Pharaoh's Serpents: New Insights into a Classic Carbon Nitride Material

Miller, Thomas S.; D'Aleo, Anita; Suter, Theo; Aliev, Abil E.; Sella, Andrea; McMillan, Paul F.

doi:10.1002/zaac.201700268

Cited by 13 publications

(10 citation statements)

References 45 publications

(218 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[ 28–30 ] This proton‐bonded carbon will result in a faster CP build up, leading to the clear shoulder peak in the 13 C CP/MAS spectra. [ 31 ] In addition, the partial substitution of CNH 2 terminal groups by CH groups in the heptazine units found in the 13 C CP/MAS spectra agrees reasonably with the increase in the C/N ratios in CN‐AN and CN‐LAN compared to PCN (Table 1).…”

Section: Resultssupporting

confidence: 73%

Bridging Functional Groups Governing the Charge Transfer Dynamic in an Amorphous Carbon Nitride Allotropic Heterojunction toward Efficient Solar Hydrogen Evolution

Huang

Hou

2020

Solar RRL

View full text Add to dashboard Cite

Modulation of the charge transfer dynamic in amorphous carbon nitride allotropic heterojunctions by an alternation in bridging functional groups for the heptazine-and triazine-based fragments is demonstrated to boost the photocatalytic activity for hydrogen evolution. Pyrimidine-bridged and NH-bridged amorphous carbon nitride allotropic heterojunctions are synthesized by thermal polycondensation of a supramolecular complex. Due to the improved charge separation efficiency and visible-light harvesting ability, both allotropic heterojunctions present more than tenfold enhanced photocatalytic activities for hydrogen evolution compared to the conventional heptazine-based carbon nitride under visible-light illumination. Moreover, the photocatalytic activity of the NHbridged carbon nitride allotropic heterojunction with type-II charge transfer dynamic is superior to the pyrimidine-bridged one with a Z-scheme characteristic. The findings in this study emphasize that the electronic structure at the heterojunction interface governed by the bridging group greatly influences the charge transfer dynamic and therefore is a crucial factor driving the photocatalytic activity of carbon nitride allotropic heterojunctions.

show abstract

Section: Resultssupporting

confidence: 73%

Bridging Functional Groups Governing the Charge Transfer Dynamic in an Amorphous Carbon Nitride Allotropic Heterojunction toward Efficient Solar Hydrogen Evolution

Huang

Hou

2020

Solar RRL

View full text Add to dashboard Cite

show abstract

“…Thus, the careful reexamination of the solvothermal method and the reaction product is necessary and essential for further scientific and industrial applications of this carbon-and nitrogen-based nanomaterial. This may lead to new insights, such as recently reported work by Miller et al [33] who reexamined the classic "Pharaoh's serpent reaction," in which mercury (II) thiocyanate decomposes to HgS, CS 2 , and g-C 3 N 4 through the self-propagating combustion reaction and found that the reaction results in the formation of unique nanocomposite semiconductor material composed of nano-HgS particles and a porous g-C 3 N 4 matrix. In the present study, we carefully synthesized "g-C 3 N 4 " by following the solvothermal method and examined the chemical and structural characteristics by means of various techniques in order to clarify the origin of hydrogen and the real process of the solvothermal reaction.…”

Section: Journal Of Materialsmentioning

confidence: 99%

Reexamination of Solvothermal Synthesis of Layered Carbon Nitride

Kojima

Ohfuji

2018

Journal of Materials

View full text Add to dashboard Cite

"Graphitic carbon nitride" synthesized by the solvothermal reaction between cyanuric chloride (C 3 N 3 Cl 3 ) and sodium amide (NaNH 2 ), which was one of the most common methods reported so far, was carefully examined by several analytical techniques for its chemical and structural characteristics. The chemical quantification by the electron microprobe and combustion methods showed that the product synthesized has a significant amount of hydrogen with a composition C 3 N 5 H 3 . Moreover, we found by FT-IR and IR-Raman measurements that the product consists mainly of stacked s-triazine units on the basis of the structural framework of cyanuric chloride, suggesting that s-triazine-based carbon nitride is more stable than heptazine-based one under a mild temperature condition (∼200 ∘ C). The present study clearly demonstrates that hydrogen-free, pure graphitic C 3 N 4 cannot be produced by the present solvothermal reaction proposed by the earlier study.

show abstract

“…Research into solid state and polymeric carbon nitride compounds began in the early to mid-1800s as chemists including Berzelius, Wohler and Liebig first sought to expand and establish the field of cyanogen chemistry [14,67]. The earliest studies concerned the thermal decomposition of Hg(SCN) 2 leading to an H-free phase predicted to have C 3 N 4 stoichiometry.…”

Section: High-density Carbon Nitridesmentioning

confidence: 99%

New nitrides: from high pressure–high temperature synthesis to layered nanomaterials and energy applications

McMillan

2019

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

We describe work carried out within our group to explore new transition metal and main group nitride phases synthesized using high pressure–high temperature techniques using X-ray diffraction and spectroscopy at synchrotron sources in the USA, UK and France to establish their structures and physical properties. Along with previously published data, we also highlight additional results that have not been presented elsewhere and that represent new areas for further exploration. We also describe new work being carried out to explore the properties of carbon nitride materials being developed for energy applications and the nature of few-layered carbon nitride nanomaterials with atomically ordered structures that form solutions in polar liquids via thermodynamically driven exfoliation. This article is part of the theme issue ‘Fifty years of synchrotron science: achievements and opportunities’.

show abstract

Pharaoh's Serpents: New Insights into a Classic Carbon Nitride Material

Cited by 13 publications

References 45 publications

Bridging Functional Groups Governing the Charge Transfer Dynamic in an Amorphous Carbon Nitride Allotropic Heterojunction toward Efficient Solar Hydrogen Evolution

Bridging Functional Groups Governing the Charge Transfer Dynamic in an Amorphous Carbon Nitride Allotropic Heterojunction toward Efficient Solar Hydrogen Evolution

Reexamination of Solvothermal Synthesis of Layered Carbon Nitride

New nitrides: from high pressure–high temperature synthesis to layered nanomaterials and energy applications

Contact Info

Product

Resources

About