TiO<sub>2</sub>/Cu<sub>2</sub>O Core/Ultrathin Shell Nanorods as Efficient and Stable Photocatalysts for Water Reduction

Liu, Yuanxu; Zhang, Bingsen; Luo, Liuxuan; Chen, Xuanye; Wang, Zhonglei; Wu, Erlong; Su, Dangsheng; Huang, Weixin

doi:10.1002/ange.201509115

Cited by 25 publications

(14 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To further increase the separation efficiency of the photogenerated holes and electrons, core-shell structured p-n junctions are fabricated because of the enhanced contact area. [139,140] Tang and co-workers have prepared highly efficient core/ shells structured ZnO/TiO 2 p-n heterojunction nanorods via a www.advancedsciencenews.com hydrothermal method. [141] In this system, there are two inner electric fields between n-type ZnO and p-type Zn 2+ -doped Ti 2 O 3 , and between p-type Zn 2+ -doped Ti 2 O 3 and n-type TiO 2 .…”

Section: P-n Heterojunctionsmentioning

confidence: 99%

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Zhang

et al. 2020

Advanced Energy Materials

125

View full text Add to dashboard Cite

currents, geothermal, biomass, and solar, have been developed as alternatives. Among them, solar energy is the most abundant, inexpensive, nonpolluting, and sustainable. [5][6][7][8] Some semiconductors, so called photocatalysts, which possess the capacity to harvest solar energy to drive catalytic reactions for valuable chemical production, have been designed and fabricated to achieve efficient solar energy utilization. [9][10][11][12][13][14][15][16][17][18][19] Typically, TiO 2 is recognized as one of the most promising candidates due to its chemical stability, nontoxicity, and high resistance to photocorrosion. [20][21][22][23][24][25] In general, TiO 2 possesses three major phases, including anatase, rutile and brookite, and many other minor phases, such as monoclinic TiO 2 (B). All of them have wide bandgaps of 3.0-3.2 eV. Hence, TiO 2 can only absorb ultraviolet light (UV), while the visible light accounting for ≈43% of solar energy cannot be utilized. Furthermore, the rapid recombination of photogenerated electrons and holes severely limits its quantum efficiency. Thus, overall photocatalytic activity of TiO 2 is very limited, especially under visiblelight irradiation. [26][27][28] A complete photocatalytic reaction using TiO 2 -based photocatalysts involves three major steps: i) light absorption and The photocatalytic properties of TiO 2 have aroused a broad range of research interest since 1972 due to its abundance, chemical stability, and easily available nature. To increase its overall activity, in the past few decades, much effort has been devoted to the fabrication of advanced TiO 2 -based photocatalysts with visible-light response and these photocatalysts have shown great potential in the field of solar energy utilization. Here, recent progress in the investigation of visible-light responsive TiO 2 -based materials are reviewed. Notably, the fabrication strategies and corresponding chemical/ physical properties of visible-light responsive TiO 2 -based materials are described in detail, with a focus on bandgap engineering and junction engineering from the perspective of light absorption, charge transfer and separation, and surface reactions. Their applications in solar-fuel production, organic synthesis, bacterial disinfection, pollutant degradation and nitrogen fixation are also discussed. Moreover, the new trends and ongoing challenges in this field are proposed and highlighted.

show abstract

Section: P-n Heterojunctionsmentioning

confidence: 99%

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Zhang

et al. 2020

Advanced Energy Materials

125

View full text Add to dashboard Cite

show abstract

“…Compared with the N-CD-decorated m-WO 3 , the C 1s and N 1s peaks in the N,Cu-CDs/m-WO 3 -0.8 nanocomposite underwent shifts, which was caused by the chelation between the Cu and N-CDs (Orozco-Guareño et al, 2010). In addition, as shown in the Cu 2p spectra of the N,Cu-CDs/m-WO 3 -0.8 ( Figure 4F), the Cu components with their Cu 2p 3/2 and Cu 2p 1/2 binding energies at 932.56 and 952.34 eV were characteristic of Cu 1+ , while the shoulder peaks at 934.97 eV for Cu 2p 3/2 and 954.67 eV for Cu 2p 1/2 could be ascribed to Cu 2+ (Orozco-Guareño et al, 2010;Liu et al, 2015;and Li et al, 2014). The transformable valence states of Cu demonstrated that the N,Cu-CDs could serve as multielectron redox reaction sites for the efficient electron migration.…”

Section: Crystal Structure and Element Analysismentioning

confidence: 98%

N,Cu-CD-Decorated Mesoporous WO3 for Enhanced Photocatalysis Under UV–Vis–NIR Light Irradiation

Yan

Yang

et al. 2021

Front. Mater.

View full text Add to dashboard Cite

Research on the design of semiconductor photocatalysts with rapid electron transfer efficiencies and broad-spectrum responses for environmental remediation remains a pressing challenge. Herein, we described the fabrication of a novel broad-spectrum nitrogen and copper codoped carbon dots/mesoporous WO3 nanocomposite (N,Cu-CDs/m-WO3), which exhibited complete UV–vis–NIR spectrum response, light harvesting capabilities, rich oxygen vacancies, rapid electron-transfer ability, low electron–hole (e−/h+) pair recombination rate, and extensive specific surface area. After 2 h of photocatalytic reaction, it showed excellent photoactivities for the degradation of rhodamine B, methylene blue, tetracycline hydrochloride, oxytetracycline, ciprofloxacin, and bisphenol A. Moreover, we found that the conversion between Cu (II) and Cu (I) played a key role in accelerating electron transfer and inhibiting the recombination of e−/h+ pairs. This work provides an efficient strategy for the utilization of solar light and enhancing the charge-transfer capacity in the semiconductor photocatalysis field.

show abstract

“…Meanwhile, due to the significant impact on material properties ranging from ionic conductivity, charge localization to surface reactivity, defect modulation has become one of the most promising emerging strategies for developing high‐efficiency photocatalysts ,. Tremendous studies demonstrate that oxygen vacancy (Vo) states can remarkably affect the surface adsorption and reactivity of semiconductors ,,.…”

Section: Introductionmentioning

confidence: 99%

Defective Bi₂WO₆‐Supported Cu Nanoparticles as Efficient and Stable Photoelectrocatalytic for Water Splitting in Near‐Neutral Media

Liang

Qin

et al. 2018

Energy Tech

View full text Add to dashboard Cite

Defective Bi2WO6‐supported Cu nanoparticles photoelectrocatalyst were successfully synthesized via an etching approach by using NaBH4 as reducing agent. The as‐prepared Cu/Bi2WO6‐1 was dominated by CuO and Cu and Cu/Bi2WO6‐2 was dominated by metallic Cu, confirmed by XPS and TEM analyses. These etching pretreatments also induced the formation of defect sites such as oxygen vacancies and W5+. The presence of oxygen vacancies could significantly increase the photogenerated electrons capture abilities. Metallic Cu nanocrystals on the surface of Bi2WO6 photoanodes are beneficial for the photoresponse range as well as the separation and consumption of photogenerated carriers due to the surface plasmon resonance effect of Cu. Photoelectrochemical studies demonstrated that Cu/Bi2WO6‐x exhibited a markedly improved PEC performance in water splitting reaction as compared to that of Bi2WO6 which mainly because of the light harvesting efficiency (ηabs) and the interfacial charge transfer efficiency. Importantly, Cu/Bi2WO6‐2 exhibited the best PEC activity with a high current density and good stability under neutral conditions, which may be ascribed to the defective Bi2WO6 structure in combination with surface ligand engineering and the synergistic effect of oxygen vacancies and metallic Cu. In addition, the function mechanism of CuO, metallic Cu and oxygen vacancies were discussed in details.

show abstract

TiO₂/Cu₂O Core/Ultrathin Shell Nanorods as Efficient and Stable Photocatalysts for Water Reduction

Cited by 25 publications

References 33 publications

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

N,Cu-CD-Decorated Mesoporous WO3 for Enhanced Photocatalysis Under UV–Vis–NIR Light Irradiation

Defective Bi₂WO₆‐Supported Cu Nanoparticles as Efficient and Stable Photoelectrocatalytic for Water Splitting in Near‐Neutral Media

Contact Info

Product

Resources

About

TiO2/Cu2O Core/Ultrathin Shell Nanorods as Efficient and Stable Photocatalysts for Water Reduction

Cited by 25 publications

References 33 publications

Visible‐Light Responsive TiO2‐Based Materials for Efficient Solar Energy Utilization

Visible‐Light Responsive TiO2‐Based Materials for Efficient Solar Energy Utilization

N,Cu-CD-Decorated Mesoporous WO3 for Enhanced Photocatalysis Under UV–Vis–NIR Light Irradiation

Defective Bi2WO6‐Supported Cu Nanoparticles as Efficient and Stable Photoelectrocatalytic for Water Splitting in Near‐Neutral Media

Contact Info

Product

Resources

About

TiO₂/Cu₂O Core/Ultrathin Shell Nanorods as Efficient and Stable Photocatalysts for Water Reduction

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Defective Bi₂WO₆‐Supported Cu Nanoparticles as Efficient and Stable Photoelectrocatalytic for Water Splitting in Near‐Neutral Media