Performance of a PEM fuel cell cathode catalyst layer under oscillating potential and oxygen supply

Kulikovsky, Andrei

doi:10.1016/j.elecom.2023.107655

Cited by 2 publications

(4 citation statements)

References 12 publications

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“…Simultaneous in-phase oscillations of the oxygen concentration and overpotential applied at the CCL/GDL interface has been a key assumption in Ref. 3. Here, we show what happens to the OC phase if this boundary condition is applied at the channel/ GDL interface.…”

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confidence: 72%

Communication—Oscillating Oxygen Concentration Transport through PEM Fuel Cell Gas Diffusion Layer: Variation of the Phase Angle

Kulikovsky

2024

ECS Adv.

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Recently, it was shown that performance of the cathode catalyst layer in a PEM fuel cell dramatically improves if the oxygen concentration (OC) at the catalyst/gas diffusion layer (GDL) interface oscillates in--phase with the overpotential. However, OC oscillations could only be organized in the cathode channel. Does transport through the GDL affect the phase angle of OC oscillations? Below, it is shown thatat frequencies below 1 Hz, the GDL does not change this phase angle. At high frequencies, the phase angle after transport through the GDL is $-3\pi/4$ regardless of the GDL transport parameters.

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confidence: 72%

Communication—Oscillating Oxygen Concentration Transport through PEM Fuel Cell Gas Diffusion Layer: Variation of the Phase Angle

Kulikovsky

2024

ECS Adv.

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“…The other parameters for the calculations are gathered in Table . Qualitatively, the effect of k on the cell impedance in Figure a is similar to the effect at low cell current: the impedance modulus and the static CCL resistivity decrease with the increase in k . Figure b shows that with the growth of k , the oxygen diffusion peak vanishes, while the right faradaic “shoulder” transforms into a distinct peak, which decreases in the amplitude.…”

Section: Resultsmentioning

confidence: 99%

“…In ref , it was additionally assumed that the oxygen transport in the CCL is fast. Here, this assumption is lifted, allowing us to rationalize the effects at large cell current, when decay of the static oxygen concentration toward the membrane is significant.…”

Section: Model For the Catalyst Layer Impedancementioning

confidence: 99%

“…Recently, it has been shown that simultaneously applied inphase oscillations of the ORR overpotential and oxygen concentration at the catalyst/gas diffusion layer (GDL) interface dramatically reduce the CCL impedance and static resistivity. 11 Such an EIS-like technique is an interesting option for reduction of the system resistivity rather than the purely diagnostic method.…”

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confidence: 99%

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Reduction of PEM Fuel Cell Impedance and Resistivity under Simultaneously Applied Oscillations of Potential and Oxygen Supply

Kulikovsky

2024

J. Phys. Chem. C

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Recent model (Electrochem. Comm. 2024, 159, 107655) reveals dramatic decrease of the PEM fuel cell cathode catalyst layer (CCL) impedance under oxygen supply oscillating inphase with the overpotential. Here, a more accurate model for the CCL impedance is developed, and expressions for the static CCL resistivity and polarization curve are derived. The results demonstrate that the resonance pumping of the oxygen concentration at the CCL/ GDL interface with the concentration-to-overpotential amplitude factor k > 0 transfers the CCL to a new steady state with the resistivity and overpotential reduced by a factor ∼(1 + k) in the lowcurrent limit and by (1 + 2k) at high cell currents. To verify the effect in practically relevant conditions, PEM fuel cell impedance is calculated using our 1d + 1d model, assuming that the inlet oxygen concentration oscillates in-phase with the overpotential. The model includes oxygen transport in the channel and gas-diffusion layer and proton transport in the CCL. The results confirm significant reduction of the cell resistivity, provided that the air flow stoichiometry is large.

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Performance of a PEM fuel cell cathode catalyst layer under oscillating potential and oxygen supply

Cited by 2 publications

References 12 publications

Communication—Oscillating Oxygen Concentration Transport through PEM Fuel Cell Gas Diffusion Layer: Variation of the Phase Angle

Communication—Oscillating Oxygen Concentration Transport through PEM Fuel Cell Gas Diffusion Layer: Variation of the Phase Angle

Reduction of PEM Fuel Cell Impedance and Resistivity under Simultaneously Applied Oscillations of Potential and Oxygen Supply

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