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Nanocomposites graphene/CoFe2O4 and graphene/NiFe2O4 – preparation and characterization

100%

Jędrzejewska A., Sibera D., Pełech R., Jędrzejewski R., Narkiewicz U.

Archives of Metallurgy and Materials

2019

vol. 64

issue 1

Effect of Synthesis Parameters of Graphene/Fe₂O₃ Nanocomposites on Their Structural and Electrical Conductivity Properties

100%

Jedrzejewska A., Sibera D., Narkiewicz U., Pełech R., Jedrzejewski R.

Acta Physica Polonica A

2017

vol. 132

issue 4

1424-1429

Due to its fascinating properties such as high surface area, very good electrical and thermal conductivity, excellent mechanical properties, optical and electrochemical properties, graphene may be the ideal material as a substrate of nanocomposites for applications in electronics. Graphene layer can be used as a conductive matrix allowing good contact between crystallites of nanomaterials. Despite pure graphene, its composites with other species can be of interest. In this paper the results of studies on the effect of methods and parameters of synthesis, for obtaining composites graphene/Fe₂O₃ on their structural properties and electrical properties are presented. A series of experiments was conducted using a commercially available graphene (Graphene Nanopowder AO-3) and iron nitrate. The materials were obtained using two pressure methods: pressure synthesis in the autoclave and synthesis in the microwave solvothermal reactor. The syntheses were carried out in a solution of ethanol. The specific surface area, helium density, morphology, phase composition, thermal properties and electric conductivity of the obtained composites were investigated.

Synthesis and characterization of Pt/CeOxsystems for catalytic CO oxidation reaction

86%

Wróbel R., łagonda S., Narkiewicz U., Pełech R., Becker S., Szymaszkiewicz L.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

2011

vol. 66

37-46

Four different ceria supported catalyst were prepared by impregnation method with Pt(NO3)2 solution. The two supports are commercially available (MaTeck) and the other two were prepared by precipitation and microwave assisted hydrothermal method (MAH) respectively. The phase composition and average crystallite size of the catalysts were characterised with XRD technique. Finally the catalytic activity in CO oxidation reaction were determined in plug flow reactor in temperature range 300-900 K with 1 K resolution. The catalysts obtained in both precipitation and MAH methods exhibit catalytic activity at room temperature whereas catalysts obtained on MaTeck supports are not active at those conditions. In turn, catalysts based on MaTeck support are more active in temperature range 420-700 K. The different activities are attributed to difference in average crystallite sizes and in support morphology.

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1 Acta Physica Polonica A

1 Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

1 Archives of Metallurgy and Materials

1 2019

1 2017

1 2011

3 Narkiewicz U.

3 Pełech R.

2 Sibera D.

1 Becker S.

1 Jedrzejewska A.

1 Jedrzejewski R.

1 Jędrzejewska A.

1 Jędrzejewski R.

1 Szymaszkiewicz L.

1 Wróbel R.

1 łagonda S.

Search results

Nanocomposites graphene/CoFe2O4 and graphene/NiFe2O4 – preparation and characterization

Effect of Synthesis Parameters of Graphene/Fe₂O₃ Nanocomposites on Their Structural and Electrical Conductivity Properties

Synthesis and characterization of Pt/CeOxsystems for catalytic CO oxidation reaction