Insights into the excitonic processes in polymeric photocatalysts

Wang, Hui; Jiang, Shenlong; Chen, Shichuan; Zhang, Xiaodong; Shao, Wei; Xiao, Sun; Zhao, Zhi; Zhang, Qun; Luo, Yi; Xie, Yi

doi:10.1039/c7sc00307b

Cited by 150 publications

(172 citation statements)

References 39 publications

Supporting

Mentioning

155

Contrasting

Unclassified

Order By: Relevance

“…For some semiconductors, the conduction band potential is not negative enough to reduce water, or the valence band potential is not positive enough to oxidize water. [60] After the excitation, electrons are transferred from/to water for the oxidation/reduction of water, as depicted in the above discussions. In other cases, even the band levels are in the suitable positions to realize overall water splitting, but the simultaneous water reduction and water oxidation are too challenging both thermodynamically and kinetically.…”

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

“…In these cases, a sacrificial reagent is indispensable to achieve the photocatalytic half reaction of water splitting. [60] In addition to semiconductor materials, organic dyes can also provide photoactivated electrons for water splitting. The selected sacrificial reagent has fast reduction/oxidation kinetics on the semiconductor surface.…”

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

See 1 more Smart Citation

Solar‐to‐Hydrogen Energy Conversion Based on Water Splitting

Zhang

Cao

2017

Advanced Energy Materials

491

250

View full text Add to dashboard Cite

Artificial photosynthesis provides a blueprint to harvest solar energy to sustain the future energy demands. Solar‐driven water splitting, converting solar energy into hydrogen energy, is the prototype of photosynthesis. Various systems have been designed and evaluated to understand the reaction pathways and/or to meet the requirements of potential applications. In solar‐to‐hydrogen conversion, electrocatalytic hydrogen and oxygen evolution reactions are key research areas that are meaningful both theoretically and practically. To utilize hydrogen energy, fuel cell technology has been extensively investigated because of its high efficiency in releasing chemical energy. In this review, general concepts of the photosynthesis in green plants are discussed, different strategies for the light‐driven water splitting proposed in laboratories are introduced, the progress of electrocatalytic hydrogen and oxygen evolution reactions are reviewed, and finally, the reactions in hydrogen fuel cells are briefly discussed. Overall, the mass and energy circulation in the solar‐hydrogen‐electricity circle are delineated. The authors conclude that attention from scientists and engineers of relevant research areas is still highly needed to eliminate the wide disparity between the aspirations and realities of artificial photosynthesis.

show abstract

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

Solar‐to‐Hydrogen Energy Conversion Based on Water Splitting

Zhang

Cao

2017

Advanced Energy Materials

491

250

View full text Add to dashboard Cite

show abstract

“…[44,43] Andererseits beobachten Xie et al auch durch TAS-Bildung Tr iplett-Zuständen in Kohlenstoffnitriden, obwohl die Kreuzung zwischen den Systemen innerhalb weniger Pikosekunden erfolgt. [45] Abbildung 4efasst die Dynamik des angeregten Zustands in K-PHI zusammen.…”

Section: Forschungsartikelunclassified

Kalium‐Polyheptazinimid: Ein übergangsmetallfreier Festkörper‐Triplett‐Sensibilisator in Kaskadenenergietransfer und [3+2]‐Cycloadditionen

et al. 2020

View full text Add to dashboard Cite

Polymere Kohlenstoffnitridmaterialien wurden erfolgreich in zahlreichen Anwendungen zur Umwandlung von Licht in Energie, die von der Photokatalyse bis zur Optoelektronik reichen, eingesetzt. Für eine neue Anwendung und Modellierung verfeinerten wir zunächst die Kristallstruktur von Kalium‐Polyheptazinimid (K‐PHI) – einem Referenz‐Kohlenstoffnitridmaterial in der Photokatalyse – mithilfe von Röntgenpulverdiffraktometrie und Transmissionselektronenmikroskopie. Unter Verwendung der Kristallstruktur von K‐PHI wurden periodische DFT‐Berechnungen durchgeführt, um die Zustandsdichte zu berechnen und Intra‐Banden‐Zustände (IBS) zu lokalisieren. Es wurde festgestellt, dass IBS für die erhöhte Absorption von K‐PHI im nahen IR‐Bereich verantwortlich sind, als Elektronenfallen dienen und bei Energietransferreaktionen nützlich sind. Einmal mit sichtbarem Licht angeregt, können Kohlenstoffnitride neben der direkten Rekombination auch Intersystem Crossing vom Singulett‐ in den Triplett‐Zustand durchlaufen. Wir nutzen die angeregten zentrierten Triplett‐Zustände im K‐PHI, um eine Kaskade von Energieübertragungsreaktionen auszulösen und im Gegenzug z. B. Singulett‐Sauerstoff (1O2), als Ausgangspunkt für die Synthese von bis zu 25 verschiedenen N‐reichen Heterozyklen, zu sensibilisieren.

show abstract

“…Moreover, the occurrence of long‐living emission (Figure d) reveals once more the complexity of electronic processes in pCN thin films . Long‐living emission spectra have been recorded with different excitation wavelengths (350, 370, 390 nm) and with a large impulse‐detection delay of 10 ms.…”

mentioning

confidence: 98%

Shine Bright Like a Diamond: New Light on an Old Polymeric Semiconductor

et al. 2020

View full text Add to dashboard Cite

Brilliance usually refers to the light reflected by the facets of a gemstone such as diamond due to its high refractive index. Nowadays, high‐refractive‐index materials find application in many optical and photonic devices and are mostly of inorganic nature. However, these materials are usually obtained by toxic or expensive production processes. Herein, the synthesis of a thin‐film organic semiconductor, namely, polymeric carbon nitride, by thermal chemical vapor deposition is presented. Among polymers, this organic material combines the highest intrinsic refractive index reported so far with high transparency in the visible spectrum, even reaching the range of diamond. Eventually, the herein presented deposition of high quality thin films and their optical characteristics open the way for numerous new applications and devices in optics, photonics, and beyond based on organic materials.

show abstract

Insights into the excitonic processes in polymeric photocatalysts

Cited by 150 publications

References 39 publications

Solar‐to‐Hydrogen Energy Conversion Based on Water Splitting

Solar‐to‐Hydrogen Energy Conversion Based on Water Splitting

Kalium‐Polyheptazinimid: Ein übergangsmetallfreier Festkörper‐Triplett‐Sensibilisator in Kaskadenenergietransfer und [3+2]‐Cycloadditionen

Shine Bright Like a Diamond: New Light on an Old Polymeric Semiconductor

Contact Info

Product

Resources

About