Effect of Co2+ and Ni2+ co-doping on SnO2 synthesized via phytogenic method for photoantioxidant studies and photoconversion of 4-nitrophenol

Matussin, Shaidatul Najihah; Harunsani, Mohammad Hilni; Tan, Ai Ling; Cho, Moo Hwan; Khan, Mohammad Mansoob

doi:10.1016/j.mtcomm.2020.101677

Cited by 19 publications

(11 citation statements)

References 41 publications

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“…Additionally, it is seen from Figure 1 that the doping with 2.5–7.5 at.% Co causes no peaks’ shift. This may be because the two ions Co 2+ and Sn 4+ have very close ionic radii of 0.74 Å and 0.71 Å, respectively [ 20 ]. Carbon doping (10–50 wt.%) into SnO 2 resulted in a slight shift (by 0.26°) towards lower 2θ values [ 3 ].…”

Section: Resultsmentioning

confidence: 99%

“…Then, 18 at.% Mo doping into SnO 2 prepared by the magnetron co-sputtering technique shrank the E g from 3.65 to 2.7 eV [ 14 ]. Additionally, 10 at.% (Co, Ni) doping reduced the E g of SnO 2 NPs synthesized using a green process from 3.33 to 2.08 eV [ 20 ]. Moreover, Pd doping (1–5 wt.%) narrowed E g of SnO 2 from 3.65 to 3.25 eV [ 18 ].…”

Section: Resultsmentioning

confidence: 99%

“…The 100 nm thick film doped with 3.0 wt.% Er exhibited a maximum response for NO 2 at RT. Ni and Co co-doped SnO 2 NPs with crystallite sizes between 12.5 and 22 nm and grains sizes between 50.36 and 78.2 nm were produced by Matussin et al using a biogenic and ecologically benign approach [ 20 ]. These NPs showed enhanced activity as photo-antioxidants and in photoconversion of 4-nitrophenol under visible light irradiation.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Co Doping and Annealing Temperature on the Electrochemical Performance and Structural Characteristics of SnO2 Nanoparticulate Photoanodes

et al. 2022

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Obtaining H2 energy from H2O using the most abundant solar radiation is an outstanding approach to zero pollution. This work focuses on studying the effect of Co doping and calcination on the structure, morphology, and optical properties of spin-coated SnO2 films as well as their photoelectrochemical (PEC) efficiency. The structures and morphologies of the films were investigated by XRD, AFM, and Raman spectra. The results confirmed the preparation of SnO2 of the rutile phase, with crystallite sizes in the range of 18.4–29.2 nm. AFM showed the granular structure and smooth surfaces having limited roughness. UV-Vis spectroscopy showed that the absorption spectra depend on the calcination temperature and the Co content, and the films have optical bandgap (Eg) in the range of 3.67–3.93 eV. The prepared samples were applied for the PEC hydrogen generation after optimizing the sample doping ratio, using electrolyte (HCl, Na2SO4, NaOH), electrode reusability, applied temperature, and monochromatic illumination. Additionally, the electrode stability, thermodynamic parameters, conversion efficiency, number of hydrogen moles, and PEC impedance were evaluated and discussed, while the SnO2 films were used as working electrodes and platinum sheet as an auxiliary or counter electrode (2-electrode system) and both were dipped in the electrolyte. The highest photocurrent (21.25 mA/cm2), number of hydrogen moles (20.4 mmol/h.cm2), incident photon-to-current change efficiency (6.892%@307 nm and +1 V), and the absorbed photon-to-current conversion efficiency (4.61% at ~500 nm and +1 V) were recorded for the 2.5% Co-doped SnO2 photoanode that annealed at 673 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Impact of Co Doping and Annealing Temperature on the Electrochemical Performance and Structural Characteristics of SnO2 Nanoparticulate Photoanodes

et al. 2022

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“…Guo et al obtained SnO2 electrode with an energy gap of 1.74 V after (Ni, S)-co-doping [33]. Additionally, Matussin et al reduced the band gap energy from 3.33 eV for SnO2 to 2.08 eV for 10at% (Co, Ni)-SnO2 [34]. Moreover, Jasim et al reported the reduction in the Eg of SnO2 from 3.7 to 2.5 eV for SnO2:Co: Cu-H nanoparticles [35] Figure 4b shows (αhν) 2 vs. hν, the Tauc plots for determination of E g , which are obtained by linear extrapolation to the abscissa axis.…”

Section: Ftir and Uv-vis Spectroscopymentioning

confidence: 99%

Design of SnO2:Ni,Ir Nanoparticulate Photoelectrodes for Efficient Photoelectrochemical Water Splitting

et al. 2022

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Currently, hydrogen generation via photocatalytic water splitting using semiconductors is regarded as a simple environmental solution to energy challenges. This paper discusses the effects of the doping of noble metals, Ir (3.0 at.%) and Ni (1.5–4.5 at.%), on the structure, morphology, optical properties, and photoelectrochemical performance of sol-gel-produced SnO2 thin films. The incorporation of Ir and Ni influences the position of the peaks and the lattice characteristics of the tetragonal polycrystalline SnO2 films. The films have a homogeneous, compact, and crack-free nanoparticulate morphology. As the doping level is increased, the grain size shrinks, and the films have a high proclivity for forming Sn–OH bonds. The optical bandgap of the un-doped film is 3.5 eV, which fluctuates depending on the doping elements and their ratios to 2.7 eV for the 3.0% Ni-doped SnO2:Ir Photoelectrochemical (PEC) electrode. This electrode produces the highest photocurrent density (Jph = 46.38 mA/cm2) and PEC hydrogen production rate (52.22 mmol h−1cm−2 at −1V), with an Incident-Photon-to-Current Efficiency (IPCE% )of 17.43% at 307 nm. The applied bias photon-to-current efficiency (ABPE) of this electrode is 1.038% at −0.839 V, with an offset of 0.391% at 0 V and 307 nm. These are the highest reported values for SnO2-based PEC catalysts. The electrolyte type influences the Jph values of photoelectrodes in the order Jph(HCl) > Jph(NaOH) > Jph(Na2SO4). After 12 runs of reusability at −1 V, the optimized photoelectrode shows high stability and retains about 94.95% of its initial PEC performance, with a corrosion rate of 5.46 nm/year. This research provides a novel doping technique for the development of a highly active SnO2-based photoelectrocatalyst for solar light-driven hydrogen fuel generation.

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“…Uncolored pollutants such as p -nitrophenol (also known as 4-nitrophenol (4-NP)) are well recognized to be anthropogenic and stable in nature, in which at a high amount, the mineralization or degradation of 4-NP would be difficult. Exposure to this could lead to the development of severe symptoms such as vomiting, headaches, and impairment of organs such as the liver, kidney, and central nervous system in both human beings and animals . Moreover, the stability and solubility of 4-NP in water might lead to environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

et al. 2023

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As one of the most significant rare earth oxides, the redox ability of cerium oxide (CeO 2 ) has become the primary factor that has attracted considerable interest over the past decades. In the present study, irregular pentagonal CeO 2 (S-CeO 2 ) and different amounts of (1, 4, 8, and 12% Co) cobalt-doped CeO 2 nanoparticles (Co-CeO 2 NPs) with particle sizes between 4 and 13 nm were synthesized via the microwave-assisted synthesis method. The structural, optical, and morphological studies of S-CeO 2 and Co-CeO 2 were carried out using various techniques. The shifts in the conduction band and valence band were found to cause the reduction of the band gap energies of S-CeO 2 and Co-CeO 2 NPs. Moreover, the quenching of photoluminescence intensity with more Co doping showed the enhanced separation of charge carriers. The photocatalytic activities of S-CeO 2 and Co-CeO 2 NPs for methylene blue dye degradation, 4-nitrophenol reduction, and their photoantibacterial properties under visible-light irradiation were investigated. Findings showed that, due to the lower band gap energy (2.28 eV), more than 40% of both photocatalytic activities were observed for 12% Co-CeO 2 NPs. On the other hand, higher antibacterial impact in the presence of light shows that the Co doping has a considerable influence on the photoantibacterial response of Co-CeO 2 . Therefore, microwave-assisted synthesized CeO 2 and Co-CeO 2 NPs have shown potential in photocatalytic dye degradation, chemical reduction, and photoantibacterial activities.

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Effect of Co2+ and Ni2+ co-doping on SnO2 synthesized via phytogenic method for photoantioxidant studies and photoconversion of 4-nitrophenol

Cited by 19 publications

References 41 publications

The Impact of Co Doping and Annealing Temperature on the Electrochemical Performance and Structural Characteristics of SnO2 Nanoparticulate Photoanodes

The Impact of Co Doping and Annealing Temperature on the Electrochemical Performance and Structural Characteristics of SnO2 Nanoparticulate Photoanodes

Design of SnO2:Ni,Ir Nanoparticulate Photoelectrodes for Efficient Photoelectrochemical Water Splitting

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

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Effect of Co2+ and Ni2+ co-doping on SnO2 synthesized via phytogenic method for photoantioxidant studies and photoconversion of 4-nitrophenol

Cited by 19 publications

References 41 publications

The Impact of Co Doping and Annealing Temperature on the Electrochemical Performance and Structural Characteristics of SnO2 Nanoparticulate Photoanodes

The Impact of Co Doping and Annealing Temperature on the Electrochemical Performance and Structural Characteristics of SnO2 Nanoparticulate Photoanodes

Design of SnO2:Ni,Ir Nanoparticulate Photoelectrodes for Efficient Photoelectrochemical Water Splitting

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO2

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Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂