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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。
FeS was prepared by high-temperature synthesis method. The effects of FeS on the electrolyte (pH = 0.70, 0.5 mol / LH 2 SO 4 +0.5 mol / L K 2 SO 4) were studied by potentiometric scanning, rotating electrode and potentiostatic electrolysis ) In the anodic oxidation process. The results showed that the anodic oxidation process of FeS obeys the rule of “active oxidation - passivation - active oxidation”, and the passivation zone appears between 0. 7 ~ 1.4V (vsSCE). The Tafel equation of the first active oxidation zone is η = 0.46 8 +0. 0289lnJ. In the high overpotential zone, the FeS anode reaction is controlled by the solid-phase diffusion and mass transfer step with a small amount of high-valent S compounds.