Reference materials in adequate quantity (Part of D 4.1) · Anode GDL Sigracet 35DC Annex 4 The DC...
Transcript of Reference materials in adequate quantity (Part of D 4.1) · Anode GDL Sigracet 35DC Annex 4 The DC...
01 February 2011, vers. 1.00 1 of 12
FCH JU Grant Agreement no.: 245113
Project acronym: KEEPEMALIVE
Project title: Knowledge to Enhance the Endurance of PEM fuel cells
by Accelerated Lifetime Verification Experiments
Funding scheme: Collaborative Project
Area: SP1-JTI-FCH.3 Stationary Power Generation & CHP
Start date of project: 01.01.2010
Duration:
Project Coordinator:
36 months
Energy research Centre of the Netherlands ECN (NL)
Report on
Reference materials in adequate quantity
(Part of D 4.1)
Author (partner): Laila Grahl-Madsen (IRD)
Other authors: Tomas Klicpera (Fuma-Tech)
Workpackage: WP4, Preparation and improvement of MEAs and components
Workpackage leader
(partner):
Tomas Klicpera (Fuma-Tech)
Date released by WP leader:
Date released by Coordinator:
04.02.2011
04.02.2011
Dissemination level
PU Public
PP Restricted to other programme participants (including the Commission Services)
RE Restricted to a group specified by the consortium (including the Commission Services)
CO Confidential, only for members of the consortium (including the Commission Services) X
Revisions Version: Date: Changed by: Comments:
1.00 04 Feb. 2011 Laila Grahl-Madsen First draft
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TABLE OF CONTENT
TABLE OF CONTENT
MEA Precursors ......................................................................................................................... 3
Benchmark MEAs .................................................................................................................. 3
MEAs based on improved Precursors .................................................................................... 4
Annex 1: Benchmark Cathode catalyst Specification ................................................................ 5
Annex 2: Benchmark Anode catalyst Specification .................................................................. 6
Annex 3: Benchmark catalyst Support Specification ................................................................ 7
Annex 4: Benchmark GDL Specification .................................................................................. 9
Annex 5: Benchmark Membrane Specification ....................................................................... 11
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MEA PRECURSORS
BENCHMARK MEAS
This document summarises the precursor materials used in the preparation of the first 104 5-layer
benchmark MEA1s (Table 1) prepared and tested within the KeePEMAlive project. The electrodes
of these MEAs are prepared by IRD using an ultrasonic spray-coating technique either directly onto
the membrane2 as in the MEA batch from Jun/Jul-10 (Table 1) or onto the GDL
3 as for the provided
MEAs in Nov-10. The MEA precursors used for the benchmark MEAs are listed in Table 2.
The first batch of benchmark MEAs show an initial acceptable performance, but an un-acceptable
durability as membrane failure was developed rather quickly. The reason was partly due to the
applied lamination procedure, which was optimised for Nafion and not FumaPEM membranes.
Much better durability was obtained by all Partners in the second MEA batch provided.
Table 1 Summary of manufactured benchmark MEAs 2010.
Partner
Active Electrode
dimension
[cm x cm]
Membrane Dimension
[cm x cm]
Qty of
MEAs
Jun/Jul-10
Qty of
MEAs
Nov-10
Total Qty
of MEAs
2010
IRD 1.7 x 1.7 2.5 x 2.5 0 0 0
2.55 x 2.55 3.5 x 3.5 8 8 16
ECN ø = 3.1 7.0 x 7.0 3 8 11
7.1 x 7.1 12.7 x 12.7 2 6 8
Fumatech 5.0 x 5.0 7.0 x 7.0 2 0 2
7.1 x 7.1 10.0 x 10.0 0 0 0
SINTEF 5.0 x 5.0 8.0 x 8.0 2 3 5
2.3 x 2.3 4.3 x 4.3 5 5
Graz 12.0 x 2.2 13.5 x 3.5 3 8 11
Eifer 5.0 x 5.0 7.0 x 7.0 2 10 12
JRC 5.0 x 5.0 7.5 x 7.5 0 3 3
2.3 x 2.3 5.0 x 5.0 0 3 3
CNRS 1.7 x 1.7 3.7 x 3.7 10 10
2.55 x 2.55 4.6 x 4.6 8 10 18
Total number of MEAs 30 74 104
Total electrode area (cm2) 456 1,618 2,074
Total membrane area (cm2) 1,203 4,428 5,631
1 MEA: Membrane Electrode Assembly
2 CCM: Catalyst Coated Membrane
3 GDL: Gas Diffusion Layer
CCB: Catalyst Coated Backing equivalent to GDE: Gas Diffusion Electrodes
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Table 2 The MEA precursors and catalyst loadings for the 5-layer benchmark MEAs.
Description Product ID Catalyst loading Data sheet Comments
Anode GDL Sigracet 35DC Annex 4 The DC grade refers to a
PTFE4 content of 20%
Anode Catalyst 62RKR4 0.3 mg PtRu/cm2 Annex 2 & 3
Membrane Fumapem F-940 Annex 5
Cathode Catalyst 65KR2 0.5 mg Pt/cm2 Annex 1 & 3
Cathode GDL Sigracet 35DC Annex 4 Do Anode GDL
MEAS BASED ON IMPROVED PRECURSORS
Experimental MEAs based on a reinforced FumaPEM membrane (Annex 6) has been tested with
promising results for almost 400 hours by IRD (Fig. 1). The results are so encouraging that the
following MEA batches will be based on this membrane.
0
250
500
750
1,000
0 100 200 300 400
Hours @ c.0.35 A/cm2
Ave
rage
ce
ll vo
ltag
e [
mV
]
IRD Pem MEA 6.00 based on Nafion 212 membrane (n=10); DV = -55 µV/h
W44A based on reinforced FumaPEM membrane/CCB (n=2); DV = -30 µV/h
Fig. 1
Longer-time performance
of the new KeePEMAlive
MEA equipped with
reinforced FumaPEM
membrane compared to
the IRD state-of-the-art
MEA based on Nafion
membrane.
4 PTFE: PolyTetraFluoroEthylene also known as Teflon
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ANNEX 1: BENCHMARK CATHODE CATALYST SPECIFICATION
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ANNEX 2: BENCHMARK ANODE CATALYST SPECIFICATION
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ANNEX 3: BENCHMARK CATALYST SUPPORT SPECIFICATION
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ANNEX 4: BENCHMARK GDL SPECIFICATION
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ANNEX 5: BENCHMARK MEMBRANE SPECIFICATION
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