RECENT ADVANCES IN HIGH TEMPERATURE ELECTROLYSIS AT IDAHO NATIONAL LABORATORY: STACK TESTS Page: 4 of 10
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Figure 3. Exploded view of St. Gobain 3-cell stack.
machined into both surfaces of each interconnect, providing
gas separation, current collection, and flow distribution.
Contact aid was used to enhance electric conduction. Sealing
was provided by a means of complaint seal developed by
The St. Gobain cell and stack configuration was
developed specifically for the long-term operation in the fuel
cell mode. The design was developed at the Julich Institute for
Energy Research and licensed by St. Gobain. This stack
geometry is designated the F design. The short stack includes
three electrode-supported cells with metallic frames and
interconnect plates fabricated from ferritic stainless steel
(Crofer22APU). An exploded view of the stack is shown in
Figure 3. The stack is internally manifolded with a counter
flow gas flow configuration. Each frame piece encloses a cell
with a nickel mesh in contact with the steam-hydrogen
electrode. The interconnects include grooves for air flow
distribution. Each cell is 10 x 10 cm in dimension with an
active area of 81 cm2. The steam-hydrogen electrode material
is Ni/YSZ cermet. The air electrode is LSM with a chromium
evaporation protective layer and a contact (or bond) layer to
minimize contact resistance with the interconnect. The air
electrode includes both a functional layer of LSM and 8YSZ
plus a cathode layer of pure LSM. The stack is sealed with a
glass seal. The top and bottom metallic end plates include tabs
for power connections.
heat trace# 1
ST STAND #6 To Roof To Roof
Vent Cooling Vent
- T Manual I T Manual
heat trace# 2 sdheattrace # 3
P H- H P
L Ts Tsd L Ts sd
T Drain Drain
Figure 4: Piping and instrumentation diagram for the INL High Temperature Steam Electrolysis.
On Valve Rack
Bubbler A CEM
OFF cZS O
Valves A1, A2, A3
Normal B pass Large Small
OFF c2Z3 N
Valves B1, B2 Valves C1, C2, C3
Nitrogen Purge Cooling Water
OFFC3 ON OFF C- ON
Valve D Valve G
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X, Zhang; O'Brien, J. E.; O'Brien, R. C.; Hartvigsen, J. J.; Tao, G. & Petigny, N. RECENT ADVANCES IN HIGH TEMPERATURE ELECTROLYSIS AT IDAHO NATIONAL LABORATORY: STACK TESTS, article, July 1, 2012; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc827566/m1/4/: accessed February 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.