Green radicals of potassium poly(heptazine imide) using light and benzylamine

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  • Yevheniia Markushyna, Max Planck Institute of Colloids and Interfaces
  • ,
  • Paolo Lamagni, Max Planck Institute of Colloids and Interfaces
  • ,
  • Christian Teutloff, Freie Universitaet Berlin
  • ,
  • Jacopo Catalano
  • Nina Lock
  • Guigang Zhang, Max Planck Institute of Colloids and Interfaces
  • ,
  • Markus Antonietti, Max Planck Institute of Colloids and Interfaces
  • ,
  • Aleksandr Savateev, Max Planck Institute of Colloids and Interfaces

Tinted long-lived ionic carbon nitride radicals were recently introduced and applied in photocatalysis and energy storage. However, the reason for their higher activity in the photocatalytic reaction and optimal conditions for generating such radicals remain vague. Herein, we study the conditions for carbon nitride photocharging to achieve a higher charge density and validate a convenient method to quantify the number of electrons accumulated in carbon nitride semiconductors by quenching its radicals with methylviologen in the dark. In the presence of CO 2, potassium poly(heptazine imide) (K-PHI) can be charged by up to 1000 μmol of electrons per gram of the material using benzylamine as an electron donor. Under the same conditions, mesoporous graphitic carbon nitride can accumulate only 50 μmol of electrons per gram. The products of the benzylamine oxidative coupling are imine and ammonia.

Original languageEnglish
JournalJournal of Materials Chemistry A
Volume7
Issue43
Pages (from-to)24771-24775
Number of pages5
ISSN2050-7488
DOIs
Publication statusPublished - Nov 2019

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