Author(s):  
Francisco J. A. Loureiro ◽  
Devaraj Ramasamy ◽  
Vanessa C. D. Graça ◽  
Laura I. V. Holz ◽  
Sergey M. Mikhalev ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Electronic Conductivity ◽  
Relaxation Times ◽  
Composite Cathode ◽  
Conducting Phase ◽  
Proton Conducting ◽  
Impedance Data ◽  
Composite Cathodes

Layered Ruddlesden-Popper (RP) lanthanide nickelates, Lnn+1NinO3n+1 (Ln = La, Pr, and Nd; n = 1, 2, and 3) have generated great interest as potential cathodes for proton conducting fuel cells (PCFCs). The high-order phase (n = 3) is especially intriguing, as it possesses the property of a high and metallic-type electronic conductivity that persists to low temperatures. To provide the additional requirement of high ionic conductivity, a composite electrode is here suggested, formed by a combination of La4Ni3O10±δ with the proton conducting phase BaCe0.9Y0.1O3-δ (40 vol%). Electrochemical impedance spectroscopy (EIS) is used to analyse this composite electrode in both wet (pH2O ~ 10−2 atm) and low humidity (pH2O ~ 10−5 atm) conditions in an O2 atmosphere (400–550 °C). An extended analysis that first tests the stability of the impedance data through Kramers-Kronig and Bayesian Hilbert transform relations is outlined, that is subsequently complemented with the distribution function of relaxation times (DFRTs) methodology. In a final step, correction of the impedance data against the short-circuiting contribution from the electrolyte substrate is also performed. This work offers a detailed assessment of the La4Ni3O10±δ-BaCe0.9Y0.1O3-δ composite cathode, while providing a robust analysis methodology for other researchers working on the development of electrodes for PCFCs.

Oxygen reduction reaction over (Ba,Sr)6RE2Co4O15–Ba(Ce,Pr,Y)O3 composite cathodes for proton-conducting ceramic fuel cells

2021 ◽  
Author(s):  
Toshiaki Matsui ◽  
Naoki Kunimoto ◽  
Kohei Manriki ◽  
Kazunari Miyazaki ◽  
Naoto Kamiuchi ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Reaction Mechanism ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Composite Cathode ◽  
Reduction Reaction ◽  
Proton Conducting ◽  
Composite Cathodes ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

The oxygen reduction reaction mechanism on the Ba5SrGd2Co4O15–BaCe0.5Pr0.3Y0.2O3−δ (BSGC–BCPY) composite cathode for proton-conducting fuel cells.

Performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Ag Composite Cathode Materials for IT-SOFCs

2011 ◽  
Vol 311-313 ◽  
pp. 2309-2314 ◽  
Author(s):  
Wen Xia Zhu ◽  
Zhe Lü ◽  
Le Xin Wang ◽  
Xiao Yan Guan ◽  
Xin Yan Zhang
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electrochemical Impedance ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Electrode Polarization ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Composite Cathodes ◽  
Reduced Temperature ◽  
Resistance Value

°Abstract. In order to develop new cathodes for reduced temperature SOFCs, Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Ag composite cathode was investigated in intermediate-temperature Solid Oxide Fuel Cells (IT-SOFCs). The XRD results suggested that no chemical reactions between BSCF and Ag in the composite cathode were found. The resistance measurements showed that the addition of Ag into BSCF improved electrical conductivity of pure BSCF, and the improved conductivity resulted in attractive cathode performance. In addition, electrochemical impedance spectra exhibited the better performance of BSCF-Ag composite cathodes than pure BSCF, e.g., the polarization resistance value of BSCF-Ag was only 0.36Ω cm2 at 650°C, which was nearly 80% lower than that of BSCF electrode. Polarization curves showed the overpotential decreased with the addition of Ag. The current density value of BSCF-Ag was 0.88Acm-2 under –120mV, about five times of that BSCF measured at 650°C. As a summary, compared to a pure BSCF cathode, it was found that adding Ag in the cathode enhanced the BSCF performance significantly.

scholarly journals Ba0.5Sr0.5Co0.8Fe0.2O3–δ–La0.6Sr0.4Co0.8Fe0.2O3–δ Composite Cathode for Solid Oxide Fuel Cell

2016 ◽  
Vol 61 (3) ◽  
pp. 1483-1488 ◽  
Author(s):  
M. Mosiałek ◽  
A. Kędra ◽  
M. Krzan ◽  
E. Bielańska ◽  
M. Tatko
Keyword(s):  
Electrochemical Impedance ◽  
Specific Resistance ◽  
Weight Ratio ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Composite Cathodes ◽  
Area Specific Resistance ◽  
Ceria Electrolyte

Abstract Composite cathodes contain Ba0.5Sr0.5Co0.8Fe0.2O3–δ and La0.6Sr0.4Co0.8Fe0.2O3–δ were tested in different configuration for achieving cathode of area specific resistance lower than Ba0.5Sr0.5Co0.8Fe0.2O3–δ and La0.6Sr0.4Co0.8Fe0.2O3–δ cathodes. Electrodes were screen printed on samaria-doped ceria electrolyte half-discs and tested in the three electrode setup by the electrochemical impedance spectroscopy. Microstructure was observed by scanning electron microscopy. The lowest area specific resistance 0.46 and 2.77 Ω cm−2 at 700 °C and 600 °C respectively revealed composite cathode contain Ba0.5Sr0.5Co0.8Fe0.2O3–δ and La0.6Sr0.4Co0.8Fe0.2O3–δ in 1:1 weight ratio. The area specific resistance of this cathode is characterized by the lowest activation energy among tested cathodes.

Novel triple-phase composite cathode materials for proton-conducting solid oxide fuel cells

2012 ◽  
Vol 206 ◽  
pp. 47-52 ◽  
Author(s):  
Qiumei Jiang ◽  
Jigui Cheng ◽  
Rui Wang ◽  
Yumeng Fan ◽  
Jianfeng Gao
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Cathode Materials ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Proton Conducting

Olivine electrode engineering impact on the electrochemical performance of lithium-ion batteries

2010 ◽  
Vol 25 (8) ◽  
pp. 1656-1660 ◽  
Author(s):  
Wenquan Lu ◽  
Andrew Jansen ◽  
Dennis Dees ◽  
Gary Henriksen
Keyword(s):  
Hybrid Electric Vehicle ◽  
Composite Electrode ◽  
Lithium Iron Phosphate ◽  
Electrochemical Impedance ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
High Energy ◽  
Discharge Performance ◽  
Energy And Power Density

High energy and power density lithium iron phosphate was studied for hybrid electric vehicle applications. This work addresses the effects of porosity in a composite electrode using a four-point probe resistivity analyzer, galvanostatic cycling, and electrochemical impedance spectroscopy (EIS). The four-point probe result indicates that the porosity of composite electrode affects the electronic conductivity significantly. This effect is also observed from the cell's pulse current discharge performance. Compared to the direct current (dc) methods used, the EIS data are more sensitive to electrode porosity, especially for electrodes with low porosity values.

(La, Pr)0.8Sr0.2FeO3−–Sm0.2Ce0.8O2− composite cathode for proton-conducting solid oxide fuel cells

2014 ◽  
Vol 39 (25) ◽  
pp. 13665-13670 ◽  
Author(s):  
Yonghong Chen ◽  
Qingwen Gu ◽  
Dong Tian ◽  
Yanzhi Ding ◽  
Xiaoyong Lu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Proton Conducting
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