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Two Ways to more NH~2~-Groups: Formation of Polymeric Carbon Nitride via Melem Tetramer Nano Sheets or Supramolecular Assembly of Melamine and Cyanuric Acid for Applications as Photocatalyst by Marco Weers; Aaron R. von Seggern; Heinrich Vocke; Dereje H. Taffa; Michael Wark is a Materials Science article available to read on EtoBox.

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Polymeric carbon nitride (PCN) can be prepared by heating of nitrogen rich precursors and is used as a photocatalyst for hydrogen evolution and transformation of organic molecules. This work gives a deeper understanding of the different properties of PCN and the observed intermediates when melamine or urea are chosen as precursors and heated to temperatures in the range of 350-575 °C. Melem or a melem-tetramer are the main intermediates when melamine is used as starting material, while urea-based PCN is formed via a supramolecular assembly of melamine and cyanuric acid. This leads to crucial differences in properties such as surface area, amount of NH 2 -groups and photocatalytic activity. PCN from urea, loaded with Pt nanoparticles, shows higher activities for photocatalytic hydrogen evolution due to more NH 2 -groups. The melem-tetramer shows nanosheetlike structure combined with a high amount of NH 2groups and has the highest activity of all prepared catalysts for the photocatalytic reduction of 5-(hydroxymethyl)furfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF). Thus, this research demonstrates the formation mechanism and the design of PCN based catalysts with a large amount

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Author

Marco Weers; Aaron R. von Seggern; Heinrich Vocke; Dereje H. Taffa; Michael Wark

Publisher

American Chemical Society (ACS)

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)