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We have investigated the surface properties, such as electric conductivity, wettability, rate constant of H2O2 decomposition, and surface functional groups, of surface modified carbon black by low temperature oxygen plasma of dc glow discharge under various processing conditions. This work also describes the relationships between the surface properties and the electrochemical behavior in an aqueous KOH solution of the gas diffusion electrodes with oxygen plasma modified carbon black. The results are as follows: The conductivity of carbon black has decreased with the plasma output. The carbon black surface has changed from hydrophobic to hydrophilic. The plasma processing has enhanced the H2O2 decomposition ability of carbon black. These results can be explained by theincrease of oxygen-containing functional groups such as>C=O, -COOH etc. on carbon black surface. The polarization behavior of an oxygen electrode with carbon black has been much improved by the plasma processing. It can be attributed to the formation of the stable three phase zones owing to the moderate wettability, high H2O2 decomposition ability, and development of fine pores of the carbon black electrode

Oxygen Plasma Processing onto Carbon Black Surface for Gas Diffusion Electrode of Fuel Cell