The present work is focused on revealing the structural, textural and electrochemical characteristics of the carbon phases developed during the pyrolysis of commercial preceramic precursors in the presence of cobalt. At intermediate pyrolysis temperature, Cobalt is capable of forming labile carbides into the preceramic polymer network that, upon decomposition, lead to the formation of ordered carbonaceous structures during the thermal conversion. Etching with HF removes the undesirable SiO₂-like phase allowing, for the first time, to detect the presence of Co-carbon nano-onions (Co@CNO) in silicon oxycarbide ceramers. These ordered Co@CNO were formed at pyrolysis temperatures ranged between 700 and 800 °C but a further increase of the temperature induces a significant disorder into the carbon phase and incorporation of the C in the ceramic structure, as deduced from the spectroscopic characterization of these materials.

本工作着重于揭示在钴存在下商业陶瓷前体热解过程中形成的碳相的结构，组织和电化学特性。在中间热解温度下，钴能够将不稳定的碳化物形成到陶瓷前聚合物网络中，该碳化物分解后会导致在热转化过程中形成有序的碳质结构。用HF蚀刻除去不希望的SiO _2。样相首次允许在碳氧化硅陶瓷体中检测到钴碳纳米洋葱（Co @ CNO）的存在。这些有序的Co @ CNO是在700至800°C的热解温度下形成的，但温度的进一步升高会引起碳相中明显的无序化，以及C在陶瓷结构中的掺入，这是由这些光谱的表征得出的。材料。