Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions
| Autor: | Borka M. Jović, M Radovic, Nedeljko V. Krstajić, Vladimir D. Jović, Uroš Lačnjevac, Sanja Stevanović, Janez Kovač |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Cyclic voltammetry
General Chemical Engineering Ti2AlC 02 engineering and technology 010402 general chemistry 01 natural sciences Analytical Chemistry law.invention chemistry.chemical_compound law Electrochemistry Hydrogen evolution Acid solution Electrodeposited Ru H-2 evolution Chemistry Metallurgy Sulfuric acid 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Dielectric spectroscopy Chemical engineering 0210 nano-technology Electrochemical impedance spectroscopy |
| Zdroj: | Journal of Electroanalytical Chemistry |
| ISSN: | 1572-6657 |
| Popis: | In this work, the hydrogen evolution reaction (HER) was studied on Ru coated Ti2AlC electrodes in 1.0 mol dm(-3) H2SO4 at 25 degrees C. Ti2AlC was found to be a highly stable substrate in sulfuric acid solutions due to the formation of a passivating oxide layer on the surface, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis of as-prepared and anodically treated Ti2AlC samples. Ru films were electrodeposited onto Ti2AlC substrates by cycling the potential of Ti2AlC in the solution containing 0.01 mol dm(-3) RuCl3 + 0.1 mol dm(-3) H2SO4 between -0.5 V and 0.4 V vs. a saturated calomel electrode (SCE) at the sweep rate of 20 mV s(-1). Four Ru/Ti2AlC samples were prepared, obtained at 5, 10, 15 and 20 cycles of Ru electrodeposition. Characterization of samples was performed by scanning electron microscopy (SEM) and cyclic voltammetry (CV), while the thickness of the electrodeposited Ru layers was determined by atomic force microscopy (AFM). It was found that the most compact sample with the thickness of about 0.42 mu m was obtained after 5 cycles. Electrochemical impedance spectroscopy (EIS) and steady-state polarization measurements showed that all Ru/Ti2AlC electrodes were exceptionally active for the HER. A Tafel slope of about -60 mV dec(-1) was observed on all polarization curves in the range of high cathodic current densities. Based on formal kinetics analysis, an appropriate mechanism for the HER on Ru/Ti2AlC was suggested. This is the peer-reviewed version of the article: Jovic, B. M., Jović, V. D., Lačnjevac, U., Stevanović, S., Kovac, J., Radovic, M.,& Krstajić, N. V. (2016). Ru layers electrodeposited onto highly stable Ti2AlC substrates as cathodes for hydrogen evolution in sulfuric acid solutions. Journal of Electroanalytical Chemistry, Elsevier, 766, 78-86. [https://doi.org/10.1016/j.jelechem.2016.01.038] The published version: [https://cer.ihtm.bg.ac.rs/handle/123456789/2012] |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect