Controlled synthesis of Sn-based oxides via a hydrothermal method and their visible light photocatalytic performances

Wang, Jinghui; Li, Hui; Meng, Sugang; Ye, Xiangju; Fu, Xianliang; Chen, Shifu

doi:10.1039/c7ra04041e

Cited by 72 publications

(49 citation statements)

References 61 publications

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“…Figure 5 b reports the DR spectra of SnO 2 _C with respect to a commercial SnO 2 powder: both of the samples exhibit absorption curves that are characteristic of semiconductor materials; however, the position of the absorption edge varies greatly between the two samples. While the commercial oxide shows a light absorption only in the UV region, in good agreement with literature band gap values for SnO 2 [ 18 , 19 ], the SnO 2 _C sample presents a red-shifted absorption edge that leads to a marked visible light absorption up to ca. 500 nm.…”

Section: Resultssupporting

confidence: 88%

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Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO2: A Combined Ti K-Edge and Sn L2,3-Edges X-ray Absorption Investigation

et al. 2020

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Sn-modification of TiO2 photocatalysts has been recently proposed as a suitable strategy to improve pollutant degradation as well as hydrogen production. In particular, visible light activity could be promoted by doping with Sn2+ species, which are, however, thermally unstable. Co-promotion with N and Sn has been shown to lead to synergistic effects in terms of visible light activity, but the underlying mechanism has, so far, been poorly understood due to the system complexity. Here, the structural, optical, and electronic properties of N,Sn-copromoted, nanostructured TiO2 from sol-gel synthesis were investigated: the Sn/Ti molar content was varied in the 0–20% range and different post-treatments (calcination and low temperature hydrothermal treatment) were adopted in order to promote the sample crystallinity. Depending on the adopted post-treatment, the optical properties present notable differences, which supports a combined role of Sn dopants and N-induced defects in visible light absorption. X-ray absorption spectroscopy at the Ti K-edge and Sn L2,3-edges shed light onto the electronic properties and structure of both Ti and Sn species, evidencing a marked difference at the Sn L2,3-edges between the samples with 20% and 5% Sn/Ti ratio, showing, in the latter case, the presence of tin in a partially reduced state.

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Section: Resultssupporting

confidence: 88%

“…However, the doping of SnO 2 by Sn 2+ has been recently reported to induce visible light activity in the semiconductor. Additionally, in this case, reducing conditions are required during the synthesis, leading to yellowish powders [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO2: A Combined Ti K-Edge and Sn L2,3-Edges X-ray Absorption Investigation

et al. 2020

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“…These molecules are possibly regarded to the surface hydroxylation of SnO 2 , coordinated as Sn(OH) 4 , as a remnant of polycondensation step during coprecitation [21] . These OH groups undergo oxidation by the holes ( h + ) formed in the catalyst valence band when under UV, leading to the formation of hydroxyl radicals (⋅OH) with high oxidizing power (−SnOH+ h + ↔−Sn 2+ +⋅OH) [22] .…”

Section: Figurementioning

confidence: 99%

“…Adsorbed OH‐ groups on the catalyst surface this potential to 1.6 V vs NHE, favoring the radical formation [3] . Therefore, the attack of these radicals leads to oxidation reactions, indicating that the indirect photodegradation mechanism plays an important role in the photoactivity of the synthesized SnO 2 samples [21,23] …”

Section: Figurementioning

confidence: 99%

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

Torres

Silva

et al. 2020

ChemPhysChem

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Tin dioxide (SnO2) has intrinsic characteristics that do not favor its photocatalytic activity. However, we evidenced that surface modification can positively influence its performance for CO2 photoreduction in the gas phase. The hydroxylation of the SnO2 surface played a role in the CO2 affinity decreasing its reduction potential. The results showed that a certain selectivity for methane (CH4), carbon monoxide (CO), and ethylene (C2H4) is related to different SnO2 hydrothermal annealing. The best performance was seen for SnO2 annealed at 150 °C, with a production of 20.4 μmol g−1 for CH4 and 16.45 μmol g−1 for CO, while for SnO2 at 200 °C the system produced more C2H4, probably due to a decrease of surface −OH groups.

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“…The maximal photocurrent density of Sn-2 is over 200 μA cm −2 , about four times larger than that of sample Sn-1. This value is much larger than ever reported self-powered photodetectors (SPPDs) [28], 75 μA cm −2 in SnO x [29] and 60 μA cm −2 in Sn 2+ -SnO 2 composites [30]. To investigate the changes of the electrochemical specific surface area, the difference in current density variation plotted against scan rate is shown in figure 4(b).…”

Section: Resultsmentioning

confidence: 77%

SnO_x@β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell

Zheng

Zeng

Xia

et al. 2020

Mater. Res. Express

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To improve the effective separation of the photogenerated electrons and holes, SnO x @β-SnO composites on titanium meshes were prepared by using a standard one-step hydrothermal procedure. As photoanodes in photoelectrochemical cell, the SnO x @β-SnO composites exhibited a photocurrent density of 150 μA cm −2 at 0.0 V versus Ag/AgCl under visible light illumination. The improved photocurrent can be explained as, the Sn 2+ 5s impurity states in SnO 2 have a band gap energy of 2.24 eV, SnO x @β-SnO composites construct a type-II heterojunction. And titanium meshes have a good conductivity, which is beneficial to transferring electron from the conduction band of SnO 2 to external circuit. Furthermore, the SnO x @β-SnO heterostructures have a larger electrochemical specific surface area, and stronger light absorption from 350-800 nm.

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Controlled synthesis of Sn-based oxides via a hydrothermal method and their visible light photocatalytic performances

Abstract: Controlled synthesize of Sn-oxides was achieved via a facile hydrothermal method with SnCl2 as precursor. A visible light photocatalytic activity of SnO2 can be induced by doping with Sn2+ or coupling with SnO.

Cited by 72 publications

References 61 publications

Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO2: A Combined Ti K-Edge and Sn L2,3-Edges X-ray Absorption Investigation

Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO2: A Combined Ti K-Edge and Sn L2,3-Edges X-ray Absorption Investigation

Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

SnO_x@β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell

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Controlled synthesis of Sn-based oxides via a hydrothermal method and their visible light photocatalytic performances

Abstract: Controlled synthesize of Sn-oxides was achieved via a facile hydrothermal method with SnCl2 as precursor. A visible light photocatalytic activity of SnO2 can be induced by doping with Sn2+ or coupling with SnO.

Cited by 72 publications

References 61 publications

Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO2: A Combined Ti K-Edge and Sn L2,3-Edges X-ray Absorption Investigation

Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO2: A Combined Ti K-Edge and Sn L2,3-Edges X-ray Absorption Investigation

Experimental Evidence of CO2 Photoreduction Activity of SnO2 Nanoparticles

SnO x @β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell

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Product

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Experimental Evidence of CO₂ Photoreduction Activity of SnO₂ Nanoparticles

SnO_x@β–SnO heterostructures and their enhanced photocurrent in photoelectrochemical cell