Effect of Fe2O3 content on the electrical resistivity of aluminous porcelain applied to electrical insulators

Piva, D.H.; Piva, Roger Honorato; Venturini, Janio; Ramón, José; Caldas, V.; Morelli, M. R.; Bergmann, Carlos Pérez

doi:10.1016/j.ceramint.2015.12.016

Cited by 23 publications

(9 citation statements)

References 32 publications

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“…The simulated EIS radius of TiO2 was much larger than those of Fe2O3/TiO2s, illustrating that the decoration of Fe2O3 greatly reduced the interface charge transfer resistance between the electrode and electrolyte, which was probably attributed to the lower electronic resistivity of Fe2O3 (Chang et al, 2014). Moreover, the simulated EIS decreased with the content of surface Fe2O3, probably owing to an increase in tiny crystals within the Fe2O3, which could significantly reduce the electronic resistivity, although the XRD results did not discern the α-or γ-Fe2O3 crystalline phase (Piva et al, 2016).…”

Section: Photoluminescence Spectra and Electric Propertiesmentioning

confidence: 91%

“…Thus, a material with low resistance or impedance to modify TiO2 is needed to enhance photodegrading CHOH assisted with an electric field. Fe2O3, a cheap ferromagnetic material, possesses good electrical properties, such as high capacity, high charging rate, long-life usage, and low resistance, which can effectively decrease the insulating behavior of TiO2 (Piva et al, 2016;Ding et al, 2017). Additionally, the interface of Fe2O3 and TiO2 can accelerate the transfer of photoinduced electrons from the conduction band of Fe2O3 to that of TiO2 (Moniz et al, 2014;Wang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Improvement of water resistance by Fe2O3/TiO2 photoelectrocatalysts for formaldehyde removal: experimental and theoretical investigation

Dong

Xia

et al. 2021

Environ Sci Pollut Res

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TiO2-based photocatalysts are a potential technology for removing indoor formaldehyde (CHOH) owing to their strong photooxidation ability. However, their photooxidation performance is generally weakened when suffering from the competitive adsorption of H2O. In a method inspired by the oxygen evolution reaction (OER) to generate intermediates with hydroxyl radicals on the anode electrode catalysts, an electric field was employed in this research and applied to the photooxidation of CHOH to prevent the competitive adsorption of H2O. Additionally, 0.5-5% Fe2O3 decorated TiO2 was employed to improve the photoelectrocatalytic activity. The influence of an electric field on hydroxyl-radical production was investigated by both density functional theory (DFT) with direct-imposed dipole momentum and photoelectrocatalytic experimental tests. The surface characterization of the photocatalysts, including transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR), was conducted. DFT results show that a positive electric field with a strength of 0.05 Å/V was more favorable to produce hydroxyl on Fe2O3/TiO2(010) than was a negative electric field. Fe2O3 decoration can significantly boost hydroxyl formation, resulting from a decrease in the binding energy between the Fe of Fe2O3 and the oxygen and hydrogen atoms of H2O. The dissociated hydrogen atom of the H2O preferentially remained on the catalysts' surface rather than being released into the gas flow. The experimental results demonstrated that the application of a low-voltage of 150 V could not directly enhance the photooxidation of CHOH by either TiO2 or Fe2O3/TiO2 but that it could relieve the H2O inhibitory effect by more than 10% on the Fe2O3/TiO2.

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Section: Photoluminescence Spectra and Electric Propertiesmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Improvement of water resistance by Fe2O3/TiO2 photoelectrocatalysts for formaldehyde removal: experimental and theoretical investigation

Dong

Xia

et al. 2021

Environ Sci Pollut Res

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“…Due to the high costs of manufacturing process of porcelain by using pure raw materials, these have become less attractive for applications such as electrical insulators, while some materials such as polymers, glasses and composites have been considered low-cost alternative to electrical insulation. Thus, research on reducing the production costs of porcelain insulators is an urgent task for companies 14 . In this context, the use of solid wastes to produce electrical porcelain materials has been tested [15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

Use of Firewood Ash Waste in Electrical Siliceous Porcelain

et al. 2019

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The use of firewood ash waste for the production of electric porcelain can represent an important technological and environmental alternative for the final disposal of this abundant solid waste material. This work aims to study the effect of replacing of sodium feldspar (albite) for firewood ash waste in electrical siliceous porcelain formulation. The firewood ash waste was obtained from a ceramic plant located in southeastern Brazil (Campos dos Goytacazes-RJ). For this purpose, siliceous porcelain formulations containing up to 4.2 wt.% of firewood ash waste as a replacement for sodium feldspar were prepared. Disk specimens were pressed and fired at 1300 °C using a fast-firing cycle. The porcelain specimens were tested to determine their technical properties (linear shrinkage, water absorption, apparent porosity, apparent density, tensile strength, and electrical resistivity). The results indicated that test specimens containing up to 4.2 wt.% of firewood ash waste have high potential for use as electrical siliceous porcelain material. Thus, an alternative use of firewood ash waste is proposed, which can be converted into economic gain and also contribute for the environmental sustainability.

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“…In the industrial processing of aluminous porcelain materials an important issue is the cost of the non-renewable pure raw materials 7 . In particular, the aluminous porcelain formulations contain high amount of fluxing materials such as potassium feldspar (rich in K 2 O) and sodium feldspar (rich in Na 2 O)…”

Section: Introductionmentioning

confidence: 99%

“…Aluminous electrical porcelain is a glass-bonded material with excellent technical properties (low water absorption, high electrical resistivity, and high mechanical strength) widely applied to high-tension insulators in electrical power transmission and distribution systems [5][6][7] . The aluminous porcelain formulations consist mainly of a mixture of clay (kaolin and/or plastic clay), fluxing material (feldspars), and filler (alumina) 5,8 .…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Lead Containing TV Tube Glass Waste in Aluminous Porcelain

2017

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The aim of this work was to study the incorporation of lead containing TV tube glass waste as a method to provide alternative raw material for aluminous electrical porcelain. For this purpose, aluminous porcelain formulations containing up to 30 wt.% of TV tube glass waste as a replacement for traditional flux material (sodium feldspar) were pressed and fired in air at 1300 ºC using a fast-firing cycle (< 60 min). X-ray diffraction (XRD), scanning electron microscopy (SEM), linear shrinkage, apparent density, water absorption, and electrical resistivity have been carried out. The results indicated that the aluminous porcelain pieces containing up to 30 wt.% of TV tube glass waste rich in PbO with water absorption between 0.42 and 0.45% and volume electrical resistivity between 1.91 and 2.93 x 10 11 Ω.cm have high potential to work as electrical insulator material. This use of lead containing TV tube glass waste can contribute greatly to reducing the environmental impacts related to it, and also save the sources of non-renewable raw materials used in the electrical porcelain sector.

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Effect of Fe2O3 content on the electrical resistivity of aluminous porcelain applied to electrical insulators

Cited by 23 publications

References 32 publications

Improvement of water resistance by Fe2O3/TiO2 photoelectrocatalysts for formaldehyde removal: experimental and theoretical investigation

Improvement of water resistance by Fe2O3/TiO2 photoelectrocatalysts for formaldehyde removal: experimental and theoretical investigation

Use of Firewood Ash Waste in Electrical Siliceous Porcelain

Incorporation of Lead Containing TV Tube Glass Waste in Aluminous Porcelain

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