Thermal expansion coefficient of carbon‐supported Pt nanoparticles: <i>In‐situ</i> X‐ray diffraction study

Leontyev, Igor N.; Kulbakov, Anton A.; Allix, Mathieu; Rakhmatullin, Aydar; Kuriganova, Alexandra B.; Маслова, О. А.; Smirnova, N. V.

doi:10.1002/pssb.201600695

Cited by 14 publications

(12 citation statements)

References 30 publications

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“…The average anatase crystallite size increased from 12–15 nm at 200 °C to 87 nm, 63 nm, 34 nm, 37 nm, and 47 nm for pure, Al-doped, In-doped, In–Cr co-doped, and Ag–Cr co-doped anatase nanopowder, respectively, at 800 °C. Therefore, an increase in crystallite size yields a decreasing TECs, like the TEC of carbon-supported Pt nanoparticles [ 42 ]. The conversion of amorphous material to crystalline anatase through atomic diffusion-controlled nucleation and growth results because of anatase crystallite growth with temperature and oxygen gas pressure behaviour.…”

Section: Resultsmentioning

confidence: 99%

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

Albetran

2020

Heliyon

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Synchrotron radiation diffraction was conducted in-situ and at high temperature to establish the lattice parameters of pure/undoped, doped, and co-doped anatase nanoparticles. The nanoparticles were heated from room temperature to 950 °C in sealed quartz capillaries. The effect of pressure, doping (aluminium or indium), and co-doping (indium-chromium or silver-chromium) on the thermal expansion coefficients of nanocrystalline anatase was established. Synchrotron radiation diffraction at high temperature and in-situ , transmission electron microscopy, and the Rietveld refinement method were used to characterise the anatase nanoparticles. The anisotropy of the thermal expansion, α a /α c , for pressurised anatase nanoparticles was smaller than that for anatase heated in unpressurised air or argon, and it was much smaller in a vacuum.

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Section: Resultsmentioning

confidence: 99%

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

Albetran

2020

Heliyon

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“…All XRD powder patterns were refined using the Rietveld method which enabled us to evaluate the average crystalline size D and parameter of the unit cell a. Since the β-form of nickel oxide has a space group Fm3m, the X-ray diffraction patterns were refined similarly to that described in the work [ 24 , 25 ]. The quality of X-ray refinement of NiO/C composite is shown in Figure S2 .…”

Section: Methodsmentioning

confidence: 99%

Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors

et al. 2021

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A series of NiO/C nanocomposites with NiO concentrations ranging from 10 to 90 wt% was synthesized using a simple and efficient two-step method based on non-isothermal decomposition of Nickel(II) bis(acetylacetonate). X-ray diffraction (XRD) measurements of these NiO/C nanocomposites demonstrate the presence of β-NiO. NiO/C nanocomposites are composed of spherical particles distributed over the carbon support surface. The average diameter of nickel oxide spheres increases with the NiO content and are estimated as 36, 50 and 205 nm for nanocomposites with 10, 50 and 80 wt% NiO concentrations, respectively. In turn, each NiO sphere contains several nickel oxide nanoparticles, whose average sizes are 7–8 nm. According to the tests performed using a three-electrode cell, specific capacitance (SC) of NiO/C nanocomposites increases from 200 to 400 F/g as the NiO content achieves a maximum of 60 wt% concentration, after which the SC decreases. The study of the NiO/C composite showing the highest SC in three- and two-electrode cells reveals that its SC remains almost unchanged while increasing the current density, and the sample demonstrates excellent cycling stability properties. Finally, NiO/C (60% NiO) composites are shown to be promising materials for charging quartz clocks with a power rating of 1.5 V (30 min).

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“…The calibration of the setup, the data processing, the Rietveld refinement and other manipulations were implemented in accordance with the technique described in ref. . A Pt(acac) 2 sample was placed into a glass tube capillary with a diameter of 1 mm, purged with argon during the synthesis.…”

Section: Methodsmentioning

confidence: 99%

In Situ Investigation of Non‐Isothermal Decomposition of Pt Acetylacetonate as One‐Step Size‐Controlled Synthesis of Pt Nanoparticles

Kulbakov

Allix

Rakhmatullin

et al. 2018

Physica Status Solidi (a)

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Interest in the development of state-of-the-art methods for synthesis of Pt nanoparticles is dictated by both unique properties of platinum itself and the wide range of platinum nanoparticles applications. Platinum acetylacetonate and platinum nanoparticles produced by the thermal decomposition of Pt(acac) 2 are studied via in situ X-ray diffraction and Raman spectroscopy, thermal gravimetry, scanning (SEM), and transmission electronic microscopy (TEM). The experiments are made at heating rates of 1 and 5 K min À1 . A comparative analysis of SEM, TEM, and XRD data highlights the formation of coarse Pt particles with sizes of %60-160 nm, which are composed of nanoparticles with dimensions of 1.9 and 4.1 nm for 1 K min À1 -and 5 K min À1 -heating rates, respectively. The desirable average size of nanoparticles upon their synthesis can thus be achieved by a simple tuning of the heating rate of acetylacetate thermal decomposition. The present results open up the possibility to use a trivial non-isothermal thermal decomposition method in the synthesis of both supported and unsupported nanoparticles of predetermined size for other chemical elements such as Pd, Ni, Co, etc. from their acetylacetonates.

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Thermal expansion coefficient of carbon‐supported Pt nanoparticles: In‐situ X‐ray diffraction study

Cited by 14 publications

References 30 publications

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors

In Situ Investigation of Non‐Isothermal Decomposition of Pt Acetylacetonate as One‐Step Size‐Controlled Synthesis of Pt Nanoparticles

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