Ultralow Degradation Rates in HT-PEM Fuel Cells

Rastedt, Maren; Pinar, F. Javier; Wagner, Peter; García, Héctor R.; Steenberg, Thomas; Hjuler, Hans Aage; Paidar, Martin; Bouzek, Karel

doi:10.1149/07514.0301ecst

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…The degradation rate of MEA B revealed a value of -6 µV/h and corresponds to both the performance and the voltage gap compared with the other three MEAs. This load cycling degradation rate is in the same range like the best published degradation rates for long term tests under constant load (1,3,4). MEA C shows the lowest performance and the highest degradation rate (-96 µV/h, see Table II) compared to the other MEAs shown in Figure 1, while the initial voltage is close to the starting value of MEA A.…”

Section: Resultssupporting

confidence: 74%

“…Such features could be lifetime, performance and stability of the inserted materials. Typical scientific investigations representing also these quality issues are long term operation at constant load conditions (1)(2)(3)(4), start/stop-cycling (5)(6) and load cycling procedures (7). This paper focusses on accelerated stress tests to investigate PBI-based HT-PEM membrane electrode assemblies (MEA) from four different providers in order to provide a good overview on currently available MEAs.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of HT-PEM Fuel Cells via Load Cycling at High Current Densities

Rastedt¹,

Tullius²,

Büsselmann³

et al. 2017

ECS Trans.

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The basic prerequisites for a well-functioning fuel cell stack are identical MEAs with similar performances and power outputs. One poor MEA in a cell stack can negatively affect the overall performance as well as the lifetime of this fuel cell stack. During this work, HT-PEM-MEAs of four different providers were tested using the accelerated stress test load cycling at high current densities (14 min at 1.0 A/cm² and 6 min at 0.6 A/cm²) and compared with each other. In addition, internal-batch comparisons for two of the four suppliers were carried out. There are distinctive differences between suppliers as well as within a batch, clearly showing the need for the development of uniform quality assurance measures. In-situ electrochemical as well as ex-situ micro-computed tomography results will be presented for this MEA evaluation.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Evaluation of HT-PEM Fuel Cells via Load Cycling at High Current Densities

Rastedt¹,

Tullius²,

Büsselmann³

et al. 2017

ECS Trans.

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show abstract

“…The authors of this publication made similar observations with this type of MEA. A stable long term test showed degradation rates below 3 µV h −1 for 15,500 h. After this period, the MEA exhibited a large voltage drop and reached end of test (EoT) after 16,080 h; parts of this experiment have been published in .…”

Section: Introductionmentioning

confidence: 99%

Rapid and Flash Tests: Indicator for Quality of HT‐PEM Fuel Cells Batches?

Rastedt¹,

Büsselmann²,

Tullius³

et al. 2018

Fuel Cells

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In order to control the batch quality of membrane electrode assemblies (MEA), two new short tests have been developed. The first being a rapid test, composed of a start‐up and break‐in followed by initial characterization and has a test duration of about 65 h, while the second is a flash test, which is reduced by the break‐in, so that the maximum duration is 8 h. These tests have been compared with classical accelerated stress tests like load cycling at high current densities and start/stop‐cycling. For the investigations presented in this publication, high temperature polymer electrolyte MEAs from two different suppliers were used. The extensive electrochemical characterization clearly shows that the newly introduced fast tests can be used to check the batch qualities. In addition to the electrochemical investigations, the phosphoric acid content of all MEAs has been determined and ex situ micro‐computed tomography analysis has been performed.

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“…In the past, it was used to analyse MEAs as well as bipolar plates in detail. These studies showed power losses due to MEA degradation in the form of membrane thinning or formation of pinholes, catalyst layer thinning and formation of cracks or even intrusion of GDL fibres (14)(15)(16). Carbon-based composite bipolar plates are prone to undergo corrosion and thus fail to ensure a proper functionality during critical conditions (17,18).…”

Section: Introductionmentioning

confidence: 99%

Understanding Degradation Phenomena in HT-PEM Fuel Cells Using Micro-Computed Tomography

Schmies¹,

Schonvogel²,

Büsselmann³

et al. 2020

ECS Trans.

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An extended and reliable lifetime of high temperature proton exchange membrane fuel cells is inevitable for the commercialization of this technology in the near future. Therefore, components of the high temperature-proton exchange membrane fuel cell (HT-PEMFC), such as the bipolar plates (BPPs) and the membrane electrode assembly (MEA), are investigated regarding degradation phenomena during constant cell operation with use of contaminated air in the cathode feed. µ-computed tomography (µ-CT) is applied to visualize morphological changes due to this operation and to analyse each component individually on the micro meter scale. The thickness of each MEA layer is determined and correlated to results from electrochemical measurements. Furthermore the open porosity of the bipolar plates is determined and compared to phosphoric acid retention of the cell.

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Ultralow Degradation Rates in HT-PEM Fuel Cells

Cited by 12 publications

References 8 publications

Evaluation of HT-PEM Fuel Cells via Load Cycling at High Current Densities

Evaluation of HT-PEM Fuel Cells via Load Cycling at High Current Densities

Rapid and Flash Tests: Indicator for Quality of HT‐PEM Fuel Cells Batches?

Understanding Degradation Phenomena in HT-PEM Fuel Cells Using Micro-Computed Tomography

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