Defect-rich decorated TiO<sub>2</sub>nanowires for super-efficient photoelectrochemical water splitting driven by visible light

Anisur, Rahman Md; Bazargan, Samad; Srivastava, Saurabh; Wang, Xiongyao; Abd-Ellah, Marwa; Thomas, Joseph P.; Heinig, Nina F.; Pradhan, Debabrata; Leung, K. T.

doi:10.1039/c5ee01615k

Cited by 94 publications

(63 citation statements)

References 66 publications

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“…The high photocurrent density observed for HDM‐TiO 2 can be attributed to the presence of more oxygen vacancies. This indicates that introducing defect states can be very beneficial for the separation of carriers and slightly decreases the conduction band of TiO 2 (Figure S11 and Table S1) …”

Section: Resultsmentioning

confidence: 95%

“…The nanoscale defect structure directly results in the presence of oxygen vacancies, which slightly decrease the band gap (core part of Figure ). Electrons can transfer from both the valence band and oxygen vacancy state to the conduction band of HDM‐TiO 2 . This is beneficial to both electronic transitions during photocatalysis and high electron conduction during insertion/removal of lithium ions.…”

Section: Resultsmentioning

confidence: 99%

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Hierarchically Dual‐Mesoporous TiO₂ Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Xiao

Lü

et al. 2018

Chemistry A European J

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Hierarchically dual-mesoporous TiO microspheres have been synthesized by a solvothermal process in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF ]) and diethylenetriamine (DETA) as co-templates. Secondary mesostructured defects in the hierarchical TiO microspheres produce oxygen vacancies, which not only significantly enhance photocatalytic activity in the degradation of methylene blue (1.7 times that with P25) and acetone (2.9 times that with P25), but are also beneficial for lithium storage. Moreover, we propose a mechanism to rationalize the role of this dual mesoporosity of the TiO microspheres in enhancing molecular diffusion, ion transportation, and electronic transitions.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Hierarchically Dual‐Mesoporous TiO₂ Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Xiao

Lü

et al. 2018

Chemistry A European J

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“…[24] Therefore, the absorption coefficient of an indirect band gap semiconductor is usually small, especially at the wavelength near the edge of band gap energy. [29] Defect engineering and surface modification can also be utilized to enhance visible light and infrared photocatalytic activity. However, indirect band gap semiconductors are more beneficial for the longer charge carrier lifetime since the electron-hole recombination requires phonon assistance.…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

Nanowire Array Structures for Photocatalytic Energy Conversion and Utilization: A Review of Design Concepts, Assembly and Integration, and Function Enabling

Hoang

Gao

2016

Advanced Energy Materials

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Environmental pollution and the shortage of clean and renewable energy resources are two of the grand challenges the world is facing today. [1] Photocatalysis is one active research area toward the effort of conversion and utilization of sunlight energy to solve these challenges with annual publication of more than 2000 peer-reviewed papers. [2] Photocatalysis finds its potential applications in the direct conversion of sunlight energy into electricity and fuels (hydrogen, hydrocarbons) using photoelectrochemical (PEC) solar cells (dye-sensitized/ quantum-dot-sensitized solar cells) [3][4][5] and photocatalytic waterThe increasing human demand for clean and renewable energy and a cleaner environment has stimulated various materials related research and development for efficient solar energy conversion and utilization, photocatalytic environmental remediation, and photoassisted selective conversion of organic compounds. Among the various candidate solutions to improving the efficiency of these processes, semiconductor nanowire (NW) and nanorod (NR) array structures have been offering a unique tool box combining desirable characteristics in structure, function, and applicability. Efficient photocatalytic energy conversion requires excellent light absorption, readily charge separation, transport, and collection, as well as fast kinetics of interfacial reactions and mass transport of reactants. The long axis of the NW enables adequate light absorption, while the radical axis provides short electron-hole separation distance. Additionally, the NW arrays have relatively high surface area to facilitate interfacial kinetics while their open pore structure allows good mass transport properties. This study reviews the current status of research on NW and NR array structures of some most popular semiconducting materials for photocatalytic energy conversion and utilization including photocatalytic water splitting and CO 2 reduction/fixation, dye/quantum dot sensitized solar cells, and other photoassisted reactive applications such as pollutant degradation, selective conversion of organic compounds, and biological disinfection.

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“…As far as photoelectrocatalytic water splitting is concerned, its reaction rate is mainly determined by electron‐hole separation efficiencies, the recombination rate of photogenerated electron‐hole, electron transport efficiency and surface adsorption efficiency of PEC . This is mainly caused by the complicated interfacial mechanism, involving the formation of surface states, strain field, structural defects, etc ,. Therefore a highly efficient photoelectrocatalyst is required to improve reaction rate of the water splitting process.…”

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

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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.

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Defect-rich decorated TiO₂nanowires for super-efficient photoelectrochemical water splitting driven by visible light

Abstract: Defect-rich 1D TiO2 nanostructures show excellent photoelectrochemical water splitting property in the visible light region with a low onset potential of 0.3 V vs. RHE and a remarkably high conversion efficiency of 3.6%.

Cited by 94 publications

References 66 publications

Hierarchically Dual‐Mesoporous TiO₂ Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Hierarchically Dual‐Mesoporous TiO₂ Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Nanowire Array Structures for Photocatalytic Energy Conversion and Utilization: A Review of Design Concepts, Assembly and Integration, and Function Enabling

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

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Defect-rich decorated TiO2nanowires for super-efficient photoelectrochemical water splitting driven by visible light

Abstract: Defect-rich 1D TiO2 nanostructures show excellent photoelectrochemical water splitting property in the visible light region with a low onset potential of 0.3 V vs. RHE and a remarkably high conversion efficiency of 3.6%.

Cited by 94 publications

References 66 publications

Hierarchically Dual‐Mesoporous TiO2 Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Hierarchically Dual‐Mesoporous TiO2 Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Nanowire Array Structures for Photocatalytic Energy Conversion and Utilization: A Review of Design Concepts, Assembly and Integration, and Function Enabling

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

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Product

Resources

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Defect-rich decorated TiO₂nanowires for super-efficient photoelectrochemical water splitting driven by visible light

Hierarchically Dual‐Mesoporous TiO₂ Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

Hierarchically Dual‐Mesoporous TiO₂ Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

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