A Novel Approach for the Processing of Advanced Polymer Derived Ceramics with Carbon Nanotubes with the Help of Pores

Mantzel, Niko; Rannabauer, Stefan; Bucharsky, Ethel C.; Schell, Karl G.; Hoffmann, Michael J.; Scheffler, Michael

doi:10.1002/adem.201300081

Cited by 5 publications

(11 citation statements)

References 18 publications

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“…Furthermore, CNTs were synthesized from a borazine-based precursor including nickel catalyst 5 [24] andYa-Li Li reported the fabrication of SiOC-CNTs composite by a one-step process via the in situ growth of CNTs during the pyrolysis of a preceramic polymer (polysiloxane) including FeCl 3 as catalyst [25]. Recently, Mantzel et al [26] took one step further to not only in situ form CNTs in pyrolyzed Si-O-C samples but also sinter/densify the ceramic body by field assisted sintering technology, and their results showed that CNTs could survive the harsh sintering conditions and significantly improve the mechanical properties, e.g., hardness, for the samples sintered at 1050ºC when compared with CNT-free ones.…”

Section: Introductionmentioning

confidence: 99%

An optimized process for in situ formation of multi-walled carbon nanotubes in templated pores of polymer-derived silicon oxycarbide

Peng

Wang

et al. 2017

Ceramics International

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A reliable and optimized process to grow carbon nanotubes (CNTs) in templated pores of polymer derived ceramic (PDC) matrixwas developed. It is realized through the pyrolysis of a preceramic polymer,i.e., poly (methyl-phenyl-silsesquioxane) (denoted as PMPS), in argon atmosphere at 1000°Ctogether with nickel-catalyst-coatedpoly-methyl-methacrylate (PMMA) microbeads (denoted as PMMA-Ni). PMPS served as both a precursor for the ceramic matrix and a carbon source for the CNT growth. PMMA microbeads were used as sacrificial pore formers and coated with nickel via an electroless plating method, which provides much betteran improved control of particle size of the catalyst and its distribution in the material. The influence of PMMA-Ni loading on the in situ growth of CNTs and the properties of CNTs/SiOCnanocomposites were studied through thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and density/porosity measurements. Under optimized conditions, uniform distribution of in situ grown CNTs was observed within the templated pores of the SiOC matrix.The optimized process leads to reproducible high yield of CNTs in the pores.The development of such novelCNT/cellular ceramicnanocomposite materials is of significant interest for a variety of sensor applications.

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Section: Introductionmentioning

confidence: 99%

An optimized process for in situ formation of multi-walled carbon nanotubes in templated pores of polymer-derived silicon oxycarbide

Peng

Wang

et al. 2017

Ceramics International

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“…These tentative hypotheses have been deduced from previous studies of Ni/Co-containing PDC materials. 15,16,50,51 It is believed that further studies are necessary to explain the role of Overall, the surface morphology analysis confirms that with the existence of pores in PDC the addition of Ni and Co was beneficial for an in situ growth of CNTs. Moreover, the thermal stability of the metal-containing ceramics is slightly better than that of bare H.A as a result of in situ grown CNT, which improves the overall thermal stability of the ceramic composite (Figure S4).…”

Section: ■ Results and Discussionmentioning

confidence: 65%

“…It is already reported that in catalystassisted pyrolysis the in situ growth of CNT is possible in porous PDC, with the help of a metal catalyst. 15,16,43,49 The S7). However, in the case of bare H.A, the formation of CNTs at both temperatures cannot be observed (Figure 2a,b, Figure S7).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…These possible mechanisms for the formation of CNTs in metal-containing PDC have been presumed from similar material described in various literature. 15,16,50,51 Moreover, the reaction starting at gas phase promotes the in situ growth of CNTs, whereas that in the solid matrix results in turbostratic carbon. 43 The grown CNTs show at least 13−15 layers (MWCNTs) with inner and outer diameters of 10−15 and 30−60 nm, respectively, with a length of a few micrometers (Figures 2−4).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Metal-Containing Ceramic Composite with in Situ Grown Carbon Nanotube as a Cathode Catalyst for Anion Exchange Membrane Fuel Cell and Rechargeable Zinc–Air Battery

Prabu

Pollachini

Wilhelm

et al. 2019

ACS Appl. Energy Mater.

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The development of new air-breathing cathode catalyst not only addresses the performance of fuel cells and metal−air batteries but also make them cheaper. Herein, we developed a new, metal containing (Ni, Co, Pt and their alloys) ceramic composite as a cathode electrocatalyst for anion exchange membrane fuel cell (AEMFC) and zinc−air battery (ZAB) application. The porous ceramic foams were generated with the help of a sacrificial template method in which polystyrene beads were infiltrated with a polysiloxane precursor. With addition of metal salts into the porous ceramic matrix, the formation of carbon nanotubes (CNTs) by applying catalyst-assisted pyrolysis was facilitated. The in situ grown CNTs in composite ceramic affect the charge transport and drastically improved the electrical conductivity of up to 6 orders in magnitude compared with the bare ceramics (H.A). The best performing Ni-containing ceramics (H.A.Ni) show improved oxygen reduction activity in half-cell measurements and for AEMFC delivered an open-circuit voltage of 0.65 V with a maximum power density of ∼10 mW cm −2 . In rechargeable ZAB systems, the H.A.Ni showed excellent battery performance with a specific capacitance of 490 mAh g −1 , maximum power density of 110 mW cm −2 , and excellent discharge/charge cycle stability over 300 cycles. Results indicate that the presence of CNT and intermetallic silicides such as Ni 2 Si and Ni 31 Si 12 tunes the electrical properties and enhances the electrocatalytic activity toward oxygen. Thus, the Ni-containing ceramic material is as an excellent cathode catalyst for AEMFC and rechargeable ZAB applications.

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“…The crystallization of both phases increase with temperature. Mantzel et al 28) found that above 1000°C the metastable matrix of SiOC transforms to stable SiO 2 and SiC, which was detected within their XRD spectra. XRD spectra of the SiOC/MoSi 2 composites after annealing at high temperatures are depicted in Fig.…”

Section: Ageing At Elevated Temperatures and Electrical Resistivitymentioning

confidence: 91%

Precursor derived SiOC/MoSi<sub>2</sub>-composites for diesel glow plugs: preparation and high temperature properties

Reitz

Schell

Bucharsky

et al. 2016

J. Ceram. Soc. Japan

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In this study precursor derived SiOC/MoSi 2 composites were evaluated with respect to their potential for the application as glow plug material. In a first step, fully dense composite materials with different fractions of electrical conductive MoSi 2 were fabricated by field-assisted sintering technique (FAST). The percolation threshold, where the electrical properties change from insulating to a suitable level of conduction depends on the microstructure, which can be controlled by the initial particle size of the used SiOC particles. It becomes principally possible to fabricate both, the insulating part and the heater material with the same MoSi 2 content and therefore without thermal mismatch. Room temperature properties, high temperature strength, oxidation and creep behaviour depend strongly on the MoSi 2 volume fraction. MoSi 2 contents beyond the percolation threshold lead to significantly enhanced creep rates. At high temperatures, reactions between SiOC and MoSi 2 can be observed, which differ at the air exposed surface and in the interior of the samples. From these findings, an upper limit for the application temperature can be derived.

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A Novel Approach for the Processing of Advanced Polymer Derived Ceramics with Carbon Nanotubes with the Help of Pores

Cited by 5 publications

References 18 publications

An optimized process for in situ formation of multi-walled carbon nanotubes in templated pores of polymer-derived silicon oxycarbide

An optimized process for in situ formation of multi-walled carbon nanotubes in templated pores of polymer-derived silicon oxycarbide

Metal-Containing Ceramic Composite with in Situ Grown Carbon Nanotube as a Cathode Catalyst for Anion Exchange Membrane Fuel Cell and Rechargeable Zinc–Air Battery

Precursor derived SiOC/MoSi<sub>2</sub>-composites for diesel glow plugs: preparation and high temperature properties

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