At different diffusion-polarization electrodes, the electrolyte fill-level and distribution were investigated. The major results are listed below.

a) Electrolyte filling to the primary pores is related to utilization of Pt clusters only, and is independent to gas-diffusion loss.

b) Electrolyte filling to the secondary pores inhibits gas diffusion to reaction sites, and brings an increase of gas-diffusion loss.

c) Preferable electrolyte fill-level is clarified, i.e., ca. 3.7mA/cm2 in the double-layer charging current or ca. 16% of electrolyte fill-level in the secondary pores.

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