scholarly journals Electrode Kinetics of Porous Ni-3YSZ Cermet Operated in Fuel Cell and Electrolysis Modes for Solid Oxide Cell Application

2021 ◽  
pp. 138765
Author(s):  
F. Monaco ◽  
E. Effori ◽  
M. Hubert ◽  
E. Siebert ◽  
G. Geneste ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide ◽  
Electrode Kinetics ◽  
Solid Oxide Cell ◽  
Kinetics Of

Use Co- and Ni-Free Air Electrode in Solid Oxide Cell Manufacturing for Electrolysis and Fuel Cell Applications

2021 ◽  
Vol 103 (1) ◽  
pp. 581-590
Author(s):  
Claire Julie Ferchaud ◽  
Frans Berkel ◽  
Loek Berkeveld ◽  
Miranda Heijink-Smith ◽  
Jakobert Veldhuis ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide ◽  
Air Electrode ◽  
Cell Manufacturing ◽  
Free Air ◽  
Solid Oxide Cell

scholarly journals Kinetics of CO/CO2 and H2/H2O reactions at Ni-based and ceria-based solid-oxide-cell electrodes

2015 ◽  
Vol 182 ◽  
pp. 75-95 ◽  
Author(s):  
Christopher Graves ◽  
Christodoulos Chatzichristodoulou ◽  
Mogens B. Mogensen
Keyword(s):  
Phase Boundary ◽  
Porous Electrode ◽  
Relative Activity ◽  
Gas Diffusion ◽  
Solid Oxide ◽  
Electrode Kinetics ◽  
Electrode Polarization ◽  
Two Phase ◽  
Diffusion Limitations ◽  
Solid Oxide Cell

The solid oxide electrochemical cell (SOC) is an energy conversion technology that can be operated reversibly, to efficiently convert chemical fuels to electricity (fuel cell mode) as well as to store electricity as chemical fuels (electrolysis mode). The SOC fuel-electrode carries out the electrochemical reactions CO2 + 2e− ↔ CO + O2− and H2O + 2e− ↔ H2 + O2−, for which the electrocatalytic activities of different electrodes differ considerably. The relative activities in CO/CO2 and H2/H2O and the nature of the differences are not well studied, even for the most common fuel-electrode material, a composite of nickel and yttria/scandia stabilized zirconia (Ni–SZ). Ni–SZ is known to be more active for H2/H2O than for CO/CO2 reactions, but the reported relative activity varies widely. Here we compare AC impedance and DC current–overpotential data measured in the two gas environments for several different electrodes comprised of Ni–SZ, Gd-doped CeO2 (CGO), and CGO nanoparticles coating Nb-doped SrTiO3 backbones (CGOn/STN). 2D model and 3D porous electrode geometries are employed to investigate the influence of microstructure, gas diffusion and impurities. Comparing model and porous Ni–SZ electrodes, the ratio of electrode polarization resistance in CO/CO2vs. H2/H2O decreases from 33 to 2. Experiments and modelling suggest that the ratio decreases due to a lower concentration of impurities blocking the three phase boundary and due to the nature of the reaction zone extension into the porous electrode thickness. Besides showing higher activity for H2/H2O reactions than CO/CO2 reactions, the Ni/SZ interface is more active for oxidation than reduction. On the other hand, we find the opposite behaviour in both cases for CGOn/STN model electrodes, reporting for the first time a higher electrocatalytic activity of CGO nanoparticles for CO/CO2 than for H2/H2O reactions in the absence of gas diffusion limitations. We propose that enhanced surface reduction at the CGOn/gas two phase boundary in CO/CO2 and in cathodic polarization can explain why the highest reaction rate is obtained for CO2 electrolysis. Large differences observed between model electrode kinetics and porous electrode kinetics are discussed.

scholarly journals Methane Steam Reforming over an Ni-YSZ Solid Oxide Fuel Cell Anode in Stack Configuration

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
D. Mogensen ◽  
J.-D. Grunwaldt ◽  
P. V. Hendriksen ◽  
J. U. Nielsen ◽  
K. Dam-Johansen
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Steam Reforming ◽  
Solid Oxide ◽  
Methane Steam Reforming ◽  
Oxide Fuel ◽  
Methane Steam ◽  
Anode Support ◽  
Fuel Cell Anode ◽  
Kinetics Of

The kinetics of catalytic steam reforming of methane over an Ni-YSZ anode of a solid oxide fuel cell (SOFC) have been investigated with the cell placed in a stack configuration. In order to decrease the degree of conversion, a single cell stack with reduced area was used. Measurements were performed in the temperature range 600–800°C and the partial pressures of all reactants and products were varied. The obtained rates could be well fitted with a power law expression (r ∝PCH40.7). A simple model is presented which is capable of predicting the methane conversion in a stack configuration from intrinsic kinetics of the anode support material. The predictions are compared with the stack measurements presented here, and good agreement is observed.

A novel approach for analyzing electrochemical properties of mixed conducting solid oxide fuel cell anode materials by impedance spectroscopy

2014 ◽  
Vol 16 (40) ◽  
pp. 22321-22336 ◽  
Author(s):  
A. Nenning ◽  
A. K. Opitz ◽  
T. M. Huber ◽  
J. Fleig
Keyword(s):  
Thin Film ◽  
Fuel Cell ◽  
Anode Materials ◽  
Spectroscopic Method ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Novel Approach ◽  
Cell Anode ◽  
Fuel Cell Anode ◽  
Kinetics Of

A novel impedance spectroscopic method enables quantification of conductivity and kinetics of mixed conducting thin film SOFC electrodes.

scholarly journals Test Results From the Idaho National Laboratory of the NASA Bi-Supported Cell Design

2009 ◽  
Author(s):  
C. Stoots ◽  
J. O’Brien ◽  
T. Cable
Keyword(s):  
Fuel Cell ◽  
High Power ◽  
Large Scale ◽  
National Laboratory ◽  
Solid Oxide ◽  
Operating Voltage ◽  
Cell Design ◽  
Idaho National Laboratory ◽  
The University ◽  
Solid Oxide Cell

The Idaho National Laboratory has been researching the application of solid-oxide fuel cell technology for large-scale hydrogen production. As a result, the Idaho National Laboratory has been testing various cell designs to characterize electrolytic performance. NASA, in conjunction with the University of Toledo, has developed a new cell concept with the goals of reduced weight and high power density. This paper presents results of the INL’s testing of this new solid oxide cell design as an electrolyzer. Gas composition, operating voltage, and other parameters were varied during testing. Results to date show the NASA cell to be a promising design for both high power-to-weight fuel cell and electrolyzer applications.

Sign in / Sign up

Export Citation Format

Share Document