A simple solvothermal process to synthesize CaTiO3 microspheres and its photocatalytic properties

Dong, Weixia; Song, Bin; Meng, Wenqing; Zhao, Gaoling; Han, Gaorong

doi:10.1016/j.apsusc.2015.05.006

Cited by 49 publications

(14 citation statements)

References 33 publications

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“…Here, we report the synthesis of a CaTiO 3− δ using a solvo‐thermal process; this route offers important advantages due to low crystallization temperature, high homogeneity and high purity.…”

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confidence: 99%

“…[20] Drawing inspiration from all the features of the materials above-mentioned, in this study, we have tried to combine the useful properties of the non-stoichiometric titanium-based materials with the functional perovskite crystalline phase (ABO 3 ).Therefore, an oxygen-deficient calcium titanate (CaTiO 3À δ , CTO), a well-known perovskite compound, was used for the first time as Pt/C promoter for the ORR. Even though the photocatalytic properties [21] of CaTiO 3 and its potential applications as dielectric and optical material have been shown, reports on the electrocatalytic behavior of non-stoichiometric orthorhombic Ca-, Ti-based perovskites in acidic media has not yet been studied.Here, we report the synthesis of a CaTiO 3À δ using a solvothermal process; [22] this route offers important advantages due to low crystallization temperature, high homogeneity and high purity.A template-assisted hydrothermal synthesis, followed by a calcination treatment, was used to obtain CaTiO 3À δ (see Experimental Section). The final calcination step, where the polymer template is oxidized, creates a reductive environment near the oxide surface, facilitating the formation of oxygen defects and/or vacancies, as mentioned for zirconium oxide based catalysts.…”

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Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

et al. 2019

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Platinum scarcity and its high cost have led to the requirement of alternative materials catalysing the oxygen reduction reaction (ORR), which is the main rate‐determining step occurring in electrochemical devices, including metal‐air batteries and fuel cells. We report a study on a sub‐stoichiometric calcium titanate (CaTiO3−δ, CTO) compound used as promoter for the ORR in order to reduce the Pt loading and improve its electrocatalytic activity. Composite catalysts based on Pt/C with different amounts of CTO were prepared and their activity was investigated by rotating disk electrode (RDE). The obtained results proved a higher catalytic activity for the composite electrode, with respect to pure Pt/C, in terms of electrochemically active surface area, oxygen reduction current density, onset potential and stability.

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Section: Figurementioning

confidence: 99%

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Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

et al. 2019

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“…At present, the methods of synthesizing perovskite mainly include the solution cooling method, hydrothermal synthesis method, sol-gel method, and solid-phase sintering method. The solid-phase sintering method for synthesizing perovskite, which involves fully mixing raw materials (powder-like), high-temperature calcination and cooling, has obvious advantages, such as a simple and clean process [11][12][13][14]. Yet, since the relatively stable crystalline TiO 2 (anatase or rutile) is used as the titanium source in this method, the reaction speed is slow and the cost is high [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Perovskite by Solid-Phase Method with Metatitanic Acid and Calcium Carbonate and Its Pigment Properties Investigation

et al. 2020

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Synthetic perovskite powder (SPP) was synthesized by the solid-phase method using metatitanic acid (TiO2·nH2O) and calcium carbonate (CaCO3) as raw materials, and its structure, morphology, pigment properties and application in architectural coatings were studied. When TiO2·nH2O and CaCO3 were mixed and ground at a molar ratio of TiO2:CaO = 1:1, and then calcined at 900–1100 °C, SPP with a single perovskite phase was obtained. The characterization results displayed that the unit particle size of SPP was 50–150 nm, the aggregate size was 1–2 μm, and its particles were well dispersed. The SPP also had a whiteness of 90.5%, and an oil absorption of 35.03 g/100 g. The hiding power of SPP was 24.02 g/m2, which was 81.6% of pure TiO2 hiding power (19.60 g/m2). When adding SPP to prepare a building exterior wall coating, the contrast ratio of the coating film was 0.92, which met the requirements of the Chinese national standard GB/T 9755-2014 and was equivalent to adding rutile titanium dioxide. Thus, perovskite synthesized from TiO2·nH2O and CaCO3 by the solid-phase method significantly improved the pigment properties of TiO2 in the same proportion.

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“…Several primary crystalline phases, including CA 6 , CaTiO 3 , CA 2 , corundum, and rutile, have been observed in the Al 2 O 3 -TiO 2 -CaO system. 14 These phases exhibit high melting points, low coefficients of thermal conductivity, low coefficients of thermal expansion, [15][16][17] and low abrasion. These properties can affect the formation of calcium alumino-titanate (CAT), which is a product of melting, homogenizing, de-ironing, and silicon reduction of titanium-iron slag.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of high alumina castables containing calcium alumino‐titanate

Chen

Zhao

Zhang

et al. 2018

Int J Applied Ceramic Tech

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Calcium alumino‐titanate (CAT)‐containing high alumina castables were prepared using bauxite, CAT, and α‐Al2O3 as starting materials, and subsequently heat treated at various temperatures ranging from 1400°C to 1600°C. The thermo‐mechanical properties of the specimens as a function of the temperature were characterized in terms of linear shrinkage, bulk density, apparent porosity, cold crushing strength (CCS), modulus of rupture (MOR), residual ratio of MOR, and coefficient of thermal expansion (CTE). X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine the phase composition and microstructural evolution, respectively. Sintering at temperatures between 1450 and 1500°C promoted normal grain growth, with the formation of a granular surface contact, and abnormal grain growth occurred at higher temperatures (≥ 1550°C). The cold strength of the specimen initially increased and subsequently decreased with temperature, whereas the residual ratio of MOR initially decreased with increasing temperature to 1550°C, then increased above 1550°C. In addition, the CTE of the specimen was only minimally influenced by the firing temperature.

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A simple solvothermal process to synthesize CaTiO3 microspheres and its photocatalytic properties

Cited by 49 publications

References 33 publications

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

Synthesis of Perovskite by Solid-Phase Method with Metatitanic Acid and Calcium Carbonate and Its Pigment Properties Investigation

Microstructure and properties of high alumina castables containing calcium alumino‐titanate

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A simple solvothermal process to synthesize CaTiO3 microspheres and its photocatalytic properties

Cited by 49 publications

References 33 publications

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO3−δ Additive

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO3−δ Additive

Synthesis of Perovskite by Solid-Phase Method with Metatitanic Acid and Calcium Carbonate and Its Pigment Properties Investigation

Microstructure and properties of high alumina castables containing calcium alumino‐titanate

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Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive