不锈钢基氧化电极的水分解性能研究

Study on the Water Decomposition Performance of Stainless Steel-Based Oxidation Electrode

由水热氧化法在NaOH介质中处理316 L不锈钢制备得到水分解催化电极,研究了反应时间对催化性能的影响规律,并分析了相关催化机理。结果表明:36 h水热氧化反应得到的电极综合性能最佳,可在过电位为123/258 mV条件下达到10 mA•cm−2的HER/OER电流密度。水热氧化前期不锈钢表面主要生成富镍纳米晶氧化膜,后期则逐渐生成富铁微米晶催化层顶层,该双层催化膜结构赋予了电极优异的催化活性。

The catalytic electrodes for water decomposition were prepared by hydrothermal oxidation of 316 L stainless steel by hydrothermal oxidation treatment in sodium hydroxide medium. The influence of reaction time on catalytic performance was investigated, and the related catalytic mechanism was discussed. The results show that the electrode obtained from a hydrothermal oxidation reaction of 36 hours has the best performance, and could reach a HER/OER current density of 10 mA•cm−2 under a low overpotential of 123/258 mV, respectively. In the early stage of hydrothermal oxidation, a nickel-rich nanocrystalline oxide film was mainly formed on the surface of stainless steel, while in the later stage, an iron-rich microcrystalline catalytic layer top layer was gradually formed, and the double-layer catalytic membrane structure endowed the electrode with excellent catalytic activity.