Analytical Model for Concentration (Pressure) Impedance of a Low-Pt PEM Fuel Cell Oxygen Electrode

Round 1

Reviewer 1 Report

After read the manuscript of the communication membranes-1638657, titled “Analytical model for concentration (pressure) impedance of a low–Pt PEM fuel cell oxygen electrode”, my consideration is de manuscript can be published.

In this work, the author develops a model obtaining an analytical solution for zeta-impedance to use it as fast fitting experimental zeta-sperctra. The author presentS a very right manuscript, with clear and concise goal and conclusions.

Author Response

I am grateful to the Referee for the positive evaluation of my work.

Reviewer 2 Report

In this work, the authors reported a detailed analytical model for the concentration (pressure) impedance of a low-Pt PEM fuel cell oxygen electrode. To deeply analyze the stimulation of oxygen transport through the catalyst layer with using as low Pt content. This study is interesting in the theoretical understanding of the EIS spectrum model. There are some minor issues to be addressed before being accepted in Membranes.   

This manuscript could be improved by addressing the following issues.

1. The authors assumed oxygen consumption is high and proton transport is faster. However, the authors can explain how it could be lower at the cathode catalysts layer.
2. The authors could discuss how much the D_N and D_P are varied from Figures 2 and 3.
3. Authors can also include electrochemical characterization details for the weight % analysis. Suppose the low Pt contents attain the exact Tafel slope value of 30 mV dec ^-1. Authors can include mass activity and specific activity for the same samples. It will be easier for the experimental researcher’s reference (1016/j.apcatb.2021.120405).
4. In conclusion, authors can conclude more points on experimental measuring discussions.

Author Response

(see a file attached)

Author Response File: Author Response.pdf