| Autor: |
R. Brahimi, Akila Belhadi, L. Boudjellal, Mohamed Trari, S. Boumaza |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Springer Proceedings in Energy ISBN: 9789811565946 |
| DOI: |
10.1007/978-981-15-6595-3_44 |
| Popis: |
Ternary oxides are practically employed in most technological fields and continue to attract much interest because of their low cost and simple preparation. In this work, we have synthesized La2NiO4 by sol-gel method and characterized by X-ray diffraction, BET surface area, SEM analysis, laser granulometry and electrical conductivity. The XRD pattern shows that the pure La2NiO4 is obtained beyond 900 °C. The BET measurements give relatively a small surface area (10 m2 g−1). The elemental chemical analysis by laser granulometry, confirmed the agglomerated nature of the synthesized powder observed by SEM analysis and attributed to the fine powder obtained by sol-gel method. The diffuse reflectance gives an optical gap of 1.3 eV, in agreement with the dark color. The transport properties show a semi-conductor behavior with p-type conductivity and activation energy of 44 meV. The results of the absorption analysis show that La2NiO4 exhibits an excellent chemical stability in the pH range (6–14). The capacitance measurement (C−2-E) in basic electrolyte reveals a linear behavior from which a flat band potential of 0.1 VSCE is obtained. La2NiO4 is tested successfully as photocatalyst for the hydrogen production upon visible light and the best performance is obtained in alkaline solution (NaOH 0.1 M, Na2S2O3 10−3 M) with an average rate of 23.6 μmol mn−1 (g catalyst)−1. The system shows a tendency toward saturation whose deceleration is the result of the competitive reduction of the end product S4O62−. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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