Near‐Infrared‐Responsive Photocatalysts

Yang, Yi; Tan, Haiyan; Cheng, Bei; Fan, Jiajie; Ho, Wingkei

doi:10.1002/smtd.202001042

Cited by 122 publications

(56 citation statements)

References 181 publications

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“…[62] Some metal NPs such as Au, Ag, and Cu can harvest visible light to generate e − 's via surface plasmon resonance (SPR) excitation, [63] expanding the absorption range into the visible-light region. [64,65] As early as 2010, Teranishi et al deposited Au NPs on anatase TiO 2 and observed enhanced H 2 O 2 production, achieving a yield over 10 mmol L −1 . [66] The oxidation and reduction sites were TiO 2 and Au NPs, respectively.…”

Section: Deposition Of Metal Nanoparticlesmentioning

confidence: 99%

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Wang

Zhang

et al. 2021

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Hydrogen peroxide (H 2 O 2 ) is a mild but versatile oxidizing agent with extensive applications in bleaching, wastewater purification, medical treatment, and chemical synthesis. The state-of-art H 2 O 2 production via anthraquinone oxidation is hardly considered a cost-efficient and environment-friendly process because it requires high energy input and generates hazardous organic wastes. Photocatalytic H 2 O 2 production is a green, sustainable, and inexpensive process which only needs water and gaseous dioxygen as the raw materials and sunlight as the power source. Inorganic metal oxide semiconductors are good candidates for photocatalytic H 2 O 2 production due to their abundance in nature, biocompatibility, exceptional stability, and low cost. Progress has been made to enhance the photocatalytic activity toward H 2 O 2 production, however, H 2 O 2 photosynthesis is still in the laboratory research phase since the productivity is far from satisfaction. To inspire innovative ideas for boosting the H 2 O 2 yield in photocatalysis, the most well-studied metal oxide photocatalysts are selected and the modification strategies to improve their activity are listed. The mechanisms for H 2 O 2 production over modified photocatalysts are discussed to highlight the facilitating role of the modification methods. Besides, methods for the quantification of H 2 O 2 and associated radical intermediates are provided to guide future studies in this field.

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Section: Deposition Of Metal Nanoparticlesmentioning

confidence: 99%

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Wang

Zhang

et al. 2021

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“…In 2 S 3 has a narrow band gap of 2.0-2.3 eV, which has been extensively studied in photocatalysis and recognised as a promising candidate for heterojunction formation with TiO 2 [39][40][41]. Recently, a new concept of step-scheme (S-scheme) heterojunction has been proposed [42].…”

Section: Introductionmentioning

confidence: 99%

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

et al. 2021

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Photocatalytic production of hydrogen peroxide (H 2 O 2 ) is an ideal pathway for obtaining solar fuels. Herein, an S-scheme heterojunction is constructed in hybrid TiO 2 /In 2 S 3 photocatalyst, which greatly promotes the separation of photogenerated carriers to foster efficient H 2 O 2 evolution. These composite photocatalysts show a high H 2 O 2 yield of 376 μmol/(L•h). The mechanism of charge transfer and separation within the S-scheme heterojunction is well studied by computational methods and experiments. Density functional theory and in-situ irradiated X-ray photoelectron spectroscopy results reveal distinct features of the S-scheme heterojunction in the TiO 2 /In 2 S 3 hybrids and demonstrate charge transfer mechanisms. The density functional theory calculation and electron paramagnetic resonance results suggest that O 2 reduction to H 2 O 2 follows stepwise one-electron processes. In 2 S 3 shows a much stronger interaction with O 2 than TiO 2 as well as a higher reduction ability, serving as the active sites for H 2 O 2 generation. The work provides a novel design of S-scheme photocatalyst with high H 2 O 2 evolution efficiency and mechanistically demonstrates the improved separation of charge carriers.

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“…UV and visible light can be directly utilized to induce the formation of photogenerated carriers via the modification of photocatalysts, − including narrowing the band gap, decorating with photosensitizers, building heterojunctions, and so on. Nevertheless, the energy of infrared light is not enough to directly excite the electron transition in photocatalysts . Therefore, the strategies of upconversion and photothermal conversion were developed to convert near-infrared light into high-energy light or heat, respectively, which can increase photogenerated carriers or change their behavior .…”

Section: Introductionmentioning

confidence: 99%

Interfacial Design to Enhance Photocatalytic Hydrogen Evolution via Optimizing Energy and Mass Flows

Zhou

Dong

Huang

et al. 2021

ACS Appl. Mater. Interfaces

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Energy and mass transfer in photocatalytic systems plays a significant role in photocatalytic water splitting, but relevant research has long been ignored. Here, an interfacial photocatalytic mode for photocatalytic hydrogen production is exploited to optimize the energy and mass flows and mainly includes a heat-insulating layer, a water-channel layer, and a photothermal photocatalytic layer. In this mode, the energy flow is optimized for efficient spreading, conversion, and utilization. A low-loss path (ultrathin water film) and an efficient heat localized zone are constructed, where light energy, especially infrared-light energy, can transfer to the target functional membrane surface with low loss and the thermal energy converted from light can be localized for further use. Meanwhile, the optimization of the mass flow is achieved by improving the desorption capacity of the products. The generated hydrogen bubbles can rapidly leave from the surface of the photocatalyst, along with the active sites being released timely. Consequently, the photocatalytic hydrogen production rate can be increased up to about 6.6 times that in a conventional photocatalytic mode. From the system design aspect, this work provides an efficient strategy to improve the performance of photocatalytic water splitting by optimizing the energy and mass flows.

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Near‐Infrared‐Responsive Photocatalysts

Cited by 122 publications

References 181 publications

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

Interfacial Design to Enhance Photocatalytic Hydrogen Evolution via Optimizing Energy and Mass Flows

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Near‐Infrared‐Responsive Photocatalysts

Cited by 122 publications

References 181 publications

Inorganic Metal‐Oxide Photocatalyst for H2O2 Production

Inorganic Metal‐Oxide Photocatalyst for H2O2 Production

TiO2/In2S3 S-scheme photocatalyst with enhanced H2O2-production activity

Interfacial Design to Enhance Photocatalytic Hydrogen Evolution via Optimizing Energy and Mass Flows

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Product

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Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production