Hydrogen evolution using CdWO4 modified by BiFeO3 in the presence of potassium iodide; a combination of photocatalytic and non-photocatalytic water splitting

Karamian, Elham; Sharifnia, Shahram

doi:10.1016/j.ijhydene.2019.08.076

Cited by 38 publications

(11 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Simultaneously, this argument also is supported by the results of electrochemical impedance spectroscopy (EIS). In general, the semicircle curve with the smaller radius represents the smaller impedance of charge transfer, which indicates better photoelectric performance 59,60 . Figure 9D shows that CCNC‐0.1 possesses the smaller high frequency semicircle curve, indicating that the hybrid photocatalysts have the higher conductivity to ensure rapid charge transfer.…”

Section: Resultsmentioning

confidence: 97%

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Meng

Zhou

et al. 2020

J Am Ceram Soc

View full text Add to dashboard Cite

Exploring non‐noble metal photocatalysts with high activity and stability is always fascinating. Herein, the hollow CoS nanocages deriven from ZIF‐67 have been reported for the first time to combine with CeO2 NPs grown in situ for photocatalytic degradation of stubborn pollutants. The unique CoS nanocages not only provide rich active sites but also enhance light capture. CeO2 NPs loaded on the surface accelerate the separation of photocharges and extend the lifetime of photogenerated carriers. The optimized photocatalysts show outstanding activity and stability for the photodegradation of tetracycline and phenol under visible light, and the corresponding photodegradation efficiency is 96.5% and 90.5% at 60 minutes. The novel multi‐stage nanocage structure simultaneously realizes extended light absorption and improved photocharges transfer efficiency. This work provides an exclusive perspective to design high‐efficiency photocatalysts with hollow structures for environmental restoration.

show abstract

Section: Resultsmentioning

confidence: 97%

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Meng

Zhou

et al. 2020

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

“…The conduction band and valence band of BFO and CdS can be calculated by Equation ) and Equation ):

E_{CB} = X - E_{e} - \frac{1}{2} E_{g},

E_{VB} = E_{CB} + E_{g},

where E e is energy of free electrons on the hydrogen scale (∼4.5 eV). X is absolute electronegativity of photocatalyst and is calculated by geometric averaging absolute electronegativity of the constituent atoms (Equation )):

X = \sqrt[N]{x_{1}^{n 1} x_{2}^{n 2} \dots x_{i}^{ni}},

where N , ni , and x i are the total number of atoms, number of species, and electronegativity of the constituent atoms in photocatalyst 50,51 . Values of x i , X , E CB , E VB for BFO and CdS have been listed in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…Also, ε , ε 0 , N D , k , and e are dielectric constant, vacuum permittivity, carrier concentration, Boltzmann constant, and electron charge respectively. T is temperature 50,52 . Mott‐Schottky plots are shown in frequencies of 500, 1000, and 1500 Hz for BFO and 1, 5, and 10 kHz for CdS in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

“…where N, ni, and x i are the total number of atoms, number of species, and electronegativity of the constituent atoms in photocatalyst. 50,51 Values of x i , X, E CB , E VB for BFO and CdS have been listed in of the conduction band and valance band values can also be estimated according to the value of the band gap and the Mott-Schottky plots. The Mott-Schottky relation is as Equation ( 6):…”

Section: Photocatalyst Characterizationmentioning

confidence: 99%

“…T is temperature. 50,52 Mott-Schottky plots are shown in frequencies of 500, 1000, and 1500 Hz for BFO and 1, 5, and 10 kHz for CdS in Figure 7. The intersection of the linear part of the Mott-Schottky plot and the X-axis (potential) shows the potential that the value inside parentheses on the right side of the Equation ( 6) (E − E fb − k B T/ε) is zero.…”

Section: Photocatalyst Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced photocatalytic hydrogen evolution from water splitting by Z‐scheme CdS / BiFeO ₃ heterojunction without using sacrificial agent

Kolivand

Sharifnia

2020

Int J Energy Res

Self Cite

View full text Add to dashboard Cite

Summary Cadmium sulfide (CdS) is one of the most famous photocatalyst for water splitting because of relevant band edge position. But it has disadvantage such as recombination of charge carrier and photocorrosion in pure water that sacrificial materials must be used to fix it. On the other hand, the use of other photocatalysts alongside it can greatly eliminate these disadvantages. So, in favor of boosting photocatalytic efficiency, it was coupled with BiFeO3 that is a promising visible light active perovskite structure and has ferroelectric properties. The CdS and BiFeO3 powders were synthesized by precipitation and hydrothermal methods, respectively. The pure samples and heterojunctions were investigated by XRD, FESEM, transmission electron microscopy, EDX, UV‐vis, PL, N2 adsorption/desorption isotherms, photocurrent density measurement, electrochemical impedance spectroscopy and Mott‐Schottky analysis to compare the structure, composition, morphology, and optical property before and after modification. The maximum photocatalytic activity, 600.2 μmol/g/h was obtained by heterojunction containing 50 wt% BiFeO3 (CB‐50) from pure water. Also from the experiments results, CB‐50 showed much higher reusability than pure CdS. The enhanced stability and photocatalytic activity of CB‐50 are mainly attributed to charge separation as a result of Z‐scheme charge transfer mechanism as well as the increased light absorption efficiency. In addition to increasing hydrogen production, the ability to use pure water in a closed system without additional materials is other advantage of this photocatalyst.

show abstract

Highly Selective Photocatalytic Oxidation Biomass Valorization Over Nb₂O₅/g‐C₃N₄Heterojunction

Zhao

Dong

et al. 2022

Adv Energy and Sustain Res

View full text Add to dashboard Cite

The selective biomass conversion of 5‐hydroxymethylfurfural (HMF) to 2,5‐diformylfurane (DFF) through photocatalysis is of immense importance and has attracted much interest recently. However, its selectivity and conversion are still limited at present due to the lack of efficient photocatalysts to controllably activate the alcohol hydroxyl groups. Herein, Nb2O5/g‐C3N4 type‐II heterojunction photocatalysts to restrain the over‐oxidation are developed, which successfully adjust the active oxygen species and enhance the separation and transfer of photoexcited carriers. The system achieves selective oxidation of HMF to DFF with high selectivity (>99%) and conversion (53%) via the inhibition of hydroxyl radicals (·OH) production arising from the decomposition of H2O2. Moreover, h+ is the main active species for photocatalytic selective oxidation of HMF, and ·O2− is the second for that. Herein, it offers an effective strategy to effectively improve the high‐selective conversion of biomass derivatives into high‐value‐added products.

show abstract

Hydrogen evolution using CdWO4 modified by BiFeO3 in the presence of potassium iodide; a combination of photocatalytic and non-photocatalytic water splitting

Cited by 38 publications

References 49 publications

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Enhanced photocatalytic hydrogen evolution from water splitting by Z‐scheme CdS / BiFeO ₃ heterojunction without using sacrificial agent

Highly Selective Photocatalytic Oxidation Biomass Valorization Over Nb₂O₅/g‐C₃N₄Heterojunction

Contact Info

Product

Resources

About

Hydrogen evolution using CdWO4 modified by BiFeO3 in the presence of potassium iodide; a combination of photocatalytic and non-photocatalytic water splitting

Cited by 38 publications

References 49 publications

Construction of CoS/CeO2 heterostructure nanocages with enhanced photocatalytic performance under visible light

Construction of CoS/CeO2 heterostructure nanocages with enhanced photocatalytic performance under visible light

Enhanced photocatalytic hydrogen evolution from water splitting by Z‐scheme CdS / BiFeO 3 heterojunction without using sacrificial agent

Highly Selective Photocatalytic Oxidation Biomass Valorization Over Nb2O5/g‐C3N4Heterojunction

Contact Info

Product

Resources

About

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Enhanced photocatalytic hydrogen evolution from water splitting by Z‐scheme CdS / BiFeO ₃ heterojunction without using sacrificial agent

Highly Selective Photocatalytic Oxidation Biomass Valorization Over Nb₂O₅/g‐C₃N₄Heterojunction