Low-Pressure Plasma Synthesis of Ni/C Nanocatalysts from Solid Precursors: Influence of the Plasma Chemistry on the Morphology and Chemical State
| Autor: | Emile Haye, Yan Busby, Laurent Houssiau, Mathieu da Silva Pires, Florian Bocchese, Nathalie Job, Jean-Jacques Pireaux |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
inorganic chemicals
Materials science photoelectron spectroscopy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis optical emission spectroscopy X-ray photoelectron spectroscopy organometal General Materials Science low-pressure plasma nickel nanoparticles surface functionalization 021001 nanoscience & nanotechnology Nanomaterial-based catalyst 0104 chemical sciences Nickel Chemical state chemistry Chemical engineering Surface modification nanocatalysts Chemical stability 0210 nano-technology Carbon |
| Zdroj: | ACS Applied Nano Materials. 1:265-273 |
| ISSN: | 2574-0970 |
| DOI: | 10.1021/acsanm.7b00125 |
| Popis: | Nanocatalyst materials based on metal nanoparticles (NPs) deposited on mesoporous carbon substrates are widely used in catalysis and energy storage; however, conventional wet-chemical deposition methods based on the reduction of metal salts are not always the best choice when looking for a process ensuring easy scalability and low environmental impact. Moreover, additional surface functionalization steps, such as the addition of nitrogen- or oxygen-containing groups, are more and more explored to increase the activity or the chemical stability of catalysts. In this work, we investigate a new methodology for the fabrication of nickel/carbon nanocatalysts relying on a low-pressure radio frequency plasma treatment of solid (powder) precursors. A mesoporous carbon xerogel is used as support for nickel NPs synthesized through the decomposition of an organometallic nickel precursor in a plasma discharge. Different plasma treatment conditions and chemical environments are applied by varying the plasma power and the gas mixture injected into the plasma chamber (Ar, N2, NH3, and O2). The nucleation kinetics of nickel NPs, their morphology evolution, and chemical state were fully characterized by combining analytical techniques such as in situ optical emission spectroscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Results indicate that the plasma chemistry and conditions strongly influence the organometallic compound decomposition as well as the size and the oxidation state of the homogeneously dispersed nickel NPs. We compare the organometallic precursor degradation efficiency for each plasma by defining a rational “activation power” associated with each plasma chemistry. Moreover, simultaneous carbon substrate functionalization is obtained through plasma treatment, which demonstrates the high versatility of the plasma fabrication for developing green and efficient catalysts and energy materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|