SPIRE Program Kickoff - Energy.gov · 2009-10-14 · SPIRE Program Kickoff Topic 3A. Cell...
Transcript of SPIRE Program Kickoff - Energy.gov · 2009-10-14 · SPIRE Program Kickoff Topic 3A. Cell...
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SPIRE Program KickoffTopic 3A. Cell Degradation Studies / Degradation Studies
Durability of Low Pt Fuel Cells Operating at High Power Density
US DOE Fuel Cell Projects Kickoff MeetingDOE Award: DE-EE0000469 October 1st, 2009
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Program Objectives
The objective of this program is to study and identify strategies to assure durability of fuel cells designed to meet DOE cost targets.
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Technical Barriers
Barrier Approach Strategy
A. Durability
Reinforced, Stabilized Membrane MEA Partner
Durability-Enhanced Electrodes Electrocatalyst/MEA Partner
Optimized Operating ConditionsParametric model & experimental studies
B. Cost
Low Pt Loadings (0.2 mg/cm2) Electrocatalyst/MEA Partner
High Power Density (>1.0W/cm2) Open Flowfield Stack
Metallic Stack Architecture Incumbent Derivative
Premise: Exceeding the MEA power density target (>1 W/cm2) while maintaining low total Pt loading (≤0.2 mg/cm2) will enable cost targets to be met
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Technical ObjectiveGoal: Define the rating current density (RCD) of an advanced stack technology consistent
with DOE cost targets, and elucidate critical durability mechanisms at this RCD.
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Modeling Concept
Requires: Spatially and temporally resolved performance model (mechanistic)Accumulative material property degradation model (empirical)Design/initial condition flexibility for BOL properties and time-varying conditions
The key deliverable of this program is a durability model experimentally validated over a range of stack technologies operating at high power.
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Degradation Modes
What modes are most important at high current density?
What are the appropriate empirical relationships and upon which variables do they depend?
Cat
ho
de
Flo
w-F
ield
Sep
arat
or
Pla
te
Co
oli
ng
Flo
w-F
ield
GD
L
MEA
Through-Plane Thermal Gradient
Tc(1A/cm2)
Tc(3A/cm2)
TcoolingLocal Humidity?
Local Aging?
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Parameter SpaceApproach: Single cells will be run on a combination of AST and NST (“new stress test”)
protocols to calibrate the model over a wide range of material configurations.
Experimental Design Space
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Schedule
Project Year 1 Project Year 2 Project Year 3
TASK 1: High Power Operation Analysis [Nuvera]
TASK 2: Single-Cell HardwarePreparation [Nuvera]
TASK 4: Single-Cell Testing[LANL]
TASK 6: Stack-Level Testing[Nuvera]
TASK 5: Failure & Post-TestCharacterization [LANL/ORNL]
TASK 7: Durability Model Development [ANL]
TASK 8: Program Management[Nuvera]
TASK 3: Materials Preparation [Gore]
Model blockdiagram published
Demonstrate data variability between Nuvera and Los Alamos National Lab is within 3-sigma bounds of the variation established during the USFCC round-robin AST testing. [End of Q8]
A
2009 2010 2011 2012Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12
Oc
t 1
st , 2
00
9
Rev. 8/26/2009
A
1
SCNOF test hardware validated for reliable performance and
delivered to partners
2
Comparative data for SCLC & SCNOF on AST protocols
published
3
Model correlations to full-area test results published
4
Validated model & data set published and available to industry
5
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SPIRE Budget
$/000
Federal
Funding
Cost
Share
Total
Value
FY09 297 94 391
FY10 1,192 374 1,566
FY11 1,467 458 1,925
FY12 919 295 1,214
Total 3,875 76% 1,221 24% 5,096
Funding by Fiscal Year
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Summation
Increasing rated power density is an effective and largely unexplored way to reduce the cost of fuel cell systems in both the near- and long-term.
Limited operating experience leaves open questions regarding alternate or accelerated degradation mechanisms at high (>1.0W/cm2) power density.
This project will reveal those new factors that would challenge durable operation under these cost-effective conditions and help clarify what developments are needed for success.
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F U E L C E L L S
EXPERIENCE
The Future of Energy®