A Combination of Two Visible-Light Responsive Photocatalysts for Achieving the Z-Scheme in the Solid State

Yun, Hongseok; Lee, Hyunjoo; Kim, Nam Dong; Lee, David Minzae; Yu, Sungju; Yi, Jongheop

doi:10.1021/nn2006738

Cited by 207 publications

(126 citation statements)

References 31 publications

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“…Moreover, the photoexcited holes in the VB of CdS were recombined with electrons from TiO 2 , resulting in improvement in the photostability of CdS. Similarly, the photocatalytic activities of CdS/Au/ZnO and CdS/Au/TiO 1.96 C 0.04 were also improved due to the solid‐state Z‐scheme mechanism 47, 49…”

Section: Z‐scheme Systems With Solid State Electron Mediatorsmentioning

confidence: 98%

“…Noble‐metal particles (such as Au, Ag) and reduced graphene oxide (RGO) were explored as electron mediators for the Z‐scheme system, and a high efficiency of the charge‐carrier separation and transport can be achieved at the interface of the two semiconductors 26, 47, 48…”

Section: Z‐scheme Systems With Solid State Electron Mediatorsmentioning

confidence: 99%

“…Many works studied different connection modes of Z‐scheme photocatalytic systems 13, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, …”

Section: Introductionmentioning

confidence: 99%

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Z‐Scheme Photocatalytic Systems for Promoting Photocatalytic Performance: Recent Progress and Future Challenges

et al. 2016

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Semiconductor photocatalysts have attracted increased attention due to their great potential for solving energy and environmental problems. The formation of Z‐scheme photocatalytic systems that mimic natural photosynthesis is a promising strategy to improve photocatalytic activity that is superior to single component photocatalysts. The connection between photosystem I (PS I) and photosystem II (PS II) are crucial for constructing efficient Z‐scheme photocatalytic systems using two photocatalysts (PS I and PS II). The present review concisely summarizes and highlights recent state‐of‐the‐art accomplishments of Z‐scheme photocatalytic systems with diverse connection modes, including i) with shuttle redox mediators, ii) without electron mediators, and iii) with solid‐state electron mediators, which effectively increase visible‐light absorption, promote the separation and transportation of photoinduced charge carriers, and thus enhance the photocatalytic efficiency. The challenges and prospects for future development of Z‐scheme photocatalytic systems are also presented.

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Section: Z‐scheme Systems With Solid State Electron Mediatorsmentioning

confidence: 98%

Section: Z‐scheme Systems With Solid State Electron Mediatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Z‐Scheme Photocatalytic Systems for Promoting Photocatalytic Performance: Recent Progress and Future Challenges

et al. 2016

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“…Recently, the photocatalysis of Z-scheme heterostructures, adopted from natural photosynthesis, has been well studied in order to identify the charge transport pathway. [11,[102][103][104][105] For example, Ho et al [100] studied CdS-WO 3 heterostructures as a photocatalyst for CO 2 reduction. As illustrated in Figure 7a, for the normal band structure alignment of the heterostructure, the red (dashed) lines from the CB of CdS and that from the VB of WO 3 should be the electron and hole transport pathways, respectively.…”

Section: −1mentioning

confidence: 99%

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

258

116

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photocatalysis based on semiconductors represents another route for light energy conversion. This route endows the direct conversion of light energy into oxidation and reduction energy via charge carriers (electrons and holes) generated in the semiconductors. For instance, the photocatalytic degradation of harmful and toxic organic substances, dyes, and chemicals has been considered to be a suitable candidate for removing organic pollution from water, [5][6][7][8] where photooxidation dominates the degradation of the organic molecules. The full process of photocatalytic water splitting into H 2 and O 2 is believed to be promising for generating renewable and green energy, [9,10] and the process includes the photoreduction and photooxidation of water, respectively. The photocatalytic reduction of CO 2 can convert solar energy into chemical energy, stored as CH 4 , CO, CH 3 OH, etc. [11][12][13] These processes can help reduce the pressure of the global warming crisis and supply usable renewable energy. Due to the precise control of photocatalytic reduction and oxidation, photocatalytic molecular synthesis has also attracted much interest, which provides a sustainable pathway for green synthesis. [14][15][16] For an efficient photocatalytic process, solar light harvesting and a redox process based on photogenerated charge carriers are essential steps. Solar light harvesting consists of light absorption and charge carrier excitation steps, which can be expressed as the light utilization efficiency. The efficiency determines the total energy converted from solar light and is mostly determined by the band structure of the semiconductor applied to the photocatalytic process.The photocatalytic process has been extensively studied by examining the response of photocatalysts to UV light, due to its relatively high photonic energy. As is well known, UV light energy amounts to no more than 5% of the solar light energy. Visible light and near-infrared (NIR) light contain approximately 90% of the solar light energy. To utilize solar light in order to solve the environmental and energy crisis, visible light and NIR-light-activated photocatalysts are essential. For decades, many studies have focused on expanding the range over which a photocatalyst can utilize the solar light spectrum. In addition, there are several good reviews summarizing recent progress on UV-vis-light-activated photocatalysts, as well as strategies to improve the photocatalytic efficiency. [17][18][19][20] As is well known, the photonic energy of visible light is low, and that of NIR light is even lower. Photoinduced redox requires an initial amount of energy to activate the process; however, NIR photonic energy may be too low to realize photoinduced The realization of light-chemical energy conversion using solar light is an ideal goal in renewable energy studies. Many reports are concerned with extracting energy from solar light and the use/storage of the converted energy. Due to the progress in solar light absorption with various photocatalysts, the vari...

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“…While combining two visible light sensitive photocatalysts, CdS and carbon-doped TiO 2 , with Au as the electron-transfer mediator, the combination of CdS/Au/TiO 1.96 C 0.04 , enabling the successful transfer of photogenerated electrons to a higher energy level via the Z-scheme mechanism, produced approximately a four times higher amount of H 2 under visible light irradiation than CdS/Au/TiO 2 [112] . Fu et al [113] developed a novel photocatalytic system (TiO 2 -heteropoly blue) capable of utilizing two light beams including UV and visible light to complete the Z-scheme process.…”

Section: Z-scheme Heterojunctionsmentioning

confidence: 99%

Nanostructure designs for effective solar-to-hydrogen conversion

Shen

Mao

2012

Nanophotonics

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Conversion of energy from photons in sunlight to hydrogen through solar splitting of water is an important technology. The rising signifi cance of producing hydrogen from solar light via water splitting has motivated a surge of developing semiconductor solar-active nanostructures as photocatalysts and photoelectrodes. Traditional strategies have been developed to enhance solar light absorption (e.g., ion doping, solid solution, narrow-band-gap semiconductor or dye sensitization) and improve charge separation/transport to prompt surface reaction kinetics (e.g., semiconductor combination, co-catalyst loading, nanostructure design) for better utilizing solar energy. However, the solar-to-hydrogen effi ciency is still limited. This article provides an overview of recently demonstrated novel concepts of nanostructure designs for efficient solar hydrogen conversion, which include surface engineering, novel nanostructured heterojunctions, and photonic crystals. Those fi rst results outlined in the main text encouragingly point out the prominence and promise of these new concepts principled for designing high-effi ciency electronic and photonic nanostructures that could serve for sustainable solar hydrogen production.

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A Combination of Two Visible-Light Responsive Photocatalysts for Achieving the Z-Scheme in the Solid State

Cited by 207 publications

References 31 publications

Z‐Scheme Photocatalytic Systems for Promoting Photocatalytic Performance: Recent Progress and Future Challenges

Z‐Scheme Photocatalytic Systems for Promoting Photocatalytic Performance: Recent Progress and Future Challenges

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Nanostructure designs for effective solar-to-hydrogen conversion

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