In operando activation of alkaline electrolyzer by ruthenium spontaneous deposition
| Autor: | Esteban A. Franceschini, Nadia S. Luna, Gabriela I. Lacconi, Gabriel Correa-Perelmuter, Liliana A. Diaz |
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| Rok vydání: | 2020 |
| Předmět: |
Electrolysis
Materials science Alkaline water electrolysis Inorganic chemistry chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences law.invention Ruthenium chemistry law Electrode Water splitting General Materials Science Electrical and Electronic Engineering 0210 nano-technology Hydrogen production |
| Zdroj: | Journal of Solid State Electrochemistry. 25:1019-1027 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-020-04857-y |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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