Selective Synthesis of Monodisperse CoO Nanooctahedra as Catalysts for Electrochemical Water Oxidation
| Autor: | Sergi Plana-Ruiz, Wolfgang Tremel, Massih Ahmad Sarif, Jörg Schemberg, Martin Panthöfer, Ibrahim Khan, Eva Pütz, Ute Kolb, Muhammad Ashraf, R.A. Harris, Muhammad Nawaz Tahir, Jan Hilgert |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Thermal decomposition Dispersity Oxygen evolution Nucleation Nanoparticle 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Chemical engineering General Materials Science Particle size 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir. 36:13804-13816 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.0c02131 |
| Popis: | Thermal decomposition is a promising route for the synthesis of metal oxide nanoparticles because size and morphology can be tuned by minute control of the reaction variables. We synthesized CoO nanooctahedra with diameters of ∼48 nm and a narrow size distribution. Full control over nanoparticle size and morphology could be obtained by controlling the reaction time, surfactant ratio, and reactant concentrations. We show that the particle size does not increase monotonically with time or surfactant concentration but passes through minima or maxima. We unravel the critical role of the surfactants in nucleation and growth and rationalize the observed experimental trends in accordance with simulation experiments. The as-synthesized CoO nanooctahedra exhibit superior electrocatalytic activity with long-term stability during oxygen evolution. The morphology of the CoO particles controls the electrocatalytic reaction through the distinct surface sites involved in the oxygen evolution reaction. |
| Databáze: | OpenAIRE |
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