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Electrochemistry of FeS anodic oxidization

FeS was synthesized with Fe and S at high temperature. The electrochemical techniques, such as potential sweep, rotated disc electrode, and coulometry, were employed to probe the anodic oxidization behavior of FeS in the solution of 0.5 mol/L H 2SO 4+0.5 mol/L K 2SO 4(0.25 ℃, pH=0.70). Experimental results demonstrated that the anodic oxidization behavior obeys the mode of activation oxidization—passivation—activation oxidization. Passivation occurs in the range of 0.7～1.4 V(vs SCE). The Tafel equation for the first activation oxidization zone is η =0.468+0.0289 ln J . Under the condition of higher over potential, the anodic reactions are controlled by the step of the Fe solid diffusion. The products in anodic process are Fe 3+ and S, and a small amount of sulfur compound with high valence is produced under higher over potential. [