Titanium coated with high-performance nanocrystalline ruthenium oxide synthesized by the microwave-assisted sol–gel procedure

Šekularac, Gavrilo; Košević, Milica; Drvenica, Ivana; Dekanski, Aleksandar; Panić, Vladimir V.; Nikolić, Biljana

doi:10.1007/s10008-016-3343-z

Cited by 6 publications

(17 citation statements)

References 37 publications

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“…Both fraction peaks become wider in the PSD spectra of 4 successive DLS measurements, with a decrease in the intensity of the low-dp fraction and corresponding increase for the agglomerate fraction ( Figure 1, a1 and a2, respectively), which indicates high tendency of the particles to join and precipitate. [30] The first peak, initially located around 60 nm, evolves and finally resolves into two shoulders around 50 and 200 nm in last two DLS measurements (a1). The agglomerates had a stable dp around 5 µm, but of increasing intensity of the scattered light (a2), which indicates that number of agglomerates continuously increases.…”

Section: Particle Size Distribution (Psd) Of the Synthesized Tio2mentioning

confidence: 99%

TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications

Košević¹,

Šekularac²,

Živković³

et al. 2017

Croat. Chem. Acta

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TiO2 powder was synthesized by a forced hydrolysis process and used for the synthesis of Pt/TiO2 composite that is to be foreseen as an advanced electrode material. Pt was incorporated into the synthesized TiO2 from a Pt colloidal dispersion as a precursor prepared by a microwave-assisted polyol process. Physicochemical properties of TiO2 and TiO2-supported Pt were investigated by scanning electron microscopy, dynamic light scattering and X-ray spectroscopy and diffraction techniques. The properties of Pt/TiO2 composite are correlated to the basic voltammetric response of its thin-layer form. It was found that subsequent thermal treatment of synthesized TiO2, which caused crystallization into mainly rutile phase, is required for appropriate Pt incorporation. Although being appropriately loaded by Pt, and the voltammetric response is typical for Pt-based material, the voltammetry of Pt/TiO2 corresponded to much lower loadings. The possibility for Pt particles to be trapped inside TiO2 agglomerates is indicated. The catalyst usage from the synthesized Pt/TiO2 was found quite moderate due to this trapping.

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Section: Particle Size Distribution (Psd) Of the Synthesized Tio2mentioning

confidence: 99%

TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications

Košević¹,

Šekularac²,

Živković³

et al. 2017

Croat. Chem. Acta

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“…However, the stability of the particles from a fraction of smaller diameter appeared improved upon intensification of the temperature/pressure synthesis conditions. [37] DLS spectrum clearly indicates the two well resolved fractions of a particle size, around 90 and 270 nm. However, due to polydispersity, DLS spectrum can be resolved into several overlapping contributions of particle size fractions, as will be discussed later on.…”

Section: Resultsmentioning

confidence: 92%

“…There were no evidences of particles smaller than 50 nm existing alone in the suspension. However, the stability of the particles from a fraction of smaller diameter appeared improved upon intensification of the temperature/pressure synthesis conditions . DLS spectrum clearly indicates the two well resolved fractions of a particle size, around 90 and 270 nm.…”

Section: Resultsmentioning

confidence: 97%

“…Particle size distribution (PSD) analysis of synthesized oxide suspension has been previously done by dynamic light scattering (DLS) . PSD by particle volume ( V p ) for synthesized suspension has been found highly polydisperse, although within defined, rather broad, particle size range of 50–500 nm.…”

Section: Resultsmentioning

confidence: 99%

“…[35,36] Recently, the considerable improvement of the electrocatalytic activity of RuO 2 coatings on Ti were achieved by ex-situ synthesis of RuO 2 through controlled microwave-assisted hydrothermal procedure (MWHP). [37,38] The improved activity, both in coating capacitive performance and for oxygen evolution has been assigned to the generation of high-energy oxide surface states exclusively related to MWHP. Hence, MWHP-synthesized RuO 2 appeared worth of further investigation for supercapacitive applications.…”

Section: Introductionmentioning

confidence: 99%

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High Energy/Power Supercapacitor Performances of Intrinsically Ordered Ruthenium Oxide Prepared through Fast Hydrothermal Synthesis

et al. 2017

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A simple one‐step microwave‐assisted and temperature‐controlled hydrothermal synthesis was applied to prepare a nanocrystalline RuO2 dispersion from an aqueous solution of RuCl3 for supercapacitive applications. The obtained RuO2 dispersions were subjected to dynamic light scattering in order to analyze the particle size distribution, whereas morphology and structural properties of the solid phase were investigated by using AFM, SEM, EDX, TEM, and XRD techniques. Ellipsoidally shaped 100–500 nm‐sized compact grains, joined into highly ordered prismatic agglomerates, are observed. Two types of grains are observed: more regular ones consisting of spherical, amorphous particles of a few nanometers in size, and irregular ones made of partially crystalline 10–80 nm‐sized particles. Consequently, the most dominant structure is 250‐nm grains. The particles tend to join tightly across their crystalline domains, which appears responsible for the formation of prismatic shapes of several micrometers. This arraying causes high capacitive activity ‐ specific capacitances of up to 800 F g−1 are registered, which negligibly depend on the charging/discharging rate. The synthesized material is of highly accessible internal structure, and is an excellent candidate for both low‐ and high‐power applications.

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Sources of Oxygen Produced in the Chlorate Process Utilizing Dimensionally Stable Anode (DSA) Electrodes Doped by Sn and Sb

Lindberg

Díaz‐Morales

Holmin³

et al. 2021

Ind. Eng. Chem. Res.

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Identifying the sources of oxygen in the chlorate process is challenging due to the complex set of chemical and electrochemical reactions involved. Here, two types of electrodes have been investigatedTi0.7Ru0.3O x , and electrodes with aimed composition Ti0.34Ru0.3Sn0.3Sb0.06O x , both compared with platinum anodes. The cell oxygen off-gas was analyzed employing mass spectrometry together with ex situ UV–vis spectroscopy to quantify the kinetic rate constants. Noteworthy is that the respective rates of oxygen formation from anodic and chemical reactions in the presence of hypochlorite are of the same magnitude. The addition of Sn and Sb doubled the surface area of the electrodes and decreased oxygen production when electrodes were used for the first time. However, rate constants for total oxygen production with reused electrodes follow the trend: homogeneous hypochlorite decomposition < TiRu < TiRuSnSb to the highest value obtained by Pt. The same trend is noticed for rate constants concerning the hypochlorite decomposition.

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Titanium coated with high-performance nanocrystalline ruthenium oxide synthesized by the microwave-assisted sol–gel procedure

Cited by 6 publications

References 37 publications

TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications

TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications

High Energy/Power Supercapacitor Performances of Intrinsically Ordered Ruthenium Oxide Prepared through Fast Hydrothermal Synthesis

Sources of Oxygen Produced in the Chlorate Process Utilizing Dimensionally Stable Anode (DSA) Electrodes Doped by Sn and Sb

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