Engineering oxygen vacancy on rutile TiO2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

Xiao, Fei; Zhou, Wei; Sun, Bowen; Li, Haoze; Qiao, Panzhe; Ren, Liping; Zhao, Xiao‐Jun; Fu, Honggang

doi:10.1007/s40843-018-9222-4

Cited by 72 publications

(42 citation statements)

References 51 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure shows XPS result for O1s of Pt−SrTiO 3 before and after SPS treatment. XPS O1s peaks were observed at 528, 531 and 533 eV which were assigned to absorbed oxygen, oxygen vacancy and lattice oxygen, respectively . The peaks were fitted by Gaussian plot that was indicated change of oxygen vacancy by SPS process.…”

Section: Resultsmentioning

confidence: 99%

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO₃ for Increasing Photocatalytic Water Splitting Activity

et al. 2019

View full text Add to dashboard Cite

Spark plasma sintering (SPS) treatment was studied for Pt dispersed SrTiO 3 as photocatalytic water splitting catalyst. The oxygen vacancy was introduced by SPS treatment and it was found that H 2 formation rate was increased by SPS treatment since large amount of oxygen vacancy was introduced. H 2 formation rate became the highest (6.15 mmol h À 1 g À 1 ) at 2.5 wt% Pt dispersed on SrTiO 3 and this H 2 formation rate was almost double of Pt loaded SrTiO 3 and O 2 formation rate was also much increased (5.66 mmol h À 1 g À 1 ). ESR measurement suggests that amount of Ti 3 + was intense after SPS treatment with 2.5 wt% Pt. Therefore, it seems that the oxygen vacancy introduced by SPS treatment effectively worked for charge separation and photocatalytic activity of SrTiO 3 to water splitting was increased.[a] Y.

show abstract

Section: Resultsmentioning

confidence: 99%

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO₃ for Increasing Photocatalytic Water Splitting Activity

et al. 2019

View full text Add to dashboard Cite

show abstract

“…S3 shows the transmission electron microscopy (TEM) images of the samples synthesized with different conditions and high resolution TEM (HRTEM) images of mesoporous TiO 2 mixed crystals. The lattice spacing of 0.347 and 0.325 nm can be ascribed to the brookite (111) and rutile (110) facets, respectively, [41,46,[53][54][55], which proves that the materials are mixed crystals.…”

Section: The Key Factors Affecting the Morphologymentioning

confidence: 91%

Mesoporous TiO2 mixed crystals for photocatalytic pure water splitting

et al. 2020

View full text Add to dashboard Cite

Semiconductor mesoporous single crystals have attracted considerable attention due to the merits of excellent light absorption ability and large surface area for photocatalysis capability. However, most of the materials have a relative large size (~um), which can hardly suppress the recombination of photogenerated electrons and holes. In this work, we synthesized a series of nano mesoporous TiO 2 mixed crystals (brookite and rutile) with high carrier transfer efficiency, improved mass transfer and diffusion abilities, which are crucial for the outstanding photocatalytic performance. Meanwhile, the key factors in the growth process and mechanism of the mesoporous TiO 2 mixed crystals were addressed. With the assistance of Pt nanoparticles, H 2 and H 2 O 2 production can be simultaneously achieved and the efficiencies can reach up to 9.46 ± 0.56 and 3.29 ± 1.28 μmol mg −1 h −1 , respectively. The H 2 evolution rate is 2.8-fold higher than that of the reported TiO 2 nanoparticle catalyst (3.34 μmol mg −1 h −1). The excellent photocatalytic efficiency can be attributed to the special mixed crystal structure of the mesoporous TiO 2 crystals. This work provides new ideas and guidance for precise synthesis of nano mesoporous TiO 2 mixed crystals and enhancing their water splitting performance with high value-added products.

show abstract

“…As is well known, the solid-solid contact interface is easily aggregated with abundant defects, which enables it to display quasi-continuous energy levels and form Ohmic contact as well. Moreover, the solid-solid contact interface can be optimized to show lower electrical resistance for enhanced charge transfer through the introduction of some defects such as oxygen vacancies [20,31]. In addition, appropriate Zn-doping in CdS has been demonstrated as an effective way to raise the conduction band level, which is in favor of producing stronger reducing electrons to increase the HER property [32].…”

Section: Introductionmentioning

confidence: 99%

Unique Cd1−xZnxS@WO3−x and Cd1−xZnxS@WO3−x/CoOx/NiOx Z-scheme photocatalysts for efficient visible-light-induced H2 evolution

Ruan

Lin

et al. 2019

Sci. China Mater.

View full text Add to dashboard Cite

Artificial Z-scheme photocatalytic systems have received considerable attention in recent years because they can achieve wide light-absorption, high charge-separation efficiency, and strong redox ability simultaneously. Nevertheless, it is still challenging to exploit low-cost and stable Zscheme photocatalysts with highly-efficient H 2 evolution from solar water-splitting so far. Herein, we report a novel all-solidstate Z-scheme photocatalyst Cd 1−x Zn x S@WO 3−x consisting of Cd 1−x Zn x S nanorods coated with oxygen-deficient WO 3−x amorphous layers. The Cd 1−x Zn x S@WO 3−x exhibits an outstanding H 2 evolution reaction (HER) activity as compared with Pt-loaded Cd 1−x Zn x S and most WO 3-and CdS-based photocatalysts, due to the generation of stronger reducing electrons through the appropriate Zn-doping in Cd 1−x Zn x S and the enhanced charge transfer by introducing oxygen vacancies (W 5+ /OVs) into the ultrathin WO 3−x amorphous coatings. The optimal HER rate of Cd 1−x Zn x S@WO 3−x is determined to be 21.68 mmol h −1 g −1 , which is further raised up to 28.25 mmol h −1 g −1 (about 12 times more than that of Pt/Cd 1−x Zn x S) when Cd 1−x Zn x S@WO 3−x is hybridized by CoO x and NiO x dual cocatalysts (Cd 1−x Zn x S@WO 3−x /CoO x /NiO x) through in-situ photo-deposition. Moreover, the corresponding apparent quantum yield (AQY) at 420 nm is significantly increased from 34.6% for Cd 1−x Zn x S@WO 3−x to 60.8% for Cd 1−x Zn x S@WO 3−x /CoO x /NiO x. In addition, both Cd 1−x Zn x-S@WO 3−x and Cd 1−x Zn x S@WO 3−x /CoO x /NiO x demonstrate good stability towards HER. The results displayed in this work will inspire the rational design and synthesis of high-performance nanostructures for photocatalytic applications. Keywords: Z-scheme charge transfer, photocatalytic H 2 evolution , Cd 1−x Zn x S solid solutions, oxygen-deficient WO 3−x amorphous layers, CoO x and NiO x dual cocatalysts

show abstract

Engineering oxygen vacancy on rutile TiO2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

Abstract: ABSTRACT

Cited by 72 publications

References 51 publications

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO₃ for Increasing Photocatalytic Water Splitting Activity

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO₃ for Increasing Photocatalytic Water Splitting Activity

Mesoporous TiO2 mixed crystals for photocatalytic pure water splitting

Unique Cd1−xZnxS@WO3−x and Cd1−xZnxS@WO3−x/CoOx/NiOx Z-scheme photocatalysts for efficient visible-light-induced H2 evolution

Contact Info

Product

Resources

About

Engineering oxygen vacancy on rutile TiO2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

Abstract: ABSTRACT

Cited by 72 publications

References 51 publications

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO3 for Increasing Photocatalytic Water Splitting Activity

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO3 for Increasing Photocatalytic Water Splitting Activity

Mesoporous TiO2 mixed crystals for photocatalytic pure water splitting

Unique Cd1−xZnxS@WO3−x and Cd1−xZnxS@WO3−x/CoOx/NiOx Z-scheme photocatalysts for efficient visible-light-induced H2 evolution

Contact Info

Product

Resources

About

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO₃ for Increasing Photocatalytic Water Splitting Activity

Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO₃ for Increasing Photocatalytic Water Splitting Activity