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How is the mass-transfer limitation for hydrogen evolution?  Evolved hydrogen might be trapped in the carbon clothes and the Tafel slope can be considered to be just apparent values.  Practically, the Tafel plots are deviated from linear lines for < 1 mA/cm2, and the important region indicating the kinetic parameters (Tafel slopes) should be < 1 mA/cm2.  The authors have to consider the mass-transfer limitation for such high current density.  

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