Relationship between carbon corrosion and positive electrode potential in a proton-exchange membrane fuel cell during start/stop operation

Kim, Jutae; Lee, Junhee; Tak, Yongsug

doi:10.1016/j.jpowsour.2009.03.039

Cited by 144 publications

(72 citation statements)

References 9 publications

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“…In addition to measuring or mathematically predicting the high cathode potential experienced during the startup and shutdown processes, researchers have also conducted other related tests, such as measuring the current distribution in segmented cells [60][61][62], monitoring the concentration of CO or CO 2 during startup and shutdown [59,63], evaluating the effect of cell design (flow field structure and GDL thickness) on start-stop phenomena [64,65], and conducting modeling studies [58,[66][67][68][69][70][71][72][73] on water management and carbon-corrosion during startup and shutdown. All the test results have confirmed performance degradation during the startup and shutdown processes of PEMFCs.…”

Section: Reverse Currentmentioning

confidence: 99%

“…Although carbon has most of the above properties, it is susceptible to oxidation or Reprinted from Ref. [59] with permission.…”

Section: Carbon Oxidationmentioning

confidence: 99%

“…It has been reported that although the kinetics of the carbon oxidation reaction is sluggish at low potential and low temperature, the presence of Pt particles will accelerate carbon oxidation [90]. Kim et al [59] directly measured and analyzed exhaust gas using FT-IR during start/stop operation. As shown in Fig.…”

Section: Carbon Oxidationmentioning

confidence: 99%

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A review on performance degradation of proton exchange membrane fuel cells during startup and shutdown processes: Causes, consequences, and mitigation strategies

Wang

et al. 2012

Journal of Power Sources

266

150

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a b s t r a c tPerformance degradation during startup and shutdown is considered an important issue affecting the durability and lifetime of proton exchange membrane fuel cells (PEMFCs). Due to the high potentials experienced by the cathode during startup and shutdown, the conventional carbon support for the cathode catalyst is prone to oxidation by reacting with oxygen or water. This paper presents an overview of the causes and consequences of performance degradation after frequent startup-shutdown cycles. Mitigation strategies are also summarized, including the use of novel catalyst supports and the application of system strategies to prevent performance degradation in PEMFCs. It is found from the literature review that improvements in catalyst supports to prevent oxidation come at the expense of high cost, and the novel supports developed to date are not sufficient to completely prevent carbon oxidation in fuel cell engines. System strategies, including potential control and reaction gas control, have been developed and applied in fuel cell engines to alleviate or even avoid performance decay. This review aims to provide a clear understanding of the mechanisms related to degradation behaviors during the startup and shutdown processes, thereby helping fuel cell material or system developers in their efforts to prevent performance degradation and prolong the lifetime of PEMFCs.Crown

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Section: Reverse Currentmentioning

confidence: 99%

“…Although carbon has most of the above properties, it is susceptible to oxidation or Reprinted from Ref. [59] with permission.…”

Section: Carbon Oxidationmentioning

confidence: 99%

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A review on performance degradation of proton exchange membrane fuel cells during startup and shutdown processes: Causes, consequences, and mitigation strategies

Wang

et al. 2012

Journal of Power Sources

266

150

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“…Kim et al 29 invented a way to connect a reference electrode to a fuel cell membrane (the electrolyte), enabling a potentiostat to measure the potential of a fuel cell cathode during SUSD. The second figure from their study, shows the first potential transient (from a fuel cell shut-down) appears to have the shape of an applied constant current rather than a saw-tooth wave.…”

Section: Methodsmentioning

confidence: 99%

Screening Bifunctional Pt Based NSTF Catalysts for Durability with the Rotating Disk Electrode: The Effect of Ir and Ru

Crowtz

Dahn

2018

J. Electrochem. Soc.

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Various amounts of Ir (<20 μg cm −2 ) and Ru (up to 12 μg cm −2 ) on a consistent base Pt loading of 85 μg cm −2 , were sputter deposited on a nanostructured thin film catalyst support to mimic a hydrogen fuel cell's cathode catalyst. The nanostructured support was grown on glassy carbon disks designed for a rotating disk electrode, which was used to simulate what happens to a fuel cell cathode during repeated start-up, operation, and shut-down. The testing protocol subjected the catalyst to a minimum potential of 0.65 V RHE and a maximum between 1.53 and 1.8 V RHE . The upper potential was achieved with a galvanostatic hold which is an alternative way to simulate potential transients on the cathode caused by start-up and shut-down. Increasing Ir loading improved the durability of both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity. When combined with Ir, Ru provided no benefit to OER durability except at an Ir loading of 10 μg cm −2 . Ru addition (no Ir present) improved the ORR durability compared to pure Pt. ORR durability was not influenced by Ru addition to Ir-containing samples. In general, ORR durability showed no dependence on Ru loading for all the Ru containing samples and ORR activity was decreased by OER catalyst addition, though more so for Ir than Ru.

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“…carbon-containing electrodes are expected to be suitable for detection of organic compounds rather than for their 58 oxidation in wastewaters due to low potential for carbon corrosion [21] which is shown in the following reactions: …”

mentioning

confidence: 99%

Optimization of Ti/Ta2O5–SnO2 electrodes and reaction parameters for electrocatalytic oxidation of methylene blue

et al. 2016

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Relationship between carbon corrosion and positive electrode potential in a proton-exchange membrane fuel cell during start/stop operation

Cited by 144 publications

References 9 publications

A review on performance degradation of proton exchange membrane fuel cells during startup and shutdown processes: Causes, consequences, and mitigation strategies

A review on performance degradation of proton exchange membrane fuel cells during startup and shutdown processes: Causes, consequences, and mitigation strategies

Screening Bifunctional Pt Based NSTF Catalysts for Durability with the Rotating Disk Electrode: The Effect of Ir and Ru

Optimization of Ti/Ta2O5–SnO2 electrodes and reaction parameters for electrocatalytic oxidation of methylene blue

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