Analysis of electrocatalyst degradation in PEMFC caused by cell reversal during fuel starvation

Taniguchi, Atsushi; Akita, Tomoki; Yasuda, Kazuaki; Miyazaki, Yoshinori

doi:10.1016/j.jpowsour.2003.12.035

Cited by 509 publications

(333 citation statements)

References 18 publications

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“…Under such a high potential, the carbon supports would severely corrode. [7][8][9] As seen in Figure 8 a, the carbon support shows a significant increase in the oxidation current after a potential hold at 1.6 V for 10 h. In addition, the large redox couple at 0.6 V strongly suggests that severe carbon corrosion has occurred. In contrast, only a negligible change in the CV is observed for WO 3 (Figure 8 b), indicating good resistance towards oxidation when subjected to high potentials.…”

Section: Electrochemical Propertiesmentioning

confidence: 87%

“…Carbon support oxidation, however, also occurs at the anode side. When fuel starvation occurs, hydrogen oxidation is no longer sufficient to maintain the current, and then the anode potential can reach as high as 1.6 V. [7][8][9] Such a high potential would accelerate the kinetics of electrochemical carbon corrosion at the anode and lead to significant degradation of the fuel cell. In addition, the carbon corrosion at the anode could weaken the attachment of Pt particles to the carbon support and decrease the electronic continuity of the catalyst layer.…”

Section: Introductionmentioning

confidence: 99%

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A Highly Stable Anode, Carbon‐Free, Catalyst Support Based on Tungsten Trioxide Nanoclusters for Proton‐Exchange Membrane Fuel Cells

et al. 2012

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Durability is an important issue in proton‐exchange membrane fuel cells (PEMFCs). One of the major challenges lies in the degradation caused by the oxidation of the carbon support under high anode potentials (under fuel starvation conditions). Herein, we report highly stable, carbon‐free, WO3 nanoclusters as catalyst supports. The WO3 nanoclusters are synthesized through a hard template method and characterized by means of electron microscopy and electrochemical analysis. The electrochemical studies show that the WO3 nanoclusters have excellent electrochemical stability under a high potential (1.6 V for 10 h) compared to Vulcan XC‐72. Pt nanoparticles supported on these nanoclusters exhibit high and stable electrocatalytic activity for the oxidation of hydrogen. The catalyst shows negligible loss in electrochemically active surface area (ECA) after an accelerated durability test, whereas the ECA of the Pt nanoparticles immobilized on conventional carbon decreases significantly after the same oxidation condition. Therefore, Pt/WO3 could be considered as a promising alternative anode catalyst for PEMFCs.

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Section: Electrochemical Propertiesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

A Highly Stable Anode, Carbon‐Free, Catalyst Support Based on Tungsten Trioxide Nanoclusters for Proton‐Exchange Membrane Fuel Cells

et al. 2012

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“…Carbon corrosion, however, is also critical at the anode side. When fuel starvation happens, hydrogen is no longer sufficient to be oxidized to maintain the current, raising the anode potential to as high as 1.6 V [6][7][8][9]. At such high potentials, carbon oxidation would be initiated and consequently cause the degradation of the cell performance.…”

Section: Introductionmentioning

confidence: 99%

SnO2 nanocluster supported Pt catalyst with high stability for proton exchange membrane fuel cells

Dou

Hou

Liang³

et al. 2013

Electrochimica Acta

101

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“…For instance, Figure 3 shows platinum activity reduced by cell reversal as a result of fuel starvation after only 1 second of operation. 28% loss of ECSA was observed after 3 minutes of operation [52]. Furthermore, platinum particle size distribution increased from an average of 2.64 to 4.95 nm after 10 minutes of fuel starvation due to platinum sintering caused by cell reversal [52].…”

Section: Factors Influencing Pemfc Life Under Aeronautic Conditionsmentioning

confidence: 98%

PEMFC for aeronautic applications: A review on the durability aspects

et al. 2017

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Proton exchange membrane fuel cells (PEMFC) not only offer more efficient electrical energy conversion, relative to on-ground/backup turbines but generate by-products useful in aircraft such as heat for ice prevention, deoxygenated air for fire retardation and drinkable water for use on-board. Consequently, several projects (e.g. DLR-H2 Antares and RAPID2000) have successfully tested PEMFC-powered auxiliary unit (APU) for manned/unmanned aircraft. Despite the progress from flying PEMFC-powered small aircraft with 20 kW power output as high as 1 000 m at 100 km/h to 33 kW at 2 558 m, 176 km/h [1-3], durability and reliability remain key challenges. This review reports on the inadequate understanding of behaviour of PEMFC under aeronautic conditions and the lack of predictive methods conducive for aircraft that provide real-time information on the State of Health of PEMFCs. Highlights: The main research findings are -To minimize performance loss due to high altitude and inclination by adjusting cathode stoichiometric ratio. -To improve quality of oxygen-depleted air by controlling operating temperature and stoichiometric ratio. -Need to devise real time prediction methods conducive for determining PEMFC SoH in aircraft.

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Analysis of electrocatalyst degradation in PEMFC caused by cell reversal during fuel starvation

Cited by 509 publications

References 18 publications

A Highly Stable Anode, Carbon‐Free, Catalyst Support Based on Tungsten Trioxide Nanoclusters for Proton‐Exchange Membrane Fuel Cells

A Highly Stable Anode, Carbon‐Free, Catalyst Support Based on Tungsten Trioxide Nanoclusters for Proton‐Exchange Membrane Fuel Cells

SnO2 nanocluster supported Pt catalyst with high stability for proton exchange membrane fuel cells

PEMFC for aeronautic applications: A review on the durability aspects

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