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

J. E. O’Brien; C. M. Stoots; J. S. Herring; J. Hartvigsen

doi:10.1115/1.2179435

Journal of Fuel Cell Science and Technology | Volume 3 | Issue 2 | Research Paper

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RESEARCH PAPERS

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

J. E. O’Brien, C. M. Stoots, J. S. Herring and J. Hartvigsen

[+] Author and Article Information

J. E. O’Brien

Idaho National Laboratory Idaho Falls, ID 83415jzo@inel.gov

C. M. Stoots, J. S. Herring

Idaho National Laboratory Idaho Falls, ID 83415

J. Hartvigsen

Ceramatec, Inc. 2425 S 900 W, Salt Lake City, UT 84037

J. Fuel Cell Sci. Technol 3(2), 213-219 (Oct 19, 2005) (7 pages) doi:10.1115/1.2179435 History: Received July 19, 2005; Revised October 19, 2005

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Abstract

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 $64 {cm}^{2}$ per cell. The electrolysis cells are electrolyte supported, with scandia-stabilized zirconia electrolytes ( $\sim 140 μ m$ 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 $(0 - 0.38 A ∕ {cm}^{2})$ . 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 $100 Nl ∕ h$ 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.

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Figure 2

High-temperature electrolysis hardware

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Figure 3

Ten-cell electrolysis stack

Interconnect plate and single electrolysis cell

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Figure 4

Interconnect plate and single electrolysis cell

Ten-cell stack mounted on fixture for testing at INL

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Figure 5

Ten-cell stack mounted on fixture for testing at INL

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Figure 6

Stack open-cell potential during heatup

Stack operating potential as a function of current density

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Figure 7

Stack operating potential as a function of current density

Per-cell area-specific resistance measured during DC potential sweeps

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Figure 8

Per-cell area-specific resistance measured during DC potential sweeps

Hydrogen production rates during DC potential sweep

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Figure 9

Hydrogen production rates during DC potential sweep

Electrolysis efficiencies as a function of operating voltage

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Figure 10

Electrolysis efficiencies as a function of operating voltage

Stack temperatures measured during DC potential sweep

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Figure 11

Stack temperatures measured during DC potential sweep

Schematic of experimental apparatus for electrolysis stack testing

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Figure 1

Schematic of experimental apparatus for electrolysis stack testing

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O’Brien JE, Stoots CM, Herring JS, Hartvigsen JJ. Hydrogen Production Performance of a 10-Cell Planar Solid-Oxide Electrolysis Stack. ASME. J. Fuel Cell Sci. Technol. 2005;3(2):213-219. doi:10.1115/1.2179435.

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

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