WEB Metal-containing ceramic nanocomposites synthesized from metal acetates and polysilazane for energy storage and catalytic applicationsThursday (24.09.2020) 15:00 - 15:30 P: Processing and Synthesis 1 Part of:
Silicon-containing polymer-derived ceramics (PDCs) have shown the potential for a wide range of high-temperature applications due to their higher thermal stability, good corrosion and oxidation resistance, as well as excellent thermomechanical properties. Among them, metal-containing PDCs nanocomposites are of great interest in engineering fields because of their magnetic, electrical and catalytic properties . Metal-containing PDCs nanocomposites are usually synthesized via active fillers control pyrolysis (AFCOP) process by direct blending of preceramic precursors with active fillers of metal powders . The pyrolysis of organometallic polymers containing both organosilicon and metals in their structure is another approach to obtain Metal-containing PDCs nanocomposites . However, these two approaches are limited by the restricted variety of available precursors and active fillers as well as the toxicity of some precursors.
In this work, we synthesized metal-containing (Ni, Sn, Mn, Fe, Co, Cu, Zn and Ag) polysilazane precursors via one-step chemical reaction of metal acetates with poly(vinyl)silazane (Durazane 1800) in ice bath under argon atmosphere. This chemical modification approach is advantageous, owing to the very simple reaction condition (in ice bath under argon atmosphere), the use of rather inexpensive poly(vinyl)silazane (Durazane 1800) and easily accessible commercial metal acetate materials. The synthesized precursors were comprehensively characterized by ATR-FTIR, XPS and XANES to reveal the groups changes and metal valence status. Ceramic nanocomposites containing particles of either metals or metal silicides can be obtained after pyrolyzing synthesized metal-containing precursors between 700 and 1100 °C in argon atmosphere. Ni/SiOCN and Pd/SiOCN showed good catalytic properties for dry reforming of methane (DRM) reaction and Sn/SiOCN is found to be a promising electrode materials for lithium ion battery.
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