scholarly journals Hydrogen Production Performance of a 10-Cell Planar Solid-Oxide Electrolysis Stack

2005 ◽  
Vol 3 (2) ◽  
pp. 213-219 ◽  
Author(s):  
J. E. O’Brien ◽  
C. M. Stoots ◽  
J. S. Herring ◽  
J. Hartvigsen
Keyword(s):  
Hydrogen Production ◽  
Gas Flow ◽  
Solid Oxide ◽  
Production Performance ◽  
Electrolysis Cells ◽  
Consumption Rates ◽  
Cell Current ◽  
Current Densities ◽  
Metallic Interconnect ◽  
Electrolysis Mode

An experimental study is under way to assess the performance of solid-oxide cells operating in the steam electrolysis mode for hydrogen production over a temperature range of 800-900°C. Results presented in this paper were obtained from a ten-cell planar electrolysis stack, with an active area of 64cm2 per cell. The electrolysis cells are electrolyte supported, with scandia-stabilized zirconia electrolytes (∼140μm thick), nickel-cermet steam/hydrogen electrodes, and manganite air-side electrodes. The metallic interconnect plates are fabricated from ferritic stainless steel. The experiments were performed over a range of steam inlet mole fractions (0.1–0.6), gas flow rates (1000-4000sccm), and current densities (0-0.38A∕cm2). Steam consumption rates associated with electrolysis were measured directly using inlet and outlet dewpoint instrumentation. Cell operating potentials and cell current were varied using a programmable power supply. Hydrogen production rates up to 100Nl∕h were demonstrated. Values of area-specific resistance and stack internal temperatures are presented as a function of current density. Stack performance is shown to be dependent on inlet steam flow rate.

scholarly journals Hydrogen Production Performance of a 10-Cell Planar Solid-Oxide Electrolysis Stack

2005 ◽  
Author(s):  
J. E. O’Brien ◽  
C. M. Stoots ◽  
J. S. Herring ◽  
J. Hartvigsen
Keyword(s):  
Hydrogen Production ◽  
Gas Flow ◽  
Solid Oxide ◽  
Production Performance ◽  
Electrolysis Cells ◽  
Consumption Rates ◽  
Cell Current ◽  
Current Densities ◽  
Metallic Interconnect ◽  
Electrolysis Mode

An experimental study is under way to assess the performance of solid-oxide cells operating in the steam electrolysis mode for hydrogen production over a temperature range of 800 to 900°C. Results presented in this paper were obtained from a ten-cell planar electrolysis stack, with an active area of 64 cm2 per cell. The electrolysis cells are electrolyte-supported, with scandia-stabilized zirconia electrolytes (∼140 μm thick), nickel-cermet steam/hydrogen electrodes, and manganite air-side electrodes. The metallic interconnect plates are fabricated from ferritic stainless steel. The experiments were performed over a range of steam inlet mole fractions (0.1–0.6), gas flow rates (1000–4000 sccm), and current densities (0 to 0.38 A/cm2). Steam consumption rates associated with electrolysis were measured directly using inlet and outlet dewpoint instrumentation. Cell operating potentials and cell current were varied using a programmable power supply. Hydrogen production rates up to 100 Normal liters per hour were demonstrated. Values of area-specific resistance and stack internal temperatures are presented as a function of current density. Stack performance is shown to be dependent on inlet steam flow rate.

Performance Characterization of Solid-Oxide Electrolysis Cells for Hydrogen Production

2004 ◽  
Author(s):  
J. E. O’Brien ◽  
C. M. Stoots ◽  
J. S. Herring ◽  
P. A. Lessing
Keyword(s):  
Fuel Cell ◽  
Hydrogen Production ◽  
Gas Flow ◽  
Solid Oxide ◽  
Cell Performance ◽  
Production Performance ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells

An experimental study has been completed to assess the hydrogen-production performance of single solid-oxide electrolysis cells operating over a temperature range of 800 to 900°C. The experiments were performed over a range of steam inlet partial pressures (2.3 – 12.2 kPa), carrier gas flow rates (50–200 sccm), and current densities (−0.75 to 0.25 A/cm2) using single electrolyte-supported button cells of scandia-stabilized zirconia. Steam consumption rates associated with electrolysis were measured directly using inlet and outlet dewpoint instrumentation. Cell operating potentials and cell current were varied using a programmable power supply. Values of area-specific resistance and hydrogen production rate are presented as a function of current density. Cell performance is shown to be continuous from the fuel-cell mode to the electrolysis mode of operation. The effects of steam starvation and thermal cycling on cell performance parameters are discussed. Laboratory capabilities are currently being expanded to allow for testing and characterization of multiple-cell electrolysis stacks. Some fundamental differences between the fuel-cell and electrolysis modes of operation have been summarized.

Performance Measurements of Solid-Oxide Electrolysis Cells for Hydrogen Production

2005 ◽  
Vol 2 (3) ◽  
pp. 156-163 ◽  
Author(s):  
J. E. O’Brien ◽  
C. M. Stoots ◽  
J. S. Herring ◽  
P. A. Lessing ◽  
J. J. Hartvigsen ◽  
...  
Keyword(s):  
Gas Flow ◽  
Solid Oxide ◽  
Cell Performance ◽  
Dew Point ◽  
Performance Measurements ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Consumption Rates ◽  
Cell Current ◽  
Solid Oxide Electrolysis Cells

An experimental study has been completed to assess the performance of single solid-oxide electrolysis cells operating over a temperature range of 800 to 900°C. The experiments were performed over a range of steam inlet partial pressures (2.3–12.2 kPa), carrier gas flow rates (50–200 sccm), and current densities (−0.75–0.25A∕cm2) using single electrolyte-supported button cells of scandia-stabilized zirconia. Steam consumption rates associated with electrolysis were measured directly using inlet and outlet dew-point instrumentation. Cell operating potentials and cell current were varied using a programmable power supply and monitored continuously. Values of area-specific resistance and thermal efficiency are presented as a function of current density. Cell performance is shown to be continuous from the fuel-cell mode to the electrolysis mode of operation. The effects of steam starvation and thermal cycling on cell performance parameters are discussed.

scholarly journals Performance of Single Electrode-Supported Cells Operating in the Electrolysis Mode

2009 ◽  
Author(s):  
J. E. O’Brien ◽  
G. K. Housley ◽  
D. G. Milobar ◽  
Nathalie Petigny
Keyword(s):  
Hydrogen Production ◽  
Gas Flow ◽  
Single Cells ◽  
Cell Performance ◽  
Steam Consumption ◽  
Electrolysis Cells ◽  
Consumption Rates ◽  
Cell Test ◽  
Current Characteristics ◽  
Electrolysis Mode

An experimental study is under way to assess the performance of electrode-supported solid-oxide cells operating in the steam electrolysis mode for hydrogen production over a temperature range of 800 to 900°C. Results presented in this paper were obtained from single cells, with an active area of 16 cm2 per cell. The electrolysis cells are electrode-supported, with yttria-stabilized zirconia (YSZ) electrolytes (∼10 μm thick), nickel-YSZ steam/hydrogen electrodes (∼1400 μm thick), and manganite (LSM) air-side electrodes. The experiments were performed over a range of steam inlet mole fractions (0.1–0.6), gas flow rates, and current densities (0 to 0.6 A/cm2). Steam consumption rates associated with electrolysis were measured directly using inlet and outlet dewpoint instrumentation. On a molar basis, the steam consumption rate is equal to the hydrogen production rate. Cell performance was evaluated by performing DC potential sweeps at 800, 850, and 900°C. The voltage-current characteristics are presented, along with values of area-specific resistance as a function of current density. Long-term cell performance is also assessed to evaluate cell degradation. Details of the custom single-cell test apparatus developed for these experiments are also presented.

Performance Measurements of Solid-Oxide Electrolysis Cells for Hydrogen Production From Nuclear Energy

2004 ◽  
Author(s):  
J. E. O’Brien ◽  
C. M. Stoots ◽  
J. S. Herring ◽  
P. A. Lessing ◽  
J. J. Hartvigsen ◽  
...  
Keyword(s):  
Gas Flow ◽  
Solid Oxide ◽  
Cell Performance ◽  
Performance Measurements ◽  
Partial Pressures ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Consumption Rates ◽  
Cell Current ◽  
Solid Oxide Electrolysis Cells

An experimental study has been completed to assess the performance of single solid-oxide electrolysis cells operating over a temperature range of 800 to 900°C. The experiments were performed over a range of steam inlet partial pressures (2.3–12.2 kPa), carrier gas flow rates (50–200 sccm), and current densities (−0.75 to 0.25 A/cm2) using single electrolyte-supported button cells of scandia-stabilized zirconia. Steam consumption rates associated with electrolysis were measured directly using inlet and outlet dewpoint instrumentation. Cell operating potentials and cell current were varied using a programmable power supply and monitored continuously. Values of area-specific resistance and thermal efficiency are presented as a function of current density. Cell performance is shown to be continuous from the fuel-cell mode to the electrolysis mode of operation. The effects of steam starvation and thermal cycling on cell performance parameters are discussed.

scholarly journals Boosting the performance and durability of Ni/YSZ cathode for hydrogen production at high current densities via decoration with nano-sized electrocatalysts

Nanoscale ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 4394-4406 ◽  
Author(s):  
Simona Ovtar ◽  
Xiaofeng Tong ◽  
Janet J. Bentzen ◽  
Karl T. S. Thydén ◽  
Søren Bredmose Simonsen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
State Of The Art ◽  
Simple Procedure ◽  
The State ◽  
Solid Oxide ◽  
High Current ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Current Densities ◽  
Solid Oxide Electrolysis Cells

A relatively simple procedure of infiltrating nano-sized Ce0.8Gd0.2O2−δ electrocatalysts into the state-of-the-art Ni/YSZ cathode greatly enhanced the performance and durability of solid oxide electrolysis cells.

Electrochemical Performance of Ni-YSZ, Ni/Ru-GDC, LSM-YSZ, LSCF and LSF Electrodes for Solid Oxide Electrolysis Cells

2010 ◽  
Author(s):  
P. Kim-Lohsoontorn ◽  
H.-B. Yim ◽  
J.-M. Bae
Keyword(s):  
Electrochemical Performance ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Hydrogen Electrode ◽  
Anodic Reaction ◽  
Oxygen Electrodes ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells ◽  
Electrolysis Mode

The electrochemical performance of solid oxide electrolysis cells (SOECs) having nickel – yttria stabilized zirconia (Ni-YSZ) hydrogen electrode and a composite lanthanum strontium manganite – YSZ (La0.8Sr0.2MnO3−δ – YSZ) oxygen electrodes has been studied over a range of operating conditions temperature (700 to 900°C). Increasing temperature significantly increased electrochemical performance and hydrogen generation efficiency. Durability studies of the cell in electrolysis mode were made over 200 h periods (0.1 A/cm2, 800°C, and H2O/H2 = 70/30). The cell significantly degraded over the time (2.5 mV/h). Overpotentials of various SOEC electrodes were evaluated. Ni-YSZ as a hydrogen electrode exhibited higher activity in SOFC mode than SOEC mode while Ni/Ru-GDC presented symmetrical behavior between fuel cell and electrolysis mode and gave lower losses when compared to the Ni-YSZ electrode. All the oxygen electrodes gave higher activity for the cathodic reaction than the anodic reaction. Among the oxygen electrodes in this study, LSM-YSZ exhibited nearest to symmetrical behavior between cathodic and anodic reaction. Durability studies of the electrodes in electrolysis mode were made over 20–70 h periods. Performance degradations of the oxygen electrodes were observed (3.4, 12.6 and 17.6 mV/h for LSM-YSZ, LSCF and LSF, respectively). The Ni-YSZ hydrogen electrode exhibited rather stable performance while the performance of Ni/Ru-GDC decreased (3.4 mV/h) over the time. This was likely a result of the reduction of ceria component at high operating voltage.

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