Abstract

The overpotential of hydrogen evolution reaction is one of the aspects which results in low efficacy of water electrolysers. There is a constant search for new ways to improve the catalytic activity, especially of nickel-based materials. Addition of lanthanum results in synergism and high activity towards the hydrogen evolution reaction. Due to the application of deep eutectic solvents which are characterized by a wide electrochemical window and good solvent properties for metal ions, it was possible to deposit the lanthanum–nickel alloy coating which was composed of around 40% of La. Hydrogen evolution reaction conducted on this layer resulted in a reduction of overpotential by 129 mV in comparison to pure Ni layer at current density of 1 mA cm⁻². Other kinetic parameters, such as Tafel slope and exchange current density, were also significantly improved.

Graphic abstract

中文翻译：

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使用深共熔溶剂获得的Ni-La复合涂层及其电催化活性

摘要

氢释放反应的超电势是导致水电解槽效率低的方面之一。人们一直在寻找提高催化活性的新方法，特别是镍基材料。镧的加入导致协同作用和对氢释放反应的高活性。由于使用了深共晶溶剂，其特点是具有宽的电化学窗口和对金属离子的良好溶剂性能，因此可以沉积由大约40％的La组成的镧-镍合金涂层。与纯Ni层相比，在1 mA cm ^-2的电流密度下，该层导致过电位降低129 mV。其他动力学参数，例如塔菲尔斜率和交换电流密度，也得到了显着改善。

图形摘要