Hydrothermal synthesis of Ag2O/Bi2O3 microspheres for efficient photocatalytic degradation of Rhodamine B under visible light irradiation

Li, Tingting; Luo, Shenglian

doi:10.1016/j.ceramint.2015.07.066

Cited by 21 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to the control sample (not irradiated), only the TiO 2 /QDs film subjected to light irradiation under air shows a prominent binding-energy shift (the binding energy for both Ag 3d and Bi 4f has shifted to higher energy). Oxides form of metal have a higher binding energy as compared to the analogue of metal bromides due to stronger binding of oxide (O 2– ) with metal than bromide (Br – ) . In the present case, we can expect degradation of Cs 2 AgBiBr 6 into silver bromide and bismuth bromide and their oxidation into their respective oxides as photooxidation products.…”

Section: Resultsmentioning

confidence: 68%

“…Oxides form of metal have a higher binding energy as compared to the analogue of metal bromides due to stronger binding of oxide (O 2− ) with metal than bromide (Br − ). 40 In the present case, we can expect degradation of Cs 2 AgBiBr 6 into silver bromide and bismuth bromide and their oxidation into their respective oxides as photooxidation products. The oxygen content of the photoirradiated film in air also increased as compared to the unirradiated film (Table S1).…”

Section: + → + −mentioning

confidence: 63%

See 1 more Smart Citation

Charge Injection from Excited Cs₂AgBiBr₆ Quantum Dots into Semiconductor Oxides

2019

View full text Add to dashboard Cite

Lead-free double perovskites such as Cs2AgBiBr6 are gaining attention because of their environmental friendliness compared to the lead halide perovskites. In order to establish their photoactivity, we have probed the excited-state behavior of Cs2AgBiBr6 nanocrystals and charge injection from their excited state into different metal oxides (TiO2, ZnO). The electron-transfer rate constants determined from ultrafast transient absorption spectroscopy were in the range of 1.2–5.2 × 1010 s–1. Under steady-state photolysis (ambient conditions), the electrons injected into TiO2 are scavenged by atmospheric oxygen, leaving behind holes which accumulate within the quantum dots (QDs). These accumulated holes further induce oxidation of QDs, resulting in the overall photodegradation of perovskite films. Annealed films of Cs2AgBiBr6 nanocrystals, when employed as an active layer in solar cells, delivered photocurrent under visible-light excitation.

show abstract

Section: Resultsmentioning

confidence: 68%

Section: + → + −mentioning

confidence: 63%

Charge Injection from Excited Cs₂AgBiBr₆ Quantum Dots into Semiconductor Oxides

2019

View full text Add to dashboard Cite

show abstract

“…Notably, the most recent studies of Bi 2 O 3 at room conditions have been mainly devoted to the photocatalytic properties of two polymorphs: α-Bi 2 O 3 (bismite) and β-Bi 2 O 3 (sphaerobismoite) [17][18][19][20][21][22][23]. In particular, it has been found that the metastable β phase exhibits better properties, in particular, better photocatalytic activity, than the more stable α phase [17][18][19][20][21] because of the unique tunnel structure of β-Bi 2 O 3 caused by the special orientation of Bi LEPs.…”

Section: Introductionmentioning

confidence: 99%

β−Bi2O3under compression: Optical and elastic properties and electron density topology analysis

et al. 2016

View full text Add to dashboard Cite

We report a joint experimental and theoretical study of the optical properties of tetragonal bismuth oxide (β-Bi 2 O 3 ) at high pressure by means of optical absorption measurements combined with ab initio electronic band structure calculations. Our results are consistent with previous results that show the presence of a second-order isostructural phase transition in Bi 2 O 3 (from β to β ) around 2 GPa and a phase transition above 15 GPa combined with a pressure-induced amorphization above 17-20 GPa. In order to further understand the pressure-induced phase transitions and amorphization occurring in β-Bi 2 O 3 , we theoretically studied the mechanical and dynamical stability of the tetragonal structures of β-and β -Bi 2 O 3 at high pressure through calculations of their elastic constants, elastic stiffness coefficients, and phonon dispersion curves. The pressure dependence of the elastic stiffness coefficients and phonon dispersion curves confirms that the isostructural phase transition near 2 GPa is of ferroelastic nature. Furthermore, a topological study of the electron density shows that the ferroelastic transition is not caused by a change in number of critical points (cusp catastrophe), but by the equalization of the electron densities of both independent O atoms in the unit cell due to a local rise in symmetry. Finally, from theoretical simulations, β -Bi 2 O 3 is found to be mechanically and dynamically stable at least up to 26.7 GPa under hydrostatic conditions; thus, the pressure-induced amorphization reported above 17-20 GPa in powder β -Bi 2 O 3 using methanol-ethanol-water as pressure-transmitting medium could be related to the frustration of a reconstructive phase transition at room temperature and the presence of mechanical or dynamical instabilities under nonhydrostatic conditions.

show abstract

Bismuth oxide-related photocatalysts in green nanotechnology: A critical analysis

Reverberi

Varbanov

Vocciante

et al. 2018

Front. Chem. Sci. Eng.

View full text Add to dashboard Cite

Hydrothermal synthesis of Ag2O/Bi2O3 microspheres for efficient photocatalytic degradation of Rhodamine B under visible light irradiation

Cited by 21 publications

References 35 publications

Charge Injection from Excited Cs₂AgBiBr₆ Quantum Dots into Semiconductor Oxides

Charge Injection from Excited Cs₂AgBiBr₆ Quantum Dots into Semiconductor Oxides

β−Bi2O3under compression: Optical and elastic properties and electron density topology analysis

Bismuth oxide-related photocatalysts in green nanotechnology: A critical analysis

Contact Info

Product

Resources

About

Hydrothermal synthesis of Ag2O/Bi2O3 microspheres for efficient photocatalytic degradation of Rhodamine B under visible light irradiation

Cited by 21 publications

References 35 publications

Charge Injection from Excited Cs2AgBiBr6 Quantum Dots into Semiconductor Oxides

Charge Injection from Excited Cs2AgBiBr6 Quantum Dots into Semiconductor Oxides

β−Bi2O3under compression: Optical and elastic properties and electron density topology analysis

Bismuth oxide-related photocatalysts in green nanotechnology: A critical analysis

Contact Info

Product

Resources

About

Charge Injection from Excited Cs₂AgBiBr₆ Quantum Dots into Semiconductor Oxides

Charge Injection from Excited Cs₂AgBiBr₆ Quantum Dots into Semiconductor Oxides