Structure and stability studies of electrodeposited ?-BiO

Helfen, Arnaud; Merkourakis, Spyridon; Wang, G.; Walls, Michael; Roy, Emmanuel; Yu-Zhang, K.; Leprince‐Wang, Yamin

doi:10.1016/j.ssi.2004.09.006

Cited by 34 publications

(14 citation statements)

References 13 publications

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“…The average grain size is about 10-20 nm for the as-grown δ-Bi 2 O 3 thin films as estimating from Scherrer equation, which is coincident with the TEM results shown later. This nanocrystalline nature of the thin films is believed responsible for the stabilization of high temperature phase (δ-Bi 2 O 3 ) at room temperature [19,22], in which the nonequilibrium phase stabilized by the nanocrystallites tends to transform to equilibrium phase when the ambient temperature is appropriated. Fig.…”

Section: Resultsmentioning

confidence: 99%

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δ-Bi2O3 thin films prepared by reactive sputtering: Fabrication and characterization

et al. 2006

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Section: Resultsmentioning

confidence: 99%

“…Recently, δ-Bi 2 O 3 has been synthesized by electrodeposition [19,21,22] and chemical vapor deposition [12,23]. One severe disadvantage of the electrodeposition is that the substrates must be conductive materials, which limits the use of the substrate materials.…”

Section: Introductionmentioning

confidence: 99%

δ-Bi2O3 thin films prepared by reactive sputtering: Fabrication and characterization

et al. 2006

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“…Bi2O3 films and powders have been electrochemically synthesized by direct cathodic deposition from Bi (III) solutions [27][28][29][30], and by cathodic electrodeposition of bismuth metal, followed by its further anodic oxidation [31].…”

Section: Ho2• + H2o2→ •Oh + H2o + O2 Eq (3)mentioning

confidence: 99%

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Petrović

Mitrović

Antonijević

et al. 2015

Materials Chemistry and Physics

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This paper reports the synthesis, characterization and application of a Ti-Bi2O3 anode for the electrochemical decolorization of the textile dye Reactive Red 2. The anode was synthesized by electrodeposition on a Ti substrate immersed in an acidic bismuth (III) solution at constant potential, followed by calcination in air at 600°C. Thermogravimetric Analysis (TGA), Energydispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis revealed that the electrodeposited material was predominantly metallic bismuth, which was oxidized to pure α-Bi2O3 during the calcination in air. SEM micrographs revealed that the Bi2O3 coat at the anode surface was inhomogeneous and porous. Reactive Red 2 was completely electrochemically decolorized at the synthesized anode in the presence of H2O2. The applied current density, H2O2 and Na2SO4 concentration, medium pH and initial dye concentration affected the dye decolorization rate. The optimal process parameters were found to be as follows: an applied current density of 40 mA cm -2 using a mixture of 10 mmol dm -3 H2O2 and 10 mmol dm -3 Na2SO4 at pH 7. The dye decolorization rate was shown to decrease as its initial concentration increased. The decolorization reactions were found to follow pseudo-first order kinetics.

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“…3,4 Bismuth(III) oxide, Bi 2 O 3 , is known to appear in five polymorphs, as the α-, β-, γ-, δand ε-phase. 8 Upon cooling, two metastable phases may occur depending on the applied thermal treatment, i.e., the tetragonal β-phase near 650 °C and the body-centered cubic γ-phase near 640 °C. 8 Upon cooling, two metastable phases may occur depending on the applied thermal treatment, i.e., the tetragonal β-phase near 650 °C and the body-centered cubic γ-phase near 640 °C.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2

Zdujić

Poleti²,

Jovalekić

et al. 2009

JSCS

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A powder mixture of α-Bi 2 O 3 and HfO 2 , in the molar ratio 2:3, was mechanochemically treated in a planetary ball mill under air, using zirconium oxide vials and balls as the milling medium. After 50 h of milling, the mechanochemical reaction led to the formation of a nanocrystalline δ-Bi 2 O 3 phase (fluorite-type solid solution Bi 0.78 Hf 0.59 Zr 0.63 O 3.61 ), with a crystallite size of 20 nm. The mechanochemical reaction started at a very beginning of milling accompanied by an accumulation of ZrO 2 arising from the milling tools. The samples prepared after various milling times were characterized by X-ray powder diffraction and DSC analysis. The electrical properties of the as-milled and pressed Bi 0.78 Hf 0.59 Zr 0.63 O 3.61 powder were studied using impedance spectroscopy in the temperature range from 100 to 700 °C under air. The electrical conductivity was determined to be 9.43×10 -6 and 0.080 S cm -1 for the temperatures of 300 and 700 °C, respectively.

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Structure and stability studies of electrodeposited ?-BiO

Cited by 34 publications

References 13 publications

δ-Bi2O3 thin films prepared by reactive sputtering: Fabrication and characterization

δ-Bi2O3 thin films prepared by reactive sputtering: Fabrication and characterization

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2

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