Significantly enhanced photocatalytic hydrogen production performance of g-C3N4/CNTs/CdZnS with carbon nanotubes as the electron mediators

Feng, Chang; Chen, Zhuoyuan; Jing, Jiangping; Sun, Mengmeng; Tian, Jing; Lu, Guoguang; Ma, Li; Li, Xiangbo; Hou, Jian

doi:10.1016/j.jmst.2020.11.047

Cited by 83 publications

(31 citation statements)

References 58 publications

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“…It can be seen that Cd 3d 5/2 and 3d 3/2 peaks are present at 404.6 eV and 411.4 eV, which is well-matched with reports. 34,35 Two peaks at 1044.8 eV and 1021.7 eV were observed in the Zn 2p curve, where Zn 2p 1/2 and Zn 2p 3/2 are clearly distinguished, as demonstrated in Fig. 2E.…”

Section: Resultsmentioning

confidence: 80%

A Cd_xZn_1−xS/TiO₂ nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

2022

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Section: Resultsmentioning

confidence: 80%

A Cd_xZn_1−xS/TiO₂ nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

2022

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“…Other typical characterizations were also applied to demonstrate the charge transfer and separation conditions of samples. Figure a shows that the PL intensity decreased from pure CNNs, CNNs/WO 3 to CNNs/WO 3 /WS 2 , suggesting that the separation of charge carriers was accelerated effectually . Five on–off recycle tests were carried out as shown in Figure b to compare the migration speed of photogenerated electrons.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Figure 8a shows that the PL intensity decreased from pure CNNs, CNNs/WO 3 to CNNs/WO 3 /WS 2 , suggesting that the separation of charge carriers was accelerated effectually. 40 Five on−off recycle tests were carried out as shown in Figure 8b to compare the migration speed of photogenerated electrons. The lowest intensity was observed in the curve of CNNs on account of the poor conductivity of g-C 3 N 4 .…”

Section: Photocatalytic Performancementioning

confidence: 99%

2D Layered g-C₃N₄/WO₃/WS₂ S-Scheme Heterojunctions with Enhanced Photochemical Performance

et al. 2021

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Graphitic carbon nitride (g-C 3 N 4 )/WO 3 /WS 2 ternary heterojunctions were fabricated for the first time via in situ growing WO 3 and WS 2 on superior thin g-C 3 N 4 nanosheets. A mechanic chemical prereaction plays an important role in the formation of S-scheme heterojunctions. Namely, the heterostructured photocatalyst prepared by optimized preparation conditions revealed enhanced photodegrading activity (∼8.6 times of pure g-C 3 N 4 ) for organic pollutants in the visible light region. Compared with g-C 3 N 4 nanosheets, the rate of hydrogen generation increased to ∼7.8 times higher, in which the apparent quantum efficiency at 420 nm reached 8.9%. Particularly, the as-prepared ternary photocatalyst exhibited a hydrogen generation rate of 29 μmol g −1 h −1 even without Pt loaded. The matched energy band structure, band bending effect, and intimate interface contact of the 2D/2D g-C 3 N 4 /WO 3 heterojunction together determined the Sscheme electron transfer path. Photogenerated electrons and holes with high redox capacities were reserved to participate in the photocatalytic process. In addition, the oxygen vacancies and WS 2 improved light response and further promoted the separation of charge carriers. This result offered a new idea for the construction of metal-free photocatalysts to be applied in the photochemistry field.

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“…To realize the multifunctional applications of a single catalytic system, seeking and developing an appropriate semiconductor is important. Among available semiconductors, chalcogenide compounds (CdS, CdZnS, and ZnIn 2 S 4 ) have been reported to demonstrate wide abilities for organic transformations, H 2 production, sterilization, and pollution degradation. − However, the photocatalytic performance of a single chalcogenide compound is unsatisfactory due to insufficient light absorption, low charge separation, and sluggish surface reaction kinetics . To solve such problems, coupling cocatalysts is favored for its simple operation, effective improvement of charge separation, and light absorption .…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Ni₃N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation

Cheng

et al. 2022

Inorg. Chem.

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Charge separation and transfer are the dominating factors in achieving high activity of solar energy-based photocatalysis. Here, a plasmonic transition metal nitride, Ni 3 N, nanosheet was fabricated and employed as an efficient cocatalyst to couple with Cd 0.9 Zn 0.1 S (CZS) solid solution via a self-assembly method to form a novel Ni 3 N/CZS heterojunction with an intimate interface. On one hand, localized surface plasmon resonance of the Ni 3 N nanosheets endowed the fabricated Ni 3 N/CZS composite with a wide-spectrum light absorption capacity, even to the nearinfrared range. On the other hand, Ni 3 N as a cocatalyst can not only effectively induce the directional electron transfer from CZS to Ni 3 N active sites but also enhance the surface charge separation efficiency of the Ni 3 N/CZS heterojunction by 4.1 times compared to that of pure CZS. Plasmonic Ni 3 N also provided a photothermal effect to enhance the surface temperature of the composite for boosting the catalytic reaction kinetics. As a result, under visible light irradiation, the optimal Ni 3 N/CZS composite exhibited simultaneous H 2 generation and benzaldehyde formation rates of 35.08 and 16.44 mmol g −1 h −1 , which were 9.4 and 5.9 times those of CZS, respectively; and the composite also demonstrated a strong antibacterial ability with a sterilization rate of 99.7% toward Escherichia coli. Besides that, under NIR light, plasmonic Ni 3 N offered extra hot electrons that can transfer back to CZS to take part in the photocatalytic reaction, leading to the Ni 3 N/CZS composite still having a high H 2 production of 179.6 μmol g −1 h −1 . This work focuses on developing and applying novel plasmonic cocatalysts in photocatalysis for achieving adjustable electron transfer and fast charge separation for extensive practical application.

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Significantly enhanced photocatalytic hydrogen production performance of g-C3N4/CNTs/CdZnS with carbon nanotubes as the electron mediators

Cited by 83 publications

References 58 publications

A Cd_xZn_1−xS/TiO₂ nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

A Cd_xZn_1−xS/TiO₂ nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

2D Layered g-C₃N₄/WO₃/WS₂ S-Scheme Heterojunctions with Enhanced Photochemical Performance

Plasmonic Ni₃N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation

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Significantly enhanced photocatalytic hydrogen production performance of g-C3N4/CNTs/CdZnS with carbon nanotubes as the electron mediators

Cited by 83 publications

References 58 publications

A CdxZn1−xS/TiO2 nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

A CdxZn1−xS/TiO2 nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

2D Layered g-C3N4/WO3/WS2 S-Scheme Heterojunctions with Enhanced Photochemical Performance

Plasmonic Ni3N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation

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A Cd_xZn_1−xS/TiO₂ nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

A Cd_xZn_1−xS/TiO₂ nanotube array electrode for a highly sensitive and selective nonenzymatic photoelectrochemical glucose sensor

2D Layered g-C₃N₄/WO₃/WS₂ S-Scheme Heterojunctions with Enhanced Photochemical Performance

Plasmonic Ni₃N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation