Analysis of Hydrogen Feeding to the Anode of a PEMFC By a Transport Impedance Technique

Duque, Luis Fernando; Molinero, A.; Oller, J.C.; Barcala, José Miguel; Folgado, M. Antonia; Chaparro, Antonio M.

doi:10.1149/10909.0117ecst

Cited by 1 publication

(1 citation statement)

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“…Mass transport properties of a PEMFC electrode change by using a superhydrophobic CL due to increasing the water transport rate [53,54] . CH2S results in Figure 7 compare a cell with a commercial anode with a cell having electrosprayed CL with superhydrophobic character.…”

Section: Resultsmentioning

confidence: 99%

Study of Mass Transport in the Anode of a Proton Exchange Membrane Fuel Cell with a New Hydrogen Flow‐Rate Modulation Technique

Duque,

Molinero,

Oller

et al. 2024

ChemElectroChem

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Hydrogen transport in the anode of a proton‐exchange membrane fuel cell (PEMFC) has been studied with a modulation technique relating the hydrogen flow‐rate ( ) and the faradaic current ( ), called Current‐modulated Hydrogen flow‐rate Spectroscopy (CH2S). A simple analytical expression for the transfer function, H(jω)=n F / , is provided, showing a skewed semicircle in Nyquist representation (−H'' vs. H'), extending from H’=0 to H’=1, and with the maximum frequency at ωmax=2.33(DH2 /Li2), where DH2 is the effective hydrogen diffusivity and Li the thickness of the anode gas diffusion layer (GDL). The expression for CH2S is also calculated with an existing reversible chemical reaction in the GDL. Experimental results under different operation conditions show two transport processes limiting the anode reaction, one attributed to molecular diffusion through the partially saturated GDL, and the other to the microporous layer (MPL), or its interfaces with GDL or with the catalyst layer (CL). CH2S provides the hydrogen diffusivities (DH2,i) associated to each process under the different conditions. Current density decreases slightly the diffusivity of the GDL, while it becomes activated in the MPL; using two GDLs in the anode improves both GDL and MPL diffusivities; humidification decreases the diffusivity in both, GDL and MPL; finally, a superhydrophobic anodic CL prepared by electrospray improves hydrogen diffusivity in GDL and MPL.

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Section: Resultsmentioning

confidence: 99%