Membrane Degradation Mitigation of PEFC during Cold-Start Application of the Radical Quencher Ce3+-

Endoh, Eiji; Onoda, Naoto; Kaneko, Yasutaka; Takagi, Yasuo; Take, Tetsuo

doi:10.1149/2.004310eel

Cited by 21 publications

(11 citation statements)

References 2 publications

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“…Thus, Ce 3þ is more effective as a radical quencher than Ce 4þ . Our results are consistent with other reports [11,26], and our "SPES-Ce amount " composite membrane has the potential to function as a good radical quencher.…”

Section: Characterization Of Composite Membranessupporting

confidence: 93%

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Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Lee

Han

Choi

et al. 2015

Journal of Power Sources

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Section: Characterization Of Composite Membranessupporting

confidence: 93%

“…Endoh et al tried to prevent membrane degradation through the oxidation/reduction of Ce 3þ by the radicals; the radical quenching reactions are as follows [11]:…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Lee

Han

Choi

et al. 2015

Journal of Power Sources

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“…Fuel cell radicals such as • OH and • OOH bind to the Ce 3+ ion and subsequently undergo conversion to more innocuous species. 12,13 While promising, these ions exhibit migration within the membrane, diminishing their effectiveness over time. 6,14 Due to a set of pioneering experimental studies by Trogadas et al, CeO 2 nanoparticles ("ceria") have recently garnered interest as a radical scavenger for fuel cell membranes.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, the electrochemical formation of radical species, such as • OH and • OOH, at the electrode degrades the PEM, causing a decrease in membrane conductivity and leading to eventual membrane failure. − Researchers initially attempted to combat this degradation using Mn(II) and Ce(III) ions in the fuel cell, later discovering that Ce(III) was superior from a kinetic standpoint. , These ions boast an ability to rapidly cycle between a Ce 3+ and a Ce 4+ state. Fuel cell radicals such as • OH and • OOH bind to the Ce 3+ ion and subsequently undergo conversion to more innocuous species. , While promising, these ions exhibit migration within the membrane, diminishing their effectiveness over time. , …”

Section: Introductionmentioning

confidence: 99%

CeO₂(111) Surface with Oxygen Vacancy for Radical Scavenging: A Density Functional Theory Approach

et al. 2020

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CeO2 has been established as an effective scavenger for destructive oxygen radicals in fuel cell membranes. The effect of ceria (CeO2) surface defect on •OH and •OOH radical scavenging efficacy is investigated using density functional theory (DFT). Our calculations suggest that both •OH and •OOH can be bound to oxygen vacancies on the CeO2(111) surface. Intriguingly, binding to the triangular defect (•OH binding energy = −4.54 eV; •OOH binding energy = −3.20 eV) is more favorable than binding to the linear defect (•OH binding energy = −4.12 eV; •OOH binding energy = −2.80 eV). This is likely due to Coulombic repulsive interaction from the additional oxygen atom adjacent to the linear defect. This is also potentially due to the greater localization of electrons to defect-adjacent cerium atoms in the triangular defect, as demonstrated via a Mulliken population analysis. Confirming this observation, it is shown that the density of states (DOS) for the Ce 4f band undergoes a significant alteration near the Fermi level due to this electron localization. As such, it is demonstrated that the triangular defect possesses a superior radical scavenging capability compared to the linear defect. Based on the results of this study, we suggest that future experimental studies aim to synthesize ceria nanoparticles with a greater percentage of triangular defects to enhance the particle radical scavenging capability.

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“…In addition, the metal ions have been reported to lead to the following advantage: the presence of Ce 3þ or Mn 2þ ion can mitigate the degradation of the electrolyte membrane. [29][30][31] Based on these findings, metal ions are an important factor contributing to the PEFC performances. However, there are no reports describing the metal-ion effects on the Pt dissolution, especially, that in the presence of H 2 O 2 , to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Effects of metal ions on Pt electrode dissolution in H2SO4 solution enhanced by the presence of H2O2

Itaya¹,

Shironita²,

Nakazawa³

et al. 2014

Journal of Renewable and Sustainable Energy

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Successive potential cycling of a Pt plate electrode was conducted in H 2 O 2 -containing 0.5 mol dm À3 H 2 SO 4 in the presence of metal ions such as Fe (Fe 2þ , Fe 3þ ), Ce (Ce 3þ , Ce 4þ ), and Mn (Mn 2þ ) ions. First, the potential cycling in 294 mmol dm À3 H 2 O 2 þ 0.5 mol dm À3 H 2 SO 4 without any metal ions confirmed the weight loss of the Pt electrode, which implies Pt dissolution. When the metal ions were added to the solution, the Pt electrode dissolution during the potential cycling was very significant; the Pt weight sharply decreased in the presence of both Fe 2þ and H 2 O 2 . In addition, this enhanced Pt dissolution depended on both the Fe 2þ and H 2 O 2 concentrations, and the maximum Pt weight loss (257 lg) was obtained at the Fe 2þ and H 2 O 2 concentrations of 10 and 294 mmol dm À3 , respectively. The Fe 2þ and H 2 O 2 concentration dependences of the Pt dissolution also correlated with the consumption rate of H 2 O 2 . These results revealed that the Fe 2þ and H 2 O 2 synergically enhanced the Pt dissolution rate. V C 2014 AIP Publishing LLC.

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Membrane Degradation Mitigation of PEFC during Cold-Start Application of the Radical Quencher Ce3+-

Cited by 21 publications

References 2 publications

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

CeO₂(111) Surface with Oxygen Vacancy for Radical Scavenging: A Density Functional Theory Approach

Effects of metal ions on Pt electrode dissolution in H2SO4 solution enhanced by the presence of H2O2

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Membrane Degradation Mitigation of PEFC during Cold-Start Application of the Radical Quencher Ce3+-

Cited by 21 publications

References 2 publications

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

CeO2(111) Surface with Oxygen Vacancy for Radical Scavenging: A Density Functional Theory Approach

Effects of metal ions on Pt electrode dissolution in H2SO4 solution enhanced by the presence of H2O2

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CeO₂(111) Surface with Oxygen Vacancy for Radical Scavenging: A Density Functional Theory Approach