Pd-rich Pd-Pt-Ru alloys, obtained by electrodeposition, were characterized by microscopic and electrochemical techniques at room temperature (298 K). The influence of the electrode potential and bulk composition on the amount of electrosorbed hydrogen was studied in 0.5 M H₂SO₄ aqueous solutions and compared with the behavior of Pd-Rh-Ru alloys under identical experimental conditions. The maximum hydrogen absorption capacities gradually decreased with increasing total amounts of both Pt and Ru in the alloy bulk. The effects of both Pd bulk content and the relative proportions between other components in Pd-Pt-Ru and Pd-Rh-Ru electrodes are also responsible for the changes in maximum hydrogen absorption capacity, the decrease in the potential of the alpha-beta phase transition, and the decrease in the absorption/desorption hysteresis. During voltammetric cycling in 0.5 M H₂SO₄ in the potential range − 0.1÷1.5 V vs. RHE (scan rate 0.1 V/s), the freshly obtained deposits became enriched with Pt due to electrodissolution of Ru and Pd, and the electrode morphology was also altered due to hydrogen electrosorption and surface oxidation.

Graphical Abstract

通过电沉积获得的富含Pd的Pd-Pt-Ru合金，在室温（298 K）下通过微观和电化学技术进行了表征。在0.5 MH ₂ SO _4中研究了电极电势和本体组成对电吸附氢量的影响水溶液，并与Pd-Rh-Ru合金在相同实验条件下的行为进行了比较。随着合金块中Pt和Ru总量的增加，最大氢吸收能力逐渐降低。Pd的体积含量以及Pd-Pt-Ru和Pd-Rh-Ru电极中其他组分之间的相对比例的影响也是最大吸氢量变化，α-β相电位下降的原因过渡，吸收/解吸滞后的减少。在0.5 MH ₂ SO _4中的伏安循环期间 在电位范围-0.1÷1.5 V与RHE（扫描速率0.1 V / s）之间，由于Ru和Pd的电溶解，新获得的沉积物富含Pt，并且由于氢的电吸附作用和表面，电极形态也发生了变化氧化。

图形概要