Tailoring electrochemical efficiency of hydrogen evolution by fine tuning of TiOx/RuOx composite cathode architecture
| Autor: | N. M. Ushakov, Alexander Rashkovskiy, Maxim Panov, Dmitry P. Rupasov, Albert G. Nasibulin, Mikhail Yu. Vasilkov, Rolf Hempelmann, Fedor S. Fedorov, Tanja Kallio, Jaeho Lee |
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| Přispěvatelé: | Skolkovo Institute of Science and Technology, Saratov State Technical University, Kotel'nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences, Korea Institute of Science and Technology Europe, Department of Chemistry and Materials Science, Department of Applied Physics, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Ruthenia Energy Engineering and Power Technology Wavelet analysis 02 engineering and technology Electrolyte 010402 general chemistry Electrochemistry 01 natural sciences Spectral line law.invention Catalysis law ta215 Electrolysis of water Renewable Energy Sustainability and the Environment Titania nanotubes Water electrolysis 021001 nanoscience & nanotechnology Condensed Matter Physics Composite cathode Hydrogen evolution reaction Cathode 0104 chemical sciences Fuel Technology Chemical engineering 0210 nano-technology Current density Layer (electronics) |
| Zdroj: | International Journal of Hydrogen Energy. 44:10593-10603 |
| ISSN: | 0360-3199 |
| Popis: | Here we report an approach to design composite cathode based on TiO x nanotubes decorated with RuO x nanowhiskers for efficient hydrogen evolution. We tailor catalytic activity of the cathodes by adjustment of morphology of TiO x nanotubular support layer along with variation of RuO x loaded mass and assess its performance using electrochemical methods and wavelet analysis. The highest energy efficiency of hydrogen evolution is observed in 1 M H 2 SO 4 electrolyte to be ca. 64% at −10 mA/cm 2 for cathodes of the most developed area, i.e. smaller diameter of tubes, with enhanced RuO x loading. The efficiency is favored by detachment of small hydrogen bubbles what is revealed by wavelet analysis and is expressed in pure noise at wavelet spectrum. At increased current density, −50 or −100 mA/cm 2 , better efficiency of composite cathodes is supported by titania nanotubes of larger diameter due to an easier release of large hydrogen bubbles manifested in less periodic events appeared in the frequency region of 5–12 s at the spectra. We have shown that efficiency of the catalysts is determined by a pre-dominant type of hydrogen bubble release at different operation regimes depending on specific surface and a loaded mass of ruthenia. |
| Databáze: | OpenAIRE |
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