Magnetoresistance of nanocarbon structure modified by NiFe DOI Creative Commons

Dmytro Zaiats,

Denys Shpylka, I. V. Ovsiienko

et al.

Bulletin of Taras Shevchenko National University of Kyiv Series Physics and Mathematics, Journal Year: 2024, Volume and Issue: 2, P. 89 - 95

Published: Jan. 1, 2024

The paper presents the results of studies magneto-transport properties nanocarbon structures modified on surface at same time with particles transition metals nickel and iron. Two different types were chosen as starting materials for modification. These are graphite nanoplates lateral particle sizes up to 10 μm, obtained by sonication thermally exfoliated during several hours in acetone, multi-walled carbon nanotubes a diameter 40 nm. modification was carried out method metal reduction from an aqueous solution nitrate, which permeated corresponding particles. As result modification, uniform distribution obtained. total mass concentration 60%. Studies structural phase composition revealed that there not individual granules iron, but FeNi3 alloy To measure resistance magnetic field, bulk samples nanoplatelets multiwalled powders produced form rectangular parallelepipeds cold pressing using polyvinyl acetate (25% mass) binder. Measurements magnetoresistance standard four-probe temperatures 293 K 77 transverse longitudinal orientation sample relative external field. Conducted experimental layered structures, main contribution is made anisotropic magnetoresistance, characteristic metals, linear occurs systems zero-band gap quasi-linear dispersion law. For nanotubes, determined mainly spin-orbital interaction charge carriers moments atoms modifier alloy.

Language: Английский

Deep Eutectic Solvent for Facile Synthesis of Mn3O4@N-Doped Carbon for Aqueous Multivalent-Based Supercapacitors: New Concept for Increasing Capacitance and Operating Voltage DOI Open Access
Nikola Zdolšek, Ivana Perović, Snežana Brković

et al.

Materials, Journal Year: 2022, Volume and Issue: 15(23), P. 8540 - 8540

Published: Nov. 30, 2022

The capacitance and operating voltage of supercapacitors as well their energy density have been increased by development different materials electrolytes. In this paper, two strategies, for the first time, were used to improve density: Mn3O4- N-dual doped carbon electrode aqueous mixture multivalent ions electrolyte. was prepared a novel cost-effective procedure using deep eutectic solvent. XRD, XPS, FTIR confirmed presence Mn3O4 nitrogen, while SEM EDS elemental mapping showed micrometer-sized nanosheets with uniform distribution C, O, N, Mn atoms. Charge storage behavior tested in multivalent-based electrolytes (Ca2+-Al3+). Regarding both specific workable voltage, Ca2+-Al3+ mixed electrolyte found best optimal solution. calcium addition Al-electrolyte allows higher than case individual Al(NO3)3 Al3+ ion Ca(NO3)2 improves multivalent-ion charge ability carbon. As result, two-electrode Mn3O4@N-doped carbon//Al(NO3)2+Ca(NO3)2//Mn3O4@N-doped supercapacitor (34 Wh kg-1 at 0.1 A g-1) overpasses reported values obtained Mn-based conventional

Language: Английский

Citations

9
From hydroxyl group to carbonyl group: Tuning the supercapacitive performance of holey graphene DOI
Maodan Xu, Xixin Wang, Ziqing Li

et al.

Electrochimica Acta, Journal Year: 2023, Volume and Issue: 473, P. 143491 - 143491

Published: Nov. 11, 2023

Language: Английский

Citations

5
Facile synthesis, structural, morphological and electronic investigation of Mn2O3 nano-rice shape and Mn2O3-rGO hybrid nanocomposite DOI
Hanan Elhaes,

Ahmed I. Abdel-Salam,

Islam Gomaa

et al.

Optical and Quantum Electronics, Journal Year: 2023, Volume and Issue: 55(11)

Published: Aug. 18, 2023

Language: Английский

Citations

4
Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors DOI Creative Commons

Jinqiao Zhang,

Meiling Cen,

Tao Wei

et al.

Nanomaterials, Journal Year: 2023, Volume and Issue: 13(22), P. 2927 - 2927

Published: Nov. 10, 2023

Supercapacitors (SCs) are widely used in energy storage devices due to their superior power density and long cycle lifetime. However, the limited densities of SCs hinder industrial application a great extent. In this study, we present new combination metallic phosphide-carbon composites, synthesized by directly carbonizing (Ni1-xCox)5TiO7 nanowires via thermal chemical vapor deposition (TCVD) technology. The method uses one-dimensional (1D) (Ni1-xCox)TiO7 as precursors supporters for situ growth intertwined porous CNF microspheres. These 1D undergo microstructure transformation, resulting formation CoNiP nanoparticles, which act excellent interconnected catalytic nanoparticles 3D Benefiting from synergistic effect unique 1D/3D structure, agglomeration can effectively be prevented. microspheres exhibit an conductive matrix provide large specific surface area with abundant ion/charge transport channels. Consequently, at scanning rate 10 mV s-1, its capacitance 1.0 M Na2SO4 + 0.05 Fe(CN)63-/4- aqueous solution is high 311.7 mF cm-2. Furthermore, CoNiP@CNFs composite film-based symmetrical show ultrahigh 20.08 Wh kg-1 7.20 kW kg-1, along outstanding cycling stability, 87.2% capacity retention after 10,000 cycles soluble redox electrolytes. This work provides strategy designing applying high-performance binary transition metal phosphide/carbon composites next-generation devices.

Language: Английский

Citations

4
Enhanced electrochemical behavior of naturally derived Eu3+: PEG/CaCO3 nanocomposite for supercapacitor application DOI Open Access
Vimala Ramasamy,

E. Thenpandiyan,

G. Suresh

et al.

Inorganic Chemistry Communications, Journal Year: 2023, Volume and Issue: 159, P. 111758 - 111758

Published: Nov. 20, 2023

Language: Английский

Citations

3
Tsuchime-like Aluminum Film to Enhance Absorption in Ultra-Thin Photovoltaic Cells DOI Creative Commons
Mikita Marus, Yauhen Mukha,

Him-Ting Wong

et al.

Nanomaterials, Journal Year: 2023, Volume and Issue: 13(19), P. 2650 - 2650

Published: Sept. 26, 2023

Ultra-thin solar cells enable materials to be saved, reduce deposition time, and promote carrier collection from with short diffusion lengths. However, light absorption efficiency in ultra-thin panels remains a limiting factor. Most methods increase are either technically challenging or costly, given the thinness of functional layers involved. We propose cost-efficient lithography-free solution enhance cells-a Tsuchime-like self-forming nanocrater (T-NC) aluminum (Al) film. T-NC Al film can produced by electrochemical anodization Al, followed etching nanoporous alumina. Theoretical studies show that average absorbance 80.3%, depending on active layer's thickness. The wavelength range increased varies layer thickness, peak absolute moving 620 nm 950 as thickness increases 500 10 µm. have also shown is retained regardless material. Therefore, significantly boosts without requiring expensive lithography,

Language: Английский

Citations

2
Applications of Graphene Nanoplatelets as Working Fluids in Photovoltaic Thermal Systems: A Review DOI Creative Commons

Nurul Izzati Akmal Muhamed Rafaizul,

Mohd Afzanizam Mohd Rosli,

Nurfarhana Salimen

et al.

International Journal of Nanoelectronics and Materials (IJNeaM), Journal Year: 2024, Volume and Issue: 17(3), P. 343 - 353

Published: Aug. 13, 2024

The application of nanofluids, specifically graphene nanoplatelets, as a working fluid in photovoltaic thermal (PV/T) has attracted much attention due to the enhanced thermophysical properties nanofluids compared those conventional fluids. In comparison traditional fluids, nanofluid is potential heat transfer that can significantly improve system efficiency. nanoparticle's large surface area and small size result an increased rate transmission. This review addressed use nanoplatelets (GNP) PV/T systems. Incorporating GNP into systems attain many advantages, including conductivity energy conversion goes through difficulties synthesizing characterizing GNP. addition, highlights experimentation on performance terms their fluid. integration holds immense promise for enhancing efficiency rates. demonstrated benefits GNP, its superior transmission efficiency, underscore key component advancing technology. reviews concluded composition 0.5 wt.% with ratio 1:1 surfactant shows best formulation achieve good dispersion nanofluid.

Language: Английский

Citations

0
Applications of Energy Storage Materials as Supercapacitors DOI
S. Girija, J. Wilson

ACS symposium series, Journal Year: 2024, Volume and Issue: unknown, P. 343 - 371

Published: Nov. 4, 2024

The development of nanomaterials, such as nanostructured carbons, metal oxides, and conducting polymers, has revolutionized energy device fabrication. Due to its large capacity for storing energy, lengthy cycle life, high power density, minimal maintenance requirements, supercapacitors (SCs) are used extensively. SCs also offer potential solutions efficient storage, with electric double layer at the electrode-electrolyte interface pseudocapacitive mechanisms using various materials. This chapter reviews materials in electrochemical capacitor electrode fabrication, including double-layer capacitors, pseudocapacitors, hybrid capacitors provides an overview SCs' mechanisms, comparing studies determine capacitance cyclability Materials include graphene, graphene nanocomposites, activated transition dichalcogenides considered influence electrolyte examined increase specific capacitance. And a perspective on next-generation technology, challenges it faces, strategies constructive suggestions proposed solve existing problems.

Language: Английский

Citations

0
Magnetoresistance of nanocarbon structure modified by NiFe DOI Creative Commons

Dmytro Zaiats,

Denys Shpylka, I. V. Ovsiienko

et al.

Bulletin of Taras Shevchenko National University of Kyiv Series Physics and Mathematics, Journal Year: 2024, Volume and Issue: 2, P. 89 - 95

Published: Jan. 1, 2024

The paper presents the results of studies magneto-transport properties nanocarbon structures modified on surface at same time with particles transition metals nickel and iron. Two different types were chosen as starting materials for modification. These are graphite nanoplates lateral particle sizes up to 10 μm, obtained by sonication thermally exfoliated during several hours in acetone, multi-walled carbon nanotubes a diameter 40 nm. modification was carried out method metal reduction from an aqueous solution nitrate, which permeated corresponding particles. As result modification, uniform distribution obtained. total mass concentration 60%. Studies structural phase composition revealed that there not individual granules iron, but FeNi3 alloy To measure resistance magnetic field, bulk samples nanoplatelets multiwalled powders produced form rectangular parallelepipeds cold pressing using polyvinyl acetate (25% mass) binder. Measurements magnetoresistance standard four-probe temperatures 293 K 77 transverse longitudinal orientation sample relative external field. Conducted experimental layered structures, main contribution is made anisotropic magnetoresistance, characteristic metals, linear occurs systems zero-band gap quasi-linear dispersion law. For nanotubes, determined mainly spin-orbital interaction charge carriers moments atoms modifier alloy.

Language: Английский

Citations

0