【摘要】 以高温合成法制备了FeS ,用电位扫描、旋转电极、恒电位电解等技术研究了FeS在电解液 0 .5mol/LH2 SO4 +0 .5mol/LK2 SO4 (2 5℃ ,pH =0 .70 )中的阳极氧化过程。结果表明 ,FeS阳极氧化过程遵循“活性氧化—钝化—活性氧化”规律 ,在 0 .7～ 1.4V(vsSCE)之间出现钝化区。第一个活性氧化区的Tafel方程为 η =0 .46 8+0 .0 2 89lnJ ,在高过电位区 ,FeS阳极反应受固相扩散传质步骤控制 ,有少量高价态的S化合物生成。更多还原

【Abstract】 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. [更多还原