A. G. Dyachenko

Intrinsic electrocatalytic activity combined with oxygen preconcentration at non-metalated hypercrosslinked polymers for selective oxygen reduction reaction

Shumaila Razzaque, Katarzyna Dorota Wielondek, A. G. Dyachenko, Kostyantyn Nikiforow et autres

flux promoter. Moreover, the calculations indicate that the presence of nitrogen-containing TPA units enhances the oxygen reduction rate as compared to TPB. This study paves the way for exploration of other non-metalated HCPs prepared from a wide array of precursors for ORR …

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NiFe and CoFe nanocomposites based on ternary oxide (Al 2 O 3 -SiO 2 -TiO 2 ) for CO 2 conversion into hydrocarbons

Olha V. Pryhunova, A. G. Dyachenko, M.V. Borysenko, Olena Goncharuk et autres

The composites based on ternary oxide Al2O3-SiO2-TiO2 (AST1), decorated with nanoparticles of nickel, cobalt, and iron oxides, were prepared by the solvate-stimulation method from nitrate and formate solutions with subsequent homogenization, calcination, and hydrogen reduction. The study of the CO2 conversion over …

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Microwave properties of composites based on glass microsphers coated with ferromagnetic compounds

Л. Л. Вовченко, O. S. Yakovenko, O. V. Turkov, O. V. Zhuravkov et autres

In this study, glass microspheres (GMs) of varying sizes, both pure and decorated with nano-sized bimetallic Ni(80)Fe(20) particles, were incorporated into epoxy-based composites filled with 3 wt% graphite nanoparticles (GNPs) to create 2D and 3D structures. The electromagnetic interference (EMI) shielding properties …

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Electrocatalytic oxygen reduction at non-metalated and pyrolysis free hypercrosslinked polymers

Shumaila Razzaque, A. G. Dyachenko, Aimen Waqar, Katarzyna Dusiło et autres

Oxygen reduction is one of the core steps of non-emissive zero carbon energy conversion. Therefore, enhancement of its sluggish kinetics is extremely important. Very recently researchers focused on oxygen electrocatalysis at porous polymers. Here we applied the non-metalated and pyrolysis free hypercrosslinked …

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Bimetallic NiFe nanoparticles deposited on hollow glass microspheres (HGMs) of various sizes for the catalytic hydrogenation of CO 2

Olha V. Pryhunova, A. G. Dyachenko, Olena V. Ischenko, Sofiia S. Lepeskina et autres

The composites based on hollow glass microspheres (HGMs) decorated with nanoparticles of nickel and iron oxides were prepared from the nitrate solutions with ultrasound treatment. Further exposition of these composites in a hydrogen-helium flow leads to the formation of nanosized bimetallic particles …

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Advanced design of sol-gel derived multilayered cerium titanate films: structural, surface, photoelectrochemical and photocatalytic properties

Anastasiia Kramar, Yuliia Bibik, A. G. Dyachenko, Olga Chernyayeva et autres

Crystallization of Ce2Ti2O7 in the mixture of TiO2 and CeO2 was achieved by the three-layered coating of cerium − titanium mixed sol of the 1 : 1 metals molar ratio on a glass substrate at certain temperature regime in air as proven …

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NiFe and CoFe nanocatalysts supported on highly dispersed alumina-silica: Structure, surface properties, and performance in CO2 methanation

A. G. Dyachenko, Olena V. Ischenko, Olha V. Pryhunova, Snizhana V. Gaidai et autres

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Co–Fe–oxide nanoparticles supported on the various highly dispersed matrices: the effect of the carrier on structural and magnetic properties

A. G. Dyachenko, Konrad Terpiłowski, Olena V. Ischenko, Iryna Sulym et autres

Abstracts A series of mixed oxides was synthesized by deposition of the guest phase on the highly dispersed oxide matrix. Fumed nanooxides SiO2, Al2O3, SiO2/Al2O3, and SiO2/Al2O3/TiO2 with the specific surface area of 65–91 m2/g were selected as highly dispersed matrices. Co–Fe …

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NiFe(CoFe)/silica and NiFe(CoFe)/alumina nanocomposites for the catalytic hydrogenation of CO2

Olha V. Pryhunova, A. G. Dyachenko, Olena V. Ischenko, Vitaliy Diuyk et autres

Abstract The fumed SiO2 and Al2O3 oxides with a specific surface area of about 80 m2 g–1 were used for the synthesis of Ni(80)Fe(20)/SiO2, Co(93)Fe(7)/SiO2, Ni(80)Fe(20)/Al2O3 and Co(93)Fe(7)/Al2O3 nanocomposites, and numbers between brackets indicate the metal content in wt%, being 10 wt% …

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CO2 Hydrogenation Over Bulk and Loaded NiFe Catalysts: The Effect of Carrier

A. G. Dyachenko, Olena V. Ischenko, Vitaliy E. Diyuk, S. V. Gaidai et autres

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Structure and magnetic properties of MWCNTs decorated by NiFe, CoFe, NiCo nanoparticles

L. Yu. Matzui, Л. Л. Вовченко, O. A. Syvolozhskyi, O. S. Yakovenko et autres

The method of salt impregnation was applied to grow magnetic alloy nanoparticles (Ni20Fe80, Co93Fe07 or Ni20Co80) on multi-walled carbon nanotubes (MWCNTs). It was confirmed by SEM and XRD that the method gives nanopowders where the metal component is in the form of …

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Epoxy composites filled with graphite nanoplatelets modified by FeNi nanoparticles: Structure and microwave properties

O. S. Yakovenko, L. Yu. Matzui, O. A. Syvolozhskyi, Л. Л. Вовченко et autres

This paper is concerned with investigation of the structure and microwave properties of epoxy resin composites with graphite nanoplatelets (GNPs) decorated by FeNi nanoparticles prepared by the salt impregnation. It was confirmed by SEM and XRD that the method gives nanopowder where …

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