scholarly journals Solid Oxide Steam Electrolyzer: Gas Diffusion Steers the Design of Electrodes

2020 ◽  
Author(s):  
Jonathan Deseure ◽  
Jérôme Aicart
Keyword(s):  
Renewable Energy Sources ◽  
Current Source ◽  
Current Collector ◽  
Gas Diffusion ◽  
Solid Oxide ◽  
Source Distribution ◽  
Oxide Electrodes ◽  
Ohmic Losses ◽  
Current Voltage ◽  
Current Voltage Characteristics

The hydrogen production by SOECs coupled with renewable energy sources is a promising route for the sustainability hydrogen economy. Multiphysics computing simulations appear to be the most efficient approaches to analyze the coupled mechanisms of SOEC operation. Using a relevant model, it is possible to predict the electrical behavior of solid oxide electrodes considering the current collector design. The influences of diffusion and grain diameter on cell performances can be investigated through 2D simulations, current–voltage characteristics, and current source distribution through electrodes. The simulation results emphasize that diffusion is linked to a relocation of the reaction away from the interface electrolyte/electrode, in the volume of the cathode. Furthermore, the current collector proves itself to be a great obstacle to gas access, inducing underneath it a shortage of steam. Inducing gradients of grain diameters in both anode and cathode drives the current sources to occur close to the electrode/electrolyte interface, thus decreasing ohmic losses and facilitating gas access. This approach shows the crucial importance of cathode microstructure as this electrode controls the cell response.

scholarly journals Water electrolyzer for renewable energy systems

2021 ◽  
Vol 289 ◽  
pp. 05004
Author(s):  
V. N Kuleshov ◽  
N. V Kuleshov ◽  
S. V Kurochkin ◽  
A. A. Fedotov ◽  
E. E. Sleptsova ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electrolytic Cell ◽  
Zirconium Hydroxide ◽  
Hydrogen Energy ◽  
Current Voltage ◽  
Containment Shell ◽  
Current Voltage Characteristics ◽  
A New Technique

The article is devoted to the features of the alkaline water electrolyzers use in power plants with a hydrogen energy storage systems based on renewable energy sources. The technology of nickel–cobalt electrodes electrochemical formation according to a printed 2–dimensional sketch is proposed. A new technique for the synthesis of diaphragms with a zirconium hydroxide hydrogel as a hydrophilic filler is considered. The current–voltage characteristics of an electrolytic cell located inside outer containment shell, designed for pressures up to 160 atm, are investigated.

Deposition of a Thin-Film CGO Electrolyte for Solid Oxide Fuel Cells

2016 ◽  
Vol 685 ◽  
pp. 776-780
Author(s):  
Andrey A. Solovyev ◽  
Anastasya N. Kovalchuk ◽  
Igor V. Ionov ◽  
S.V. Rabotkin ◽  
Anna V. Shipilova ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Magnetron Sputtering ◽  
Solid Oxide Fuel Cells ◽  
Operating Temperature ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Ysz Electrolyte

Reducing the operating temperature of solid oxide fuel cells (SOFCs) from 800-1000°C is one of the main SOFC research goals. It can be achieved by lowering the thickness of an electrolyte (ZrO2:Y2O3 (YSZ) is widely used as electrolyte material). On the other hand the problem can be solved by using of another electrolyte material with high ionic conductivity at intermediate temperatures. Therefore the present study deals with magnetron sputtering of ceria gadolinium oxide (CGO), which has a higher conductivity compared to YSZ. The microstructure of CGO layers deposited on porous NiO/YSZ substrates by reactive magnetron sputtering of Ce:Gd cathode is investigated. Current voltage characteristics (CVC) of a fuel cell with NiO/YSZ anode, CGO electrolyte and LSCF/CGO cathode were obtained. It was shown that the power density of a fuel cell with CGO electrolyte weakly depends on the operating temperature in the range of 650-750°C in contradistinction to YSZ electrolyte, and is about 600-650 mW/cm2.

Current-voltage characteristics of thin Ge2Sb2Te5 films taken using a measuring circuit with a current source

2014 ◽  
Vol 59 (4) ◽  
pp. 546-550 ◽  
Author(s):  
S. A. Fefelov ◽  
L. P. Kazakova ◽  
S. A. Kozyukhin ◽  
K. D. Tsendin ◽  
D. Arsova ◽  
...  
Keyword(s):  
Current Source ◽  
Measuring Circuit ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
A Current

An Effect of Anodic Reaction on the Current-Voltage Characteristics of Solid Oxide Fuel Cells

1995 ◽  
Vol 24 (10) ◽  
pp. 963-964 ◽  
Author(s):  
Koichi Eguchi ◽  
Yasuhiro Kunisa ◽  
Kentaro Adachi ◽  
Masashi Kayano ◽  
Koshi Sekizawa ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Anodic Reaction ◽  
Current Voltage ◽  
Current Voltage Characteristics

scholarly journals Theory of the current-voltage characteristics of SNS junctions and other superconducting weak links

1970 ◽  
Vol 268 (1188) ◽  
pp. 265-287 ◽  
Keyword(s):  
Phase Locking ◽  
Current Source ◽  
Voltage Source ◽  
Weak Links ◽  
Detailed Calculation ◽  
Flux Flow ◽  
Step Structure ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Density Equation

A theory of the current-voltage characteristics of superconducting-normal-superconducting junctions is proposed. The theory is based on a simple model current-density equation. The form of the currentvoltage characteristic is found to depend critically on whether the electrical source should be treated as a current source or a voltage source at high frequencies. A picture is given of the dynamical state of a junction at finite voltage, and all the important differences between the characteristics observed for SNS junctions and tunnel junctions are explained at least qualitatively. In particular, the theory covers the cases of a junction wide enough to be limited by its own field and the step structure known to be induced by an applied h.f. field. For wide junctions the predicted behaviour is an exactly calculable quantized flux flow in one dimension. It is the phase-locking of this flux flow by the applied h.f. field which leads to the step structure. A detailed calculation of the rounding of the steps by noise is given; the steps are predicted to be exceedingly steep. The theory is compared with the theories of other superconducting weak links.

Current-Voltage Characteristics and Impedance Analysis of Solid Oxide Fuel Cells for Mixed H[sub 2] and CO Gases

2002 ◽  
Vol 149 (3) ◽  
pp. A227 ◽  
Author(s):  
K. Sasaki ◽  
Y. Hori ◽  
R. Kikuchi ◽  
K. Eguchi ◽  
A. Ueno ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Impedance Analysis ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Current Voltage ◽  
Current Voltage Characteristics

PULSED CURRENT VOLTAGE CHARACTERISTICS OF A THERMALLY PRODUCED PLASMA

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-491-C7-492
Author(s):  
N. St. J. Braithwaite ◽  
J. E. Allen
Keyword(s):  
Pulsed Current ◽  
Current Voltage ◽  
Current Voltage Characteristics

Current-voltage characteristics of Li-doped MgO oxidized at elevated temperatures

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-398-C6-400 ◽  
Author(s):  
Y. Chen ◽  
J. L. Boldu ◽  
V. M. Orera
Keyword(s):  
Elevated Temperatures ◽  
Current Voltage ◽  
Current Voltage Characteristics
Sign in / Sign up

Export Citation Format

Share Document