Sol – gel synthesis, structural characterization and bifunctional catalytic activity of nanocrystalline delafossite CuGaO2 particles
| Autor: | Saad M. Alshehri, Viktor V. Poltavets, Tansir Ahamad, Jai Prakash, Jahangeer Ahmed |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Electrolysis of water Mechanical Engineering Metals and Alloys Nanoparticle Nanotechnology 02 engineering and technology Electrolyte engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nanocrystalline material 0104 chemical sciences Catalysis chemistry.chemical_compound Delafossite chemistry Chemical engineering Mechanics of Materials Materials Chemistry engineering 0210 nano-technology Bifunctional Sol-gel |
| Zdroj: | Journal of Alloys and Compounds. 688:1157-1161 |
| ISSN: | 0925-8388 |
| Popis: | Nanoparticles of CuGaO 2 delafossite were successfully synthesized from the sol – gel process by controlling the atmospheric conditions at 850 °C. The average size of CuGaO 2 nanoparticles of ∼40 nm was determined by transmission electron microscopy. Note that the thermodynamically stable conditions for CuGaO 2 delafossite synthesis are 1100 °C and 1200 °C in nitrogen and air atmosphere, respectively, while our methodology stabilizes the CuGaO 2 particles in the nano-metric region at low temperature (i.e. 850 °C). Moreover, delafossites CuGaO 2 nanoparticles show very interesting bifunctional catalytic activity in the electrolysis of water with O 2 and H 2 generation at anodic and cathodic potentials respectively. The current densities of CuGaO 2 nanoparticles as the bifunctional catalysts were found to be 15 mA/cm 2 and 18 mA/cm 2 for H 2 and O 2 generation, respectively, using 0.5 M KOH solution as an electrolyte versus Ag/AgCl electrode. |
| Databáze: | OpenAIRE |
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