Photochemistry of carbon nitrides and heptazine derivatives

2021 ◽  
Author(s):  
Doyk Hwang ◽  
Cody W. Schlenker
Keyword(s):  
Carbon Nitride ◽  
Monomer Unit ◽  
Carbon Nitrides

This article highlights the photochemistry of heptazine derivatives, a structural monomer unit of carbon nitride photocatalysts.

scholarly journals Understanding spontaneous dissolution of crystalline layered carbon nitride for tuneable photoluminescent solutions and glasses

2021 ◽  
Author(s):  
Adam J. Clancy ◽  
Theo M. Suter ◽  
Alaric Taylor ◽  
Sayantan Bhattacharya ◽  
Thomas S. Miller ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
2D Materials ◽  
Carbon Nitrides

The spontaneous dissolution of 2D carbon nitrides with polytriazine imide (PTI) diverges dramatically from the inherent insolubility of other 2D materials such as graphene. The dissolution may be controlled to give tuneable photoluminescence.

scholarly journals Formation of an ion-free crystalline carbon nitride and its reversible intercalation with ionic species and molecular water

2019 ◽  
Vol 10 (8) ◽  
pp. 2519-2528 ◽  
Author(s):  
Theo M. Suter ◽  
Thomas S. Miller ◽  
Jeremy K. Cockcroft ◽  
Abil E. Aliev ◽  
Martin C. Wilding ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Carbon Nitride ◽  
Exchange Process ◽  
Ionic Species ◽  
Molecular Water ◽  
Ion Exchange Process ◽  
Carbon Nitrides

Crystalline layered carbon nitrides can be inter-converted by simple ion exchange process allowing their properties to be tuned.

Oxygen-doped and nitrogen vacancy co-modified carbon nitride for the efficient visible light photocatalytic hydrogen evolution

2020 ◽  
Vol 44 (38) ◽  
pp. 16320-16328 ◽  
Author(s):  
Yuanyuan Yang ◽  
Wenting Guo ◽  
Yunpu Zhai ◽  
Qianwei Jin ◽  
Hao Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Nitrogen Vacancy ◽  
Photocatalytic Hydrogen Evolution ◽  
Practical Applications ◽  
Carbon Nitrides ◽  
Visible Light Photocatalytic

Typical non-metallic semiconductor carbon nitrides (CNs) have enormous potential in the field of photocatalysis, but the easy recombination of the photo-generated charges severely limits their practical applications.

Emerging trends in sensors based on carbon nitride materials

The Analyst ◽  
2019 ◽  
Vol 144 (5) ◽  
pp. 1475-1491 ◽  
Author(s):  
Marilyn Mary Xavier ◽  
P. Radhakrishnan Nair ◽  
Suresh Mathew
Keyword(s):  
Carbon Nitride ◽  
Functional Materials ◽  
New Class ◽  
Emerging Trends ◽  
Carbon Nitrides ◽  
Carbon Nitride Materials

A new class of functional materials, carbon nitrides, has recently attracted the attention of researchers.

scholarly journals Solar Energy Harvesting with Carbon Nitrides: Do We Understand the Mechanism?

2018 ◽  
Author(s):  
Wolfgang Domcke ◽  
Johannes Ehrmaier ◽  
Andrzej L. Sobolewski
Keyword(s):  
Excited State ◽  
Solar Energy ◽  
Water Molecule ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydroxyl Radicals ◽  
Carbon Nitride ◽  
Carbon Nitrides ◽  
Polymeric Carbon ◽  
Carbon Nitride Materials

The photocatalytic splitting of water into molecular hydrogen and molecular oxygen with sunlight is the dream reaction for solar energy conversion. Since decades, transition-metal-oxide semiconductors and supramolecular organometallic structures have been extensively explored as photocatalysts for solar water splitting. More recently, polymeric carbon nitride materials consisting of triazine or heptazine building blocks have attracted considerable attention as hydrogen-evolution photocatalysts. The mechanism of hydrogen evolution with polymeric carbon nitrides is discussed throughout the current literature in terms of the familiar concepts developed for photoelectrochemical water splitting with semiconductors since the 1970s. We discuss in this perspective an alternative mechanistic paradigm for photoinduced water splitting with carbon nitrides, which focusses on the specific features of the photochemistry of aromatic N-heterocycles in aqueous environments. It is shown that a water molecule which is hydrogen-bonded to an N-heterocycle can be decomposed into hydrogen and hydroxyl radicals by two simple sequential photochemical reactions. This concept is illustrated by first-principles calculations of excited-state reaction paths and their energy profiles for hydrogen-bonded complexes of pyridine, triazine and heptazine with a water molecule. It is shown that the excited-state hydrogen-transfer and hydrogen-detachment reactions are essentially barrierless, in sharp contrast to water oxidation in the electronic ground state, where high barriers prevail. We also discuss in some detail the products of possible reactions of the highly reactive hydroxyl radicals with the chromophores. We hypothesize that the challenge of efficient solar hydrogen generation with carbon-nitride materials is less the decomposition of water as such, but rather the controlled recombination of the photogenerated radicals to the closed-shell products H2 and H2O2.

MOF-derived conductive carbon nitrides for separator-modified Li–S batteries and flexible supercapacitors

2020 ◽  
Vol 8 (4) ◽  
pp. 1757-1766 ◽  
Author(s):  
Jingsheng Cai ◽  
Yingze Song ◽  
Xiang Chen ◽  
Zhongti Sun ◽  
Yuyang Yi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Solid State ◽  
Nitrogen Content ◽  
Carbon Nitride ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Flexible Supercapacitors ◽  
Carbon Nitrides

MOF-derived carbon nitride with good electrical conductivity and high nitrogen content for flexible energy storages in separator-modified Li–S batteries and wearable quasi-solid-state supercapacitor devices.

Metal-Doped Carbon Nitrides: Synthesis, Structure and Applications

2021 ◽  
Author(s):  
Yuhan Bai ◽  
Yongjun Zheng ◽  
Zhuang Wang ◽  
Qing Hong ◽  
Songqin Liu ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Molecular Level ◽  
Wide Range ◽  
Carbon Nitrides ◽  
Common Strategy ◽  
Metal Doped ◽  
Carbon Nitride Materials

Doping of metal is a common strategy to regulate the structure of carbon nitride materials at the molecular level. A wide range of intriguing applications of metal-doped carbon nitride (M-CN)...

Ultrathin mesoporous graphitic carbon nitride nanosheets with functional cyano groups decoration and nitrogen vacancy defects for efficient selective CO2 photoreduction

Nanoscale ◽  
2021 ◽  
Author(s):  
Junyi Li ◽  
Xiaohan Wang ◽  
Liang Huang ◽  
Liang Tian ◽  
Menny Shalom ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Nitrogen Vacancy ◽  
Graphitic Carbon Nitride ◽  
Co2 Photoreduction ◽  
Vacancy Defects ◽  
Carbon Nitrides ◽  
Cyano Groups ◽  
Carbon Nitride Nanosheets

Graphitic carbon nitrides have photoreduction CO2 ability, but their activities are limited by the low potential and mobility of photogenerated carriers. Herein, ultrathin mesoporous graphitic carbon nitride nanosheets (CNNS) synchronously...

Oxidized Carbon Nitrides: Water-Dispersible, Atomically Thin Carbon Nitride-Based Nanodots and Their Performances as Bioimaging Probes

2015 ◽  
Vol 21 (16) ◽  
pp. 6241-6246 ◽  
Author(s):  
Junghoon Oh ◽  
Ran Ji Yoo ◽  
Seung Yeon Kim ◽  
Yong Jin Lee ◽  
Dong Wook Kim ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Water Dispersible ◽  
Thin Carbon ◽  
Carbon Nitrides ◽  
Oxidized Carbon
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