Defect enhances photocatalytic activity of ultrathin TiO2 (B) nanosheets for hydrogen production by plasma engraving method

Kong, Xiangchen; Xu, Yiming; Cui, Zhenduo; Li, Zhaoyang; Liang, Yanqin; Gao, Zhonghui; Zhu, Shengli; Yang, Xianjin

doi:10.1016/j.apcatb.2018.02.019

Cited by 138 publications

(61 citation statements)

References 46 publications

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“…This indicates that the anatase/rutile composition and crystallite size of the SiTi is left unchanged in the bulk sample. This does not rule out changes to the surface of the SiTi materials, as XRD does not have sufficient sensitivity to detect such changes, as shown by both Zhuang et al [37] (for a He plasma system) and Kong et al [20] (Ar plasma).…”

Section: Resultsmentioning

confidence: 99%

“…Ultimately, a synergism between these two defects, which was found to be dependent on the Si/Ti ratio, governed catalytic performance towards the oxidation of formic acid. Similar to high temperature hydrogenation, plasma treatment can be used to modify a metal oxide, however, the generation of defects via plasma treatment occurs primarily at the material surface, rather than in the bulk [20]. The highly energetic discharge particles can modify the surface in a short time, especially compared to time-consuming thermal treatments, via charge transfer, sputtering, or deposition [21].…”

Section: Introductionmentioning

confidence: 99%

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Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

et al. 2019

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The generation of structural defects in metal oxide catalysts offers a potential pathway to improve performance. Herein, we investigated the effect of thermal hydrogenation and low-temperature plasma treatments on mixed SiO2/TiO2 materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti3+ in the bulk TiO2. In contrast, low temperature plasma treatment for 10 or 20 min generated surface Ti3+ species via the removal of oxygen on both the neat and hydrogenated material. Assessing the photocatalytic activity of the materials demonstrated a 40–130% increase in the rate of formic acid oxidation after plasma treatment. A strong relationship between the Ti3+ content and catalyst activity was established, although a change in the Si–Ti interaction after plasma treating of the neat SiO2/TiO2 material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti3+.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

et al. 2019

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“…This indicated that there were some defects on the surface of TiO 2 after plasma treatment [55]. The Raman scattering selection rule was broken, indicating the surface characteristics of the disordered phase [56]. Raman analysis showed that the molecular vibration of the surface crystallinity of TiO 2 was seriously affected by the plasma treatment.…”

Section: Resultsmentioning

confidence: 99%

“…The band gap of each sample was estimated by the simulation calculation, TiO 2 was 3.21 eV and the Ar-TiO 2 was 3.17 eV (inset of Figure 3a). This value is the effect of the extrapolation to zero (αhν) 1/2 curve on photon energy, where α is the absorption factor and hν is the light quantum energy [53,56]. Based on the XPS valence band (VB) spectrum (Figure 3b), the valence band position of Ar-TiO 2 was 2.93 eV, which was lower than the original TiO 2 (3.02 eV).…”

Section: Resultsmentioning

confidence: 99%

“…However, in Figure 5f, after plasma treatment (Ar-TiO 2 ), the surface of TiO 2 changed significantly, localized regions were destroyed and uneven, lattice defects were generated, and many deformations occurred. The lattice can increase the amorphous crystal structure and oxygen vacancies [56]. Therefore, defects on the surface of the catalyst after plasma treatment expose more active sites, improving photocatalytic activity.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

Wang

et al. 2019

Nanomaterials

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The dye wastewater produced in the printing and dyeing industry causes serious harm to the natural environment. TiO2 usually shows photocatalytic degradation of dye under the irradiation ultravilet light rather than visible light. In this work, a large number of oxygen vacancies and Ti3+ defects were generated on the surface of the TiO2 nanoparticles via Ar plasma. Compared with pristine TiO2 nanoparticles, the as-obtained Ar plasma-treated TiO2 (Ar-TiO2) nanoparticles make the energy band gap reduce from 3.21 eV to 3.17 eV and exhibit enhanced photocatalytic degradation of organic dyes. The Ar-TiO2 obtained exhibited excellent degradation properties of methyl orange (MO); the degradation rate under sunlight irradiation was 99.6% in 30 min, and the photocatalytic performance was about twice that of the original TiO2 nanoparticles (49%). The degradation rate under visible light (λ > 400 nm) irradiation was 89% in 150 min, and the photocatalytic performance of the Ar-TiO2 was approaching ~4 times higher than that of the original TiO2 nanoparticles (23%). Ar-TiO2 also showed good degradation performance in degrading rhodamine B (Rho B) and methylene blue (MB). We believe that this plasma strategy provides a new method for improving the photocatalytic activity of other metal oxides.

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Surface Defect Engineering in 2D Nanomaterials for Photocatalysis

Xiong

Xia

et al. 2018

Adv Funct Materials

535

271

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2D Nanomaterials, with unique structural and electronic features, have shown enormous potential toward photocatalysis fields. However, the photocatalytic behavior of pristine 2D photocatalysts are still unsatisfactory, and far below the requirements of practical applications. In this regard, surface defect engineering can serve as an effective means to tune photoelectric parameters of 2D photocatalysts through tailoring the local surface microstructure, electronic structure, and carrier concentration. In this review, recent progress in the design of surface defects with the classified anion vacancy, cation vacancy, vacancy associates, pits, distortions, and disorder on 2D photocatalysts to boost the photocatalytic performance is summarized. The strategies for controlling defects formation and technique to distinguish various surface defects are presented. The crucial roles of surface defects for photocatalysis performance optimization are proposed and advancement of defective 2D photocatalysts toward versatile applications such as water oxidation, hydrogen production, CO 2 reduction, nitrogen fixation, organic synthesis, and pollutants removal are discussed. Surface defect modulated 2D photocatalysts thus represent a powerful configuration for further development toward photocatalysis.

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Defect enhances photocatalytic activity of ultrathin TiO2 (B) nanosheets for hydrogen production by plasma engraving method

Cited by 138 publications

References 46 publications

Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation

Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

Surface Defect Engineering in 2D Nanomaterials for Photocatalysis

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