Double layer capacitance of gas-diffusion electrodes made of acetylene black and expanded natural graphites and evaluation of the surface area wetted by the electrolyte

Cyclic voltammetry was used to determine the capacitance of the double layer in hydrophobized porous gas-diffusion electrodes made of acetylene black and expanded natural graphites. The average radius of pores by with an alkaline electrolyte, the area of these pores, and the true current density in electro-reduction of oxygen were evaluated.