Synthesis and characterization of Ce/SiOC nanocomposites through the polymer derived ceramic method and evaluation of their catalytic activity

García, Beatriz; Casado, Eva; Tamayo, Aitana

doi:10.1016/j.ceramint.2019.09.099

Cited by 10 publications

(5 citation statements)

References 55 publications

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“…[9][10][11][12][13][14] Combining PDCs with intermetallic or metallic nanoparticles (NPs) on the molecular level before pyrolysis can extend the applications in catalytic and other areas. For example, García et al [15] reported that the novel Ce/SiOC composite via the polymer-derived route performed porous thermocatalysts, which produced the maximum amount of CO gas at 1200-1300 °C. Silva et al [14] prepared the porous Co/Ni-SiOC(N) ceramic that exhibited superior electrocatalytic performance for the oxygen reaction reduction under acidic, neutral, and alkaline conditions.…”

Section: Introductionmentioning

confidence: 99%

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

et al. 2023

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A facile and novel processable method to synthesize the Ni nanoparticles (Ni NPs) by tailoring their size in the matrix of the silicon oxycarbide (SiOC) ceramic system is reported. This method is based on polymer‐derived ceramics (PDCs), instead of the conventional powder route. The specific structural characteristics and magnetic properties of the various Ni NPs/SiOC composites as a function of carbon content are systematically investigated. The magnetic properties are experimentally investigated as a function of NP size and measurement temperature. It is demonstrated that the change in the size of Ni NPs (average from ≈4 to ≈ 19 nm) determines the magnetic nature of superparamagnetism. Zero‐field‐cooled (ZFC) and field‐cooled (FC) magnetization studies under magnetic fields of 100 Oe are performed. The saturated M versus H (M–H) loops (saturation magnetization) increase and the coercivity decreases with the size reduction of Ni NPs. It is an indicator of the presence of superparamagnetic behavior and single‐domain NP for ceramic materials.

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Section: Introductionmentioning

confidence: 99%

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

et al. 2023

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“…As an example, the sol–gel method allows incorporating Al from its hydrolyzed alkoxide, 20 and the inclusion of other heteroatoms such as Zr 21 or Hf 22 has found its application in high‐temperature materials for harsh environments. Introducing catalytic amounts of Ni, Fe, or Pt precursors has been used to modify the carbon phase microstructure by promoting the growth of carbon nanotubes, 23 carbon nanofibers, 24 and other different 1D carbon nanostructures 25–28 . The amorphous matrix can also be modified by using the same synthetic strategies.…”

Section: Introductionmentioning

confidence: 99%

“…Introducing catalytic amounts of Ni, Fe, or Pt precursors has been used to modify the carbon phase microstructure by promoting the growth of carbon nanotubes, 23 carbon nanofibers, 24 and other different 1D carbon nanostructures. [25][26][27][28] The amorphous matrix can also be modified by using the same synthetic strategies. Contrary to what happens by the introduction of transition metals, the atoms surrounding Si in the periodic table are the ones that will conform the ceramic matrix.…”

Section: Introductionmentioning

confidence: 99%

Defective structure of doped carbons obtained from preceramic polymers through Cl₂‐ and NH₃‐assisted thermolysis

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Rubio

et al. 2022

Int J Applied Ceramic Tech

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The processing parameters such as the heat treatment temperature, type of preceramic precursor, and post-synthesis treatments are key factors for the development the different microstructures in polymer-derived ceramics. Moreover, doping with different heteroatoms has increased the ability of the polymerderived ceramics to produce tunable nanostructures with a controlled pore size and distributions. A preceramic precursor containing P has been prepared from a commercial polysiloxane polymer and a phosphate alkoxide. It has been subjected to thermal treatments in N 2 , NH 3 , and Cl 2 atmospheres in different order sequences to create differentiated microstructures either in the ceramic matrix and the carbon phase. The structural, textural, and spectroscopic characterization revealed that the P atoms play a key role in the evolution of the microstructure during the thermal treatments. If the chlorination is carried out before the treatment in NH 3 , a silicophosphate matrix is formed and prevents from nitrogen incorporation into the free carbon phase. On contrary, if the NH 3 treatment is carried out before the chlorination, the carbon phase is predominantly modified by the incorporation of P atoms within the free carbon network.

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“…As both the free-carbon content and its type can vary, silicon-oxycarbide-based black glass can be a semiconductor or insulator, and the addition of carbon forms, for example, can make the material conductive [6]. Such properties make silicon oxycarbide a promising material for protective coatings [7,8], electrodes in batteries [9], fuel cells [10], catalysis [11,12], or in medicine [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Materials 2021, 14, x FOR PEER REVIEW 2 of 17 protective coatings [7,8], electrodes in batteries [9], fuel cells [10], catalysis [11,12], or in medicine [13,14]. The synthesis of silicon-oxycarbide-based black glass is impossible with standard powder methods.…”

Section: Introductionmentioning

confidence: 99%

Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors

et al. 2021

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It has been shown that bifunctional monomers (D units), which are used to increase the carbon content in silicon oxycarbide precursors, can form volatile oligomers, thus affecting the amount of carbon available during the transition into the final material in the annealing process. Additionally, an uneven distribution of carbon-rich mers may lead to the formation of a free-carbon phase, instead of the incorporation of carbon atoms into the silicon matrix. In this study, a novel two-step approach was utilized. Firstly, a macromonomer containing a number of structural units with precise structure was synthesized, which was later polycondensed into a ceramic precursor. Chlorodimethylsilane modified 2,4,6,8-tetramethylcyclotetrasiloxane was used as a silicon oxycarbide precursor monomer containing both T and D structural units (i.e., silicon atoms bonded to three and two oxygen atoms, respectively), with well-defined interconnections between structural units. Such a macromonomer prevents the formation of small siloxane rings, and has a very limited number of possible combinations of structural units neighboring each silicon atom. This, after investigation using IR, XRD, TG and elemental analysis, gave insight into the effect of “anchoring” silicon atoms bonded to two methyl groups, as well as the impact of their distribution in comparison to the materials obtained using simple monomers containing a single silicon atom (structural unit).

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Synthesis and characterization of Ce/SiOC nanocomposites through the polymer derived ceramic method and evaluation of their catalytic activity

Cited by 10 publications

References 55 publications

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

Defective structure of doped carbons obtained from preceramic polymers through Cl₂‐ and NH₃‐assisted thermolysis

Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors

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Synthesis and characterization of Ce/SiOC nanocomposites through the polymer derived ceramic method and evaluation of their catalytic activity

Cited by 10 publications

References 55 publications

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

Defective structure of doped carbons obtained from preceramic polymers through Cl2‐ and NH3‐assisted thermolysis

Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors

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Defective structure of doped carbons obtained from preceramic polymers through Cl₂‐ and NH₃‐assisted thermolysis