Carbon quantum dots modified TiO2 composites for hydrogen production and selective glucose photoreforming

Zhao, Heng; Yu, Xinti; Li, Chaofan; Yu, Wen-Bei; Wang, Aiguo; Hu, Zhi‐Yi; Larter, Stephen R.; Liu, Yu; Kibria, Golam; Hu, Jinguang

doi:10.1016/j.jechem.2021.04.033

Cited by 76 publications

(48 citation statements)

References 45 publications

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“…Herein, numerous strategies have been applied to improve the photocatalytic activity of TiO 2 materials, such as forming heterostructure with other semiconductors, doping, dye sensitization, and exposed facets modification [14,15]. Among them, heterostructures has been revealed to be an efficient method to improve photocatalytic efficiency [16][17][18][19]. As a typical heterostructure, p-n junction constructed by combining a n-type semiconductor (electron-rich) with a p-type semiconductor (hole-rich) can be a very efficient strategy to realize the separation of photogenerated electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

NiO-TiO2 p-n Heterojunction for Solar Hydrogen Generation

et al. 2021

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Photocatalytic water splitting for hydrogen production has been widely recognized as a promising strategy for relieving the pressure from energy crisis and environmental pollution. However, current efficiency for photocatalytic hydrogen generation has been limited due to a low separation of photogenerated electrons and holes. p-n heterojunction with a built-in electric field emerges as an efficient strategy for photocatalyst design to boost hydrogen evolution activities due to a spontaneous charge separation. In this work, we investigated the effect of different preparation methods on photocatalytic hydrogen production over NiO-TiO2 composites. The results demonstrated that a uniform distribution of NiO on a surface of TiO2 with an intimate interfacial interaction was formed by a sol-gel method, while direct calcination tended to form aggregation of NiO, thus leading to an uneven p-n heterojunction structure within a photocatalyst. NiO-TiO2 composites fabricated by different methods showed enhanced hydrogen production (23.5 ± 1.2, 20.4 ± 1.0 and 8.8 ± 0.7 mmolh−1g−1 for S1-20%, S2-20% and S3-10%, respectively) as compared with pristine TiO2 (6.6 ± 0.7 mmolh−1g−1) and NiO (2.1 ± 0.2 mmolh−1g−1). The current work demonstrates a good example to improve photocatalytic hydrogen production by finely designing p-n heterojunction photocatalysts.

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Section: Introductionmentioning

confidence: 99%

NiO-TiO2 p-n Heterojunction for Solar Hydrogen Generation

et al. 2021

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“…This works depicts an innovative strategy to control the carbon quantum dot particle size to carry out metal-free photocatalysis. 106 Hydrogen production using biomass with organic–inorganic hybrid materials and its derivatives are represented in Table 1 .…”

Section: Photocatalyst Materialsmentioning

confidence: 99%

Recent development of organic–inorganic hybrid photocatalysts for biomass conversion into hydrogen production

et al. 2022

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“…The photogenerated h + combines with the absorbed H 2 O to form radical •OH. The CQDs/TiO 2 composites with particular colored CQDs can significantly enhance the selectivity of glucose to arabinose conversion (75%) and the H 2 production activity (2.43 mmol h −1 g −1 ) [ 151 ].…”

Section: Applications Of Cdsmentioning

confidence: 99%

“… Proposed reaction mechanism for glucose photoreforming (reprinted with permission from [ 151 ], 2022, Elsevier). …”

Section: Figurementioning

confidence: 99%

Recent Advances in Synthesis, Modification, Characterization, and Applications of Carbon Dots

Pundi

Chang

2022

Polymers

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Although there is significant progress in the research of carbon dots (CDs), some challenges such as difficulty in large-scale synthesis, complicated purification, low quantum yield, ambiguity in structure-property correlation, electronic structures, and photophysics are still major obstacles that hinder the commercial use of CDs. Recent advances in synthesis, modification, characterization, and applications of CDs are summarized in this review. We illustrate some examples to correlate process parameters, structures, compositions, properties, and performances of CDs-based materials. The advances in the synthesis approach, purification methods, and modification/doping methods for the synthesis of CDs are also presented. Moreover, some examples of the kilogram-scale fabrication of CDs are given. The properties and performance of CDs can be tuned by some synthesis parameters, such as the incubation time and precursor ratio, the laser pulse width, and the average molar mass of the polymeric precursor. Surface passivation also has a significant influence on the particle sizes of CDs. Moreover, some factors affect the properties and performance of CDs, such as the polarity-sensitive fluorescence effect and concentration-dependent multicolor luminescence, together with the size and surface states of CDs. The synchrotron near-edge X-ray absorption fine structure (NEXAFS) test has been proved to be a useful tool to explore the correlation among structural features, photophysics, and emission performance of CDs. Recent advances of CDs in bioimaging, sensing, therapy, energy, fertilizer, separation, security authentication, food packing, flame retardant, and co-catalyst for environmental remediation applications were reviewed in this article. Furthermore, the roles of CDs, doped CDs, and their composites in these applications were also demonstrated.

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Carbon quantum dots modified TiO2 composites for hydrogen production and selective glucose photoreforming

Cited by 76 publications

References 45 publications

NiO-TiO2 p-n Heterojunction for Solar Hydrogen Generation

NiO-TiO2 p-n Heterojunction for Solar Hydrogen Generation

Recent development of organic–inorganic hybrid photocatalysts for biomass conversion into hydrogen production

Recent Advances in Synthesis, Modification, Characterization, and Applications of Carbon Dots

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