Knowledge of the properties of metallurgical waste is essential for the assessment of their recycling. In this work, the formation of iron oxide nanolayers during voltammetric cycling in 1 M NaOH on the particle surface of blast furnace sludge after acid leaching (BFSL) was studied. Most importantly, the effect of hydrogen on these processes was of particular interest. For these purposes, the study combines electrochemical methods, cyclic voltammetry on solid and carbon paste electrodes, with analytical optical methods (TEM). On the solid iron electrode surface as a model system, nanostructured magnetite (Fe₃O₄) was identified as the main oxidation product, and, to a lesser extent, also maghemite (γ-Fe₂0₃). It was found that the charges corresponding to Fe₃O₄ formation and its reduction together with the hydrogen evolution reaction (HER) occurring at E = − 1500 mV depend on the number of cycles and have a similar course. Additionally, in the first phase of the cycling, the accumulation of maghemite on the solid Fe-electrode surface during cycling affects the growth of the oxide layer and catalytically increases the yield of the HER. Concerning the measurement with BFSL-modified CPE, on the BFSL surface, haematite is transformed into magnetite during cycling, resulting in the same Fe₃O₄ nanolayer as on the solid iron electrode. In this layer, the same redox processes take place, including the influence of hydrogen in the initial stage of cycling.

了解冶金废料的性质对于评估其回收率至关重要。在这项工作中，研究了酸浸（BFSL）后高炉污泥颗粒表面在1 M NaOH中的伏安循环中氧化铁纳米层的形成。最重要的是，氢对这些过程的影响特别令人关注。为此，本研究将电化学方法，固体和碳糊电极上的循环伏安法与分析光学方法（TEM）相结合。在固体铁电极表面作为模型系统，纳米结构的磁铁矿（铁₃ ö ₄）被确定为主要的氧化产物，以及，在较小程度上，也磁赤铁矿（γ-的Fe ₂ 0 ₃）。已经发现，对应于Fe ₃ O _4的形成和还原的电荷以及在E  =-1500 mV处发生的析氢反应（HER）取决于循环次数，并且具有相似的过程。另外，在循环的第一阶段中，在循环期间磁赤铁矿在固态铁电极表面上的积累影响了氧化物层的生长，并催化增加了HER的产率。关于用BFSL改性的CPE进行测量，在BFSL表面上，赤铁矿在循环过程中转变为磁铁矿，得到相同的Fe ₃ O _4。固态铁电极上的纳米层。在这一层中，会发生相同的氧化还原过程，包括循环初期的氢影响。