Enhanced visible light photocatalytic activity of BiFeO3-ZnO p-n heterojunction for CO2 reduction

Karamian, Elham; Sharifnia, Shahram

doi:10.1016/j.mseb.2018.12.023

Cited by 55 publications

(31 citation statements)

References 26 publications

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“…Also, all heterojunction shows cutoff wavelength between 518 and 595 nm. Band gaps of CdS and BFO are estimated to be 2.4 and 2.08 eV, respectively, by E g = 1240/ λ 43,45 . This is also approvable by Tauc plot method (Figure 6B).…”

Section: Resultsmentioning

confidence: 66%

“…Band gaps of CdS and BFO are estimated to be 2.4 and 2.08 eV, respectively, by E g = 1240/λ. 43,45 This is also approvable by Tauc plot method ( Figure 6B). According the Tauc Equation (1) 33 :…”

Section: Photocatalyst Characterizationmentioning

confidence: 60%

“…KNbO 3 24 and BaTiO 3 28,42 are other perovskite which were coupled with CdS and showed a promoted photocatalytic activity. Perovskite structure of bismuth ferrite (BiFeO 3 ) has been emerged as a visible light active photocatalyst with band gap of 2.0 to 2.7 eV, good chemical stability, photoelectric, and ferromagnetic features at room temperature 15,16,43‐47 . Most of the research done on BFO is related to water treatment and according to our studies, no research has been found related to water splitting by CdS/BFO heterojunction.…”

Section: Introductionmentioning

confidence: 77%

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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

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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.

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Section: Resultsmentioning

confidence: 66%

Section: Photocatalyst Characterizationmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 77%

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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

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“…Other factors that influence the PC activity of heterojunctions are photoabsorption, carrier concentration, and stability. Karamian and Sharifnia [ 31 ] synthesized BiFeO 3 –ZnO p–n junction to enhance visible‐light PC activity. Compared with pure BiFeO 3 , the light absorption increased from 600 to 419 nm, and a space charge region with an interfacial electric field at the interface of the two photocatalysts orienting from n‐type (ZnO) to p‐type (BiFeO 3 ) was formed ( Figure a,b).…”

Section: Heterojunctionsmentioning

confidence: 99%

Section: Heterojunctionsmentioning

confidence: 99%

Junction Engineering for Photocatalytic and Photoelectrocatalytic CO₂ Reduction

Liu

Zhang

2020

Solar RRL

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Artificial photosynthesis of clean fuels shows fascinating prospects for solving the energy crisis and environmental pollution. However, the solar conversion efficiency is too low to fulfill industrialization requirements, which is confined by the poor photon utilization, severe recombination of electrons and holes, and insufficient reactive sites. Fortunately, junction engineering displays outstanding performance in conquering the aforementioned problems. Herein, an updated fundamental understanding of various junction engineering for enhancing the efficiency, selectivity, and stability of solar‐driven CO2 reduction is provided. The recent progresses of heterojunctions, homojunctions, and multijunctions for photocatalytic (PC) and photoelectrochemical (PEC) CO2 reduction are focused on, especially their essential roles in facilitating the key PC or PEC processes, including charge separation and transfer, adsorption and activation of CO2, and desorption of products, which may provide an interactively referential development pathway for CO2 photoreduction. Finally, an outlook on the current challenges and perspectives of junction engineering design of photocatalysts for solar‐driven CO2 reduction is provided.

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Preparation of Iron‐Doped Carbon Dots and Their Application in Photocatalytic Reduction of Carbon Dioxide

Dang

Feng

et al. 2022

ChemPhotoChem

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Photocatalytic carbon dioxide (CO2) reduction technology is considered a promising approach to alleviate greenhouse gas emissions in the earth's atmosphere. Carbon dots (CDs), which possess good optical properties, are of keen interest in the field of photocatalysis. Iron (Fe), a transition metal element with vacant 3d orbital that contributes to the electron‐transfer process, is a promising metal dopant for CDs that allows for the preparation of multifunctional CDs. Fe‐doped carbon dots (Fe−CDs) were synthesized using ethylenediamine tetraacetic acid disodium (EDTA‐2Na) and ferric chloride (FeCl3 ⋅ 6H2O) through a simple one‐step hydrothermal method. The chemical structure of the obtained Fe−CDs was studied, and their activity for the photocatalytic reduction of CO2 was tested. The results show that Fe doping amount of 13.0 wt.% is the most favorable for the photocatalytic reaction. The maximum photocatalytic reduction of CO2 to methanol reaches 654.28 μmol ⋅ g−1 ⋅ h−1 within 6 h, which is about 2.6 times of the methanol yield of CDs, which is attributed to high electron transfer rate of Fe dopant.

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Enhanced visible light photocatalytic activity of BiFeO3-ZnO p-n heterojunction for CO2 reduction

Cited by 55 publications

References 26 publications

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

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

Junction Engineering for Photocatalytic and Photoelectrocatalytic CO₂ Reduction

Preparation of Iron‐Doped Carbon Dots and Their Application in Photocatalytic Reduction of Carbon Dioxide

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Enhanced visible light photocatalytic activity of BiFeO3-ZnO p-n heterojunction for CO2 reduction

Cited by 55 publications

References 26 publications

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

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

Junction Engineering for Photocatalytic and Photoelectrocatalytic CO2 Reduction

Preparation of Iron‐Doped Carbon Dots and Their Application in Photocatalytic Reduction of Carbon Dioxide

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

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

Junction Engineering for Photocatalytic and Photoelectrocatalytic CO₂ Reduction