Enhanced charge separation and transfer by Bi 2 MoO 6 @Bi 2 Mo 2 O 9 compound using SILAR for photoelectrochemical water oxidation

Xiong, Yuli; Yang, Lin; He, Huichao; Wan, Jing; Xiao, Peng; Guo, Wenlong

doi:10.1016/j.electacta.2018.01.090

Cited by 32 publications

(27 citation statements)

References 45 publications

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“…In recent years, Aurivillius oxide semiconductors with general formula Bi 2 X n –1 Y n O 3 n +3 (X = Ca, Sr, Ba, Pb, Na and Y = Ti, Nb, Ta, Mo, W) have attracted extensive interest owing to their layered structures and outstanding photoelectrical properties. , As the simplest member ( n = 1), bismuth molybdate (Bi 2 MoO 6 ) consists of alternately ranged [Bi 2 O 2 ] 2+ and perovskite slabs (MoO 4 2– ) layers, , which endow it suitable band gap (∼2.85 eV) for visible light absorption and controllable morphology . More attractively, Bi 2 MoO 6 has been proven to be a valuable n-type catalyst in photodegradation, , water oxidation, , and other photoelectrochemical fields. , To reduce the charge recombination and improve the quantum yield, Cu-based semiconductors have been chosen as p-type materials to combine with Bi 2 MoO 6 forming a novel p-n heterojunction due to their special physicochemical properties. − Among them, copper aluminum (CuAl 2 O 4 ), as a promising semiconductor with spinel structure, has been proven to be a valuable visible light photocatalyst because of its appropriate band gap (1.7–2.5 eV), − mechanical strength, physicochemical stability, − resistance to acid or alkali, and low cost. Importantly, the band gap potentials of CuAl 2 O 4 and Bi 2 MoO 6 are perfectly matched to form p-n heterojunction facilitating the charge separation (meet (ii)) and suitable for degrading most organic pollutants (meet (iii)).…”

Section: Introductionmentioning

confidence: 99%

Assembling n-Bi₂MoO₆ Nanosheets on Electrospun p-CuAl₂O₄ Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Zhang

Shao

et al. 2018

ACS Sustainable Chem. Eng.

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Rational construction of heterostructures (especially p-n heterostructures) is an excellent strategy for efficient charge separation and desirable photocatalytic performance. Regretfully, the measurements of charge separation efficiency of p-n heterojunction are often monotonous. In this paper, a well-designed p-CuAl 2 O 4 /n-Bi 2 MoO 6 heterojunction was successfully synthesized by assembling Bi 2 MoO 6 nanosheets (NSs) on the electrospun CuAl 2 O 4 hollow nanofibers (HNFs) through a solvothermal method. The Bi 2 MoO 6 NSs tightly connect with CuAl 2 O 4 HNFs via strong chemical bonding, and the loading amount can be easily controlled by the concentration of precursor. Significantly, for the first time the charge separation efficiency of the heterojunction is systematically investigated via its photoelectrochemical responses under visible light irradiation with and without trapping agents, and the highly efficient charge separation and transfer of the heterojunction is tightly confirmed. Photocatalytic experiments show that the highly efficient charge separation and transfer of the heterojunction results in the enhanced photocatalytic performance for degrading all pollutant models (Rhodamine B, Methyl Orange, Cr(VI), and 4-nitrophenol), whose reaction rate is 1 order of magnitude higher than the reference samples. The work may be useful for rational constructing p-n heterojunctions and provide novel insights to investigate the photoelectrochemical and photocatalytic performance.

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Section: Introductionmentioning

confidence: 99%

Assembling n-Bi₂MoO₆ Nanosheets on Electrospun p-CuAl₂O₄ Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Zhang

Shao

et al. 2018

ACS Sustainable Chem. Eng.

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“…For example, a photoanode composed of Bi 2 MoO 6 @Bi 2 Mo 2 O 9 exhibited a photocurrent density that is 3.6-and 8-fold higher than those of the pristine Bi 2 MoO 6 and Bi 2 Mo 2 O 9 photoanodes, respectively (Fig. 11a) [211]. The band alignment between the Bi 2 MoO 6 and Bi 2 Mo 2 O 9 improves the charge separation and transfer properties (Fig.…”

Section: Molybdenum-based Ternary Oxidesmentioning

confidence: 96%

Recent progress of tungsten- and molybdenum-based semiconductor materials for solar-hydrogen production

Wang

2019

Tungsten

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Semiconductor-based solar water splitting is regarded as one of the most promising technologies for clean hydrogen production. The rational design of semiconductor materials is critically important to achieve high solar-to-hydrogen (STH) conversion efficiencies towards practical applications. A rich family of tungsten-and molybdenum-based materials have been developed as both photocatalysts and cocatalysts for solar-hydrogen production in the past years, providing more opportunities to achieve high solar-to-hydrogen (STH) efficiencies. In this review article, we comprehensively review the recent progress of tungsten-and molybdenum-based materials for solar-hydrogen production. In particular, the strengths and drawbacks of each material system are critically discussed, followed by an overview of the emerging strategies to improve their performances. Finally, the key challenges and possible research directions of tungsten-and molybdenum-based materials are presented, which would provide useful information for the design of efficient semiconductor materials for solar-hydrogen production.

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“…Especially, Bi 2 MoO 6 materials have attracted much attention due to its moderate bandgap (2.6 eV) and appropriate band edge positions for OER. However, the PEC efficiency of Bi 2 MoO 6 photoelectrodes is still dissatisfactory owning to its low mobility of carriers, slow water oxidation kinetics, and high electron‐hole recombination 158,159 …”

Section: Small Bandgap Metal Oxide/g‐c3n4 Heteroarrays As Photoanodesmentioning

confidence: 99%

“…However, the PEC efficiency of Bi 2 MoO 6 photoelectrodes is still dissatisfactory owning to its low mobility of carriers, slow water oxidation kinetics, and high electron-hole recombination. 158,159 To address these issues, a 2D Bi 2 MoO 6 NSA exposed with {0 1 0} facets has been synthesized through a hydrothermal process, which provides the large surface area, low resistance, and exposed oxygen atoms, therefore facilitating the transport of photogenerated electrons and increasing the contact between electrolyte and catalytically active sites. 125 Furthermore, this Bi 2 MoO 6 NSA has also been modified with g-C 3 N 4 NSs by a simple immersion process to enhance the photogenerated charge separation (Figure 9A).…”

Section: Bi 2 Moo 6 /G-c 3 N 4 Heteroarraysmentioning

confidence: 99%

Graphitic carbon nitride (g‐C₃N₄)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting

et al. 2020

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Photoelectrochemical (PEC) water splitting is recognized as a sustainable strategy for hydrogen generation due to its abundant hydrogen source, utilization of inexhaustible solar energy, high‐purity product, and environment‐friendly process. To actualize a practical PEC water splitting, it is paramount to develop efficient, stable, safe, and low‐cost photoelectrode materials. Recently, graphitic carbon nitride (g‐C3N4) has aroused a great interest in the new generation photoelectrode materials because of its unique features, such as suitable band structure for water splitting, a certain range of visible light absorption, nontoxicity, and good stability. Some inherent defects of g‐C3N4, however, seriously impair further improvement on PEC performance, including low electronic conductivity, high recombination rate of photogenerated charges, and limited visible light absorption at long wavelength range. Construction of g‐C3N4‐based nanosized heteroarrays as photoelectrodes has been regarded as a promising strategy to circumvent these inherent limitations and achieve the high‐performance PEC water splitting due to the accelerated exciton separation and the reduced combination of photogenerated electrons/holes. Herein, we summarize in detail the latest progress of g‐C3N4‐based nanosized heteroarrays in PEC water‐splitting photoelectrodes. Firstly, the unique advantages of this type of photoelectrodes, including the highly ordered nanoarray architectures and the heterojunctions, are highlighted. Then, different g‐C3N4‐based nanosized heteroarrays are comprehensively discussed, in terms of their fabrication methods, PEC capacities, and mechanisms, etc. To conclude, the key challenges and possible solutions for future development on g‐C3N4‐based nanosized heteroarray photoelectrodes are discussed.

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Enhanced charge separation and transfer by Bi 2 MoO 6 @Bi 2 Mo 2 O 9 compound using SILAR for photoelectrochemical water oxidation

Cited by 32 publications

References 45 publications

Assembling n-Bi₂MoO₆ Nanosheets on Electrospun p-CuAl₂O₄ Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Assembling n-Bi₂MoO₆ Nanosheets on Electrospun p-CuAl₂O₄ Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Recent progress of tungsten- and molybdenum-based semiconductor materials for solar-hydrogen production

Graphitic carbon nitride (g‐C₃N₄)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting

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Enhanced charge separation and transfer by Bi 2 MoO 6 @Bi 2 Mo 2 O 9 compound using SILAR for photoelectrochemical water oxidation

Cited by 32 publications

References 45 publications

Assembling n-Bi2MoO6 Nanosheets on Electrospun p-CuAl2O4 Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Assembling n-Bi2MoO6 Nanosheets on Electrospun p-CuAl2O4 Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Recent progress of tungsten- and molybdenum-based semiconductor materials for solar-hydrogen production

Graphitic carbon nitride (g‐C3N4)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting

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Assembling n-Bi₂MoO₆ Nanosheets on Electrospun p-CuAl₂O₄ Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Assembling n-Bi₂MoO₆ Nanosheets on Electrospun p-CuAl₂O₄ Hollow Nanofibers: Enhanced Photocatalytic Activity Based on Highly Efficient Charge Separation and Transfer

Graphitic carbon nitride (g‐C₃N₄)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting