Identification and modelling of the oxygen gas diffusion impedance in SOFC porous electrodes: application to Pr2NiO4+δ

2015 ◽  
Vol 174 ◽  
pp. 1030-1040 ◽  
Author(s):  
A. Flura ◽  
C. Nicollet ◽  
S. Fourcade ◽  
V. Vibhu ◽  
A. Rougier ◽  
...  
Keyword(s):  
Gas Diffusion ◽  
Porous Electrodes ◽  
Oxygen Gas ◽  
Diffusion Impedance

scholarly journals Metallic Porous Electrodes Enable Efficient Bicarbonate Electrolysis

2020 ◽  
Author(s):  
Zishuai Zhang ◽  
Faezeh Habibzadeh ◽  
Danielle A. Salvatore ◽  
Shaoxuan Ren ◽  
Eric W. Lees ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Performance Metrics ◽  
Flow Cell ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Free Standing ◽  
Faradaic Efficiency ◽  
Performance Loss ◽  
Bicarbonate Solutions ◽  
Porous Silver

We demonstrate here that a porous free-standing silver foam cathode in an electrolytic flow cell mediates efficient electrolysis of 3.0 M bicarbonate solutions into CO. These results have direct implications for carbon capture schemes where OH- solutions react with CO2 to form bicarbonate-rich solutions that need to be treated to recycle the sorbent and recover the CO2. Our study shows a viable path for replacing the high-temperature thermal process currently used to recover CO2 from these carbon capture solutions by using electricity to drive the conversion of bicarbonate into CO2 and subsequently into CO. The use of free-standing porous silver electrodes was found to yield electrolysis performance parameters (e.g., a Faradaic efficiency for CO production, FECO, of 78% at 100 mA cm2; <3% performance loss after 80 h operation) that are superior to results obtained in bicarbonate electrolyzers that utilize conventional carbon-based gas diffusion electrodes (GDEs) designed for gaseous CO2 fed electrolyzers. These performance metrics are comparable to any electrolytic flow cell fed directly with a CO2 feedstock, with the added benefit of not requiring an energy-intensive pressurization step that would be necessary for the electrolysis of gaseous CO2. These findings represent a potentially important step in closing the carbon cycle.

scholarly journals Modeling of oxygen gas diffusion and consumption during the oxic transient in a disposal cell of radioactive waste

2014 ◽  
Vol 41 ◽  
pp. 115-127 ◽  
Author(s):  
Laurent De Windt ◽  
François Marsal ◽  
Jérôme Corvisier ◽  
Delphine Pellegrini
Keyword(s):  
Radioactive Waste ◽  
Gas Diffusion ◽  
Oxygen Gas

Numerical Simulation of SOFC Performance Affected by Cathode Mesoscale-Structure Control

2008 ◽  
Author(s):  
Akio Konno ◽  
Hiroshi Iwai ◽  
Motohiro Saito ◽  
Hideo Yoshida
Keyword(s):  
Numerical Simulation ◽  
Current Density ◽  
Porous Electrode ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Cell Performance ◽  
Structure Control ◽  
Mesoscale Structures ◽  
Mesoscale Structure ◽  
Electrolyte Interface

Increase of the current density is one of the most important topics in the development of solid oxide fuel cells. In this study we focus on the possibility of the current density enhancement by controlling the mesoscale structure of the electrodes. Modifications of the mesoscale structures increase the area of electrode-electrolyte interface and the volume of the electrode, reduce the electrolyte thickness, affect gas diffusion in the porous electrode and consequently influence the cell performance. To evaluate its effect on the cell performance, two-dimensional numerical simulation for SOFC with and without mesoscale grooves on the cathode-electrolyte interface is conducted to understand the effects of such cathode mesoscale structure on the cell performance. It is found that the electrochemical reaction in porous electrodes takes place in the region close to the electrode-electrolyte interface and the cell performance can be improved by applying cathode mesoscale structures.

Studies into design and operation of microbial fuel cells using oxygen gas diffusion electrodes

2017 ◽  
Vol 91 ◽  
pp. 222-227
Author(s):  
A.-L. Schneider ◽  
H. Schell ◽  
S. Hild ◽  
K.-M. Mangold ◽  
A. Tiehm
Keyword(s):  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Gas Diffusion ◽  
Gas Diffusion Electrodes ◽  
Oxygen Gas

Modeling Oxygen Gas Diffusion Electrodes for Various Technical Applications

2019 ◽  
Vol 91 (6) ◽  
pp. 720-733 ◽  
Author(s):  
Fabian Kubannek ◽  
Thomas Turek ◽  
Ulrike Krewer
Keyword(s):  
Gas Diffusion ◽  
Gas Diffusion Electrodes ◽  
Oxygen Gas

Effect of Non-Uniform Electrode Microstructure in Gas Diffusion Impedance

2015 ◽  
Vol 68 (1) ◽  
pp. 2897-2905 ◽  
Author(s):  
A. Bertei ◽  
G. Arcolini ◽  
C. Nicolella ◽  
P. Piccardo
Keyword(s):  
Gas Diffusion ◽  
Diffusion Impedance
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