Synthesis and structural characterization of hybrid polymeric networks-derived-SiCxOy in the presence and absence of cobalt acetate

Pereira, Jaqueline Laís; Godoy, Naiara Vieira; Ribeiro, Emerson Schwingel; Segatelli, Mariana Gava

doi:10.1016/j.jaap.2015.05.015

Cited by 9 publications

(15 citation statements)

References 55 publications

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“…This result was in accordance with the XPS elemental composition analysis data results shown in Table S2 (Supporting Information) with a carbon and nitrogen content of 56.51 wt % and 3.12 wt % in Co/SiOC and 61.74 wt % and 2.56 wt % in Ni/SiOC. The higher amount of graphitic carbon is possibly due to the catalytic activity of cobalt and nickel in promoting the growth of carbon structures …”

Section: Resultsmentioning

confidence: 99%

“…[12][13][14][15][16] Silicon-oxy-carbide (SiOC) structures synthesized from polysiloxane polymers suitably cross-linked and pyrolysed at elevated temperature are relevant PDC structure with unique two-phase structure such as (i) the amorphous phase where Si is tetrahedrally bonded with oxygen and carbon; (ii) disordered carbon phase holding excellent chemical, thermal and physical properties that can be employed as bifunctional catalyst. [13,[17][18][19][20] The addition of precursor for transition metal particles such as cobalt and nickel at the atomic level is crucial in enhancing the properties such as electrochemical activity and conductivity of the SiOC material. [12,13,15,17,19] These metals (Ni and Co) are widely utilized because of their low cost, abundance and promising properties with higher conductivity, electrochemical activity, and durability in alkaline medium.…”

Section: Introductionmentioning

confidence: 99%

“…[13,[17][18][19][20] The addition of precursor for transition metal particles such as cobalt and nickel at the atomic level is crucial in enhancing the properties such as electrochemical activity and conductivity of the SiOC material. [12,13,15,17,19] These metals (Ni and Co) are widely utilized because of their low cost, abundance and promising properties with higher conductivity, electrochemical activity, and durability in alkaline medium. [13,21,22] PDC is acquainted in various fields like Li-ion battery, drug delivery, defence and aerospace applications.…”

Section: Introductionmentioning

confidence: 99%

“…[12,13,15,17,19] These metals (Ni and Co) are widely utilized because of their low cost, abundance and promising properties with higher conductivity, electrochemical activity, and durability in alkaline medium. [13,21,22] PDC is acquainted in various fields like Li-ion battery, drug delivery, defence and aerospace applications. [12,13,20] Recently, David et al synthesized silicon oxycarbide glass -graphene composite through thermolysis of cross-linked 1,3,5,7-tetramethyl-1,3,5-tetravinylcyclotetrasiloxane (TTCS) and graphene oxide at 1000°C for Li-ion battery application exhibiting long-term cycling and higher reversible capacities.…”

Section: Introductionmentioning

confidence: 99%

“…[13,21,22] PDC is acquainted in various fields like Li-ion battery, drug delivery, defence and aerospace applications. [12,13,20] Recently, David et al synthesized silicon oxycarbide glass -graphene composite through thermolysis of cross-linked 1,3,5,7-tetramethyl-1,3,5-tetravinylcyclotetrasiloxane (TTCS) and graphene oxide at 1000°C for Li-ion battery application exhibiting long-term cycling and higher reversible capacities. [23] He also synthesized free-standing SiOC -graphene composite papers prepared by blending of GO and polysiloxanes as suitable Li-ion battery and Supercapacitors electrode.…”

Section: Introductionmentioning

confidence: 99%

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Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

et al. 2019

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The current hindrance in the commercialization of electrochemical devices such as fuel cells and metal–air batteries is the high cost and poor stability of widely employed noble‐metal‐based electrocatalysts. In this report, a new intermetallic nickel/cobalt silicide‐decorated carbon‐rich silica‐based ceramic composites (Co/SiOC or Ni/SiOC) were successfully synthesized as alternative bifunctional electrocatalysts. The oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) kinetics of the prepared composite materials were evaluated by electrochemical characterization. Co/SiOC exhibited more positive ORR kinetics with the onset potential of 0.87 V vs. RHE compared to that of Ni/SiOC, which is slightly lower compared to Pt/C. Conversely, Ni/SiOC exhibits a 50 mV more positive OER onset potential compared to Co/SiOC with almost similar OER kinetics to RuO2. The bifunctional ability concluded that Ni/SiOC was a good bifunctional catalyst with an oxygen electrode potential 0.89 V. As Co/SiOC performs as a better ORR catalyst, it was utilized as a cathode catalyst for the construction of anion exchange membrane fuel cell and its fuel cell performance was evaluated. The Co/SiOC composites produce a peak power density of 54 mW/cm2, representing a satisfactory result when compared with Pt/C. The results reveal that the intermetallic nickel/cobalt silicide nanosphere decorated ceramic materials can have a promising future as efficient alternative electrocatalysts in electrochemical devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

et al. 2019

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Characterization of a novel silicon‐containing hybrid polymer by thermal curing, pyrolysis behavior, and fluorescence analysis

Chen

Liu

Lin

et al. 2019

J of Applied Polymer Sci

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A novel linear silicon‐containing hybrid polymer with C  C and SiH linkages, diphenyl‐dihydroethynyl‐silane (DPHES), had been conveniently synthesized and well characterized. The thermal curing, crosslinked structure and pyrolysis behavior were studied by DSC, Fourier transform infrared (FTIR), and Pyrolysis‐gas chromatography/mass spectrometry (Py‐GC/MS). The results suggest the crosslinked structures consist mainly of phenyl and aromatic fused rings, which are formed through cyclotrimerization, addition reaction, and hydrosilylation reaction. The thermal properties indicate that the crosslinked DPHES exhibits excellent thermal stability with the temperature at 5% weight loss are higher than 572 and 509 °C under nitrogen and air atmosphere, respectively. The fluorescence emission spectra show DPHES and its crosslinked product also have moderate fluorescence properties, emitting purple light, and visible blue light, respectively, which further verified the structure of DPHES. These results suggest that DPHES has the potential to be used as light‐emitting materials with excellent thermal properties. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47403.

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The Influence of the Pyrolysis Temperature on the Material Properties of Cobalt and Nickel Containing Precursor Derived Ceramics and their Catalytic Use for CO2 Methanation and Fischer–Tropsch Synthesis

et al. 2016

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Ni and Co containing precursor derived ceramics (ceramers) were prepared from a polysiloxane based preparation route. All catalysts were characterised by BET, XRD and TEM as well as water and heptane adsorption and tested for CO2-methanation and Fischer-Tropsch synthesis. Different pyrolysis temperature between 400 and 600 °C were used to get catalysts with different surface hydrophilicities. With increasing synthesis temperature less organic groups remain on the surface resulting in a more hydrophilic catalyst. For all Ni containing ceramers, well dispersed particles in the range of 3 nm were formed with comparable surface areas. The catalysts with the lowest tendency towards water adsorption showed the highest activity for CO2-methanation. From the cobalt containing synthesis route, different material properties were observed. In contrast to the Ni catalysts, the Co particle formation depends on the pyrolysis temperature. While no metallic particles were formed above 400 °C, smallest particles were obtained using a pyrolysis temperature of 500 °C with particle sizes in the range of ~5 nm. With increasing pyrolysis temperature to 600 °C, particle size increases to ~10 nm. Nevertheless, first tests for CO2-methantion and Fischer-Tropsch reaction were successful and the catalysts with less hydrophilic surface showed higher activity and a higher selectivity towards C5+-products.

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Synthesis and structural characterization of hybrid polymeric networks-derived-SiCxOy in the presence and absence of cobalt acetate

Cited by 9 publications

References 55 publications

Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

Metal Silicide Nanosphere Decorated Carbon‐Rich Polymer‐Derived Ceramics: Bifunctional Electrocatalysts towards Oxygen and their Application in Anion Exchange Membrane Fuel Cells

Characterization of a novel silicon‐containing hybrid polymer by thermal curing, pyrolysis behavior, and fluorescence analysis

The Influence of the Pyrolysis Temperature on the Material Properties of Cobalt and Nickel Containing Precursor Derived Ceramics and their Catalytic Use for CO2 Methanation and Fischer–Tropsch Synthesis

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