Continuous-time random-walk theory of interfering diffusion and chemical reaction with an application to electrochemical impedance spectra of oxidized Zr–1%Nb

2005 ◽  
Vol 123 (9) ◽  
pp. 094704 ◽  
Author(s):  
Robert Schiller ◽  
János Balog ◽  
Gabor Nagy
Keyword(s):  
Random Walk ◽  
Chemical Reaction ◽  
Continuous Time ◽  
Electrochemical Impedance ◽  
Continuous Time Random Walk ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Random Walk Theory

Unique fitting of electrochemical impedance spectra by random walk Metropolis Hastings algorithm

2018 ◽  
Vol 403 ◽  
pp. 184-191 ◽  
Author(s):  
Kazuaki Kawahara ◽  
Ryo Ishikawa ◽  
Takuma Higashi ◽  
Teiichi Kimura ◽  
Yumi H. Ikuhara ◽  
...  
Keyword(s):  
Random Walk ◽  
Electrochemical Impedance ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Random Walk Metropolis

Modeling of Line Shapes using Continuous Time Random Walk Theory

2010 ◽  
Author(s):  
H. Capes ◽  
M. Christova ◽  
D. Boland ◽  
A. Bouzaher ◽  
F. Catoire ◽  
...  
Keyword(s):  
Random Walk ◽  
Continuous Time ◽  
Continuous Time Random Walk ◽  
Line Shapes ◽  
Random Walk Theory

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.

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