Low-temperature synthesis and investigation into the formation mechanism of high quality Ni-Fe layered double hydroxides hexagonal platelets
Autor: | Daire Tyndall, Michelle P. Browne, Christopher Hobbs, Valeria Nicolosi, Sonia Jaśkaniec, João Coelho, Takayoshi Sasaki, Andrés Seral-Ascaso |
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Rok vydání: | 2018 |
Předmět: |
Materials science
lcsh:Medicine 02 engineering and technology Overpotential engineering.material 010402 general chemistry Electrocatalyst 01 natural sciences Article chemistry.chemical_compound medicine lcsh:Science Multidisciplinary lcsh:R Thermal decomposition Oxygen evolution Layered double hydroxides food and beverages 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering Triethanolamine Urea engineering Hydroxide lcsh:Q 0210 nano-technology medicine.drug |
Zdroj: | Universidade Nova de Lisboa Scientific Reports Scientific Reports, Vol 8, Iss 1, Pp 1-8 (2018) |
ISSN: | 2045-2322 |
DOI: | 10.1038/s41598-018-22630-0 |
Popis: | This paper describes the wet-chemistry synthesis of highly crystalline hexagonal flakes of Ni-Fe layered double hydroxide (LDH) produced at temperature as low as 100 °C. The flakes with diameter in the range of 0.5–1.5 μm and the thickness between 15 and 20 nm were obtained by homogeneous precipitation method with the use of triethanolamine (TEA) and urea. By analyzing the intermediate products, it is suggested that, differently from previous reports, a thermodynamically metastable iron oxyhydroxide and Ni-TEA complex are firstly formed at room temperature. Subsequently, when the mixture is heated to 100 °C and the pH increases due to the thermal decomposition of urea, Ni2+ and Fe3+ are slowly released and then recombine, thus leading to formation of pure, highly-crystalline Ni-Fe LDH flakes. This material showed promising results as an electrocatalyst in oxygen evolution reaction (OER) providing an overpotential value of 0.36 V. |
Databáze: | OpenAIRE |
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