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In operando activation of alkaline electrolyzer by ruthenium spontaneous deposition
Journal of Solid State Electrochemistry ( IF 2.5 ) Pub Date : 2020-11-25 , DOI: 10.1007/s10008-020-04857-y
Nadia S. Luna , Gabriel Correa-Perelmuter , Gabriela I. Lacconi , Liliana A. Diaz , Esteban A. Franceschini

Conventional alkaline electrolyzers used for water splitting can considerably increase their efficiency upon modification of the surface of the electrode. Here we present in operando evidence of activation of a conventional alkaline electrolyzer using nickel electrodes modified by spontaneous deposition of ruthenium (1 × 10−5 M in 30% w/v KOH electrolyte). Surface modifications were analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Conventional electrochemical techniques were used to establish the kinetic and thermodynamic parameters of hydrogen generation before and after the spontaneous deposition of Ru. Changes on the nickel electrodes by direct modification of the electrolyte allowed to reduce the potential at minimum current from 1.64 to 1.00 V under the same operating conditions. That is, a considerable increase in the electrolysis efficiency was attained by reducing the activation overvoltage. Thus, using a simple, inexpensive, and reproducible method, it is possible to increase the efficiency of conventional electrolyzers.



中文翻译:

在操作中通过钌自发沉积激活碱性电解槽

用于水分解的常规碱性电解槽可在修饰电极表面时大大提高其效率。在这里,我们在操作中提供了激活常规碱性电解槽的证据,该电解槽使用通过自然沉积钌(1×10 -5M在30%w / v KOH电解质中)。通过扫描电子显微镜,能量色散X射线光谱和X射线衍射分析表面改性。使用常规的电化学技术确定在Ru自发沉积之前和之后产氢的动力学和热力学参数。在相同的工作条件下,通过直接修饰电解质来改变镍电极,可以将最小电流下的电势从1.64 V降低至1.00V。即,通过降低活化过电压实现了电解效率的显着提高。因此,使用简单,廉价且可再现的方法,可以提高常规电解器的效率。

更新日期:2020-11-27
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