Accelerated test analysis of reversal potential caused by fuel starvation during PEMFCs operation

Kang, Jungtak; Jung, Dong Won; Park, Soon; Lee, Jong‐Hyun; Ko, Jaejoon; Kim, Junbom

doi:10.1016/j.ijhydene.2010.01.071

Cited by 69 publications

(25 citation statements)

References 20 publications

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“…Here, the ECSA of the Pt catalyst was calculated by the hydrogen desorption area below 0.4 V. After the RP of 200 cycles, as shown in Figure 7(a) and (b), the ECSA in the anode of MEA-a decreased from 54.3 to 31.4 m 2 g -1 corresponding to a 42.2% reduction, whereas the ECSA in the cathode of MEA-a decreased by approximately 76.8%. The Pt catalyst in the cathode degraded more than that in the anode during the hydrogen starvation, which corroborates our previous results [13]. In the case of the MEA-b sample shown in Figure 7(c) and (d), the ECSAs of Pt catalysts in the anode and cathode decreased 53.5 and 25.2% after the RP of 500 cycles, respectively.…”

Section: Original Research Papersupporting

confidence: 90%

“…According to our results, PEMFC performance exhibited gradual degradation due to the agglomeration and sintering of the Pt catalyst by the corrosion (or oxidation) of the carbon support as the RP experiments of hydrogen starvation were repeated. In addition, an ECSA decrease by the COR in the cathode was more serious than that in the anode during the RP cycles [6,13].…”

Section: Introductionmentioning

confidence: 93%

“…Experimental systems for the RP cycle test are described in detail in our previous paper [13]. A single serpentine type gas flow channel as illustrated in Figure 1(b) was used in the PEMFC unit cell (Fuel cell Technologies Inc.) and its active area was 5 cm 2 .…”

Section: Accelerated Cell Rp Cycle Test By Hydrogen Starvationmentioning

confidence: 99%

“…In a previous study [13], we investigated the effects of fuel starvation using accelerated RP cycle experiments on the performance and durability of PEMFC. According to our results, PEMFC performance exhibited gradual degradation due to the agglomeration and sintering of the Pt catalyst by the corrosion (or oxidation) of the carbon support as the RP experiments of hydrogen starvation were repeated.…”

Section: Introductionmentioning

confidence: 99%

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Durability of Polymer Electrolyte Membrane Fuel Cell with Pt/CNTs Catalysts in Cell Reversal Conditions by Hydrogen Starvation

et al. 2011

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The durability of polymer electrolyte membrane fuel cell with Pt catalysts supported on carbon nanotube (CNT) was investigated after a few hundred accelerated cell reversal process (RP) cycles generated by hydrogen deficiency. A variety of characterization techniques, including cell performance tests, were applied to examine the effects of CNT support on the degradation of Pt catalysts: transmission electron microscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. During the RP cycle tests, most degradation by carbon corrosion occurred at the outlet region of membrane electrode assembly (MEA) where hydrogen starvation seriously occurred. By using the CNT as the support of Pt catalysts in the MEA cathode, carbon corrosion was reduced and growth of Pt particles by agglomeration and sintering significantly decreased. Compared to a commercial Pt/C catalyst, the cell durability of the Pt/CNT catalyst was enhanced under the RP condition.

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Section: Original Research Papersupporting

confidence: 90%

Section: Introductionmentioning

confidence: 93%

Section: Accelerated Cell Rp Cycle Test By Hydrogen Starvationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Durability of Polymer Electrolyte Membrane Fuel Cell with Pt/CNTs Catalysts in Cell Reversal Conditions by Hydrogen Starvation

et al. 2011

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“…These techniques can realize online detection of carbon dioxide generated by carbon corrosion. After cell reversal, energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM) [6], scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectrum (EIS), inductively coupled plasma (ICP), and Raman Spectroscopy are the main means used to characterize the status of the catalyst layer (CL), catalyst nanoparticles sintering, and carbon corrosion extent [10,[12][13][14][15]. These methods analyze CL morphology, catalyst distribution, elemental content, atomic structure, and impedance, respectively.…”

Section: Article In Pressmentioning

confidence: 99%

Proton Exchange Membrane Fuel Cell Reversal: A Review

et al. 2016

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Abstract:The H 2 /air-fed proton exchange membrane fuel cell (PEMFC) has two major problems: cost and durability, which obstruct its pathway to commercialization. Cell reversal, which would create irreversible damage to the fuel cell and shorten its lifespan, is caused by reactant starvation, load change, low catalyst performance, and so on. This paper will summarize the causes, consequences, and mitigation strategies of cell reversal of PEMFC in detail. A description of potential change in the anode and cathode and the differences between local starvation and overall starvation are reviewed, which gives a framework for comprehending the origins of cell reversal. According to the root factor of cell starvation, i.e., fuel cells do not satisfy the requirements of electrons and protons of normal anode and cathode chemical reactions, we will introduce specific methods to mitigate or prevent fuel cell damage caused by cell reversal in the view of system management strategies and component material modifications. Based on a comprehensive understanding of cell reversal, it is beneficial to operate a fuel cell stack and extend its lifetime.

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