Publication date: 15th December 2025
Graphitic carbon nitrides absorb photons with wavelength shorter than approx. 450 nm. Absorption of such a photon produces short-lived electronically-excited state of the material. The excited state can oxidize and reduce certain chemical species that are available in the reaction mixture. When the reaction mixture contains only molecules able to donate electrons (easily oxidizable species) and it is free of electron acceptors, among which the most ubiquitous is O2, the excited state is quenched reductively. It leads to accumulation of electrons and charge-compensating cations in the material. This process – excitation of carbon nitride with light followed by its reductive quenching – is denoted as photocharging. Photocharging produces a state of carbon nitride carrying multiple uncoupled electrons. The talk offers a succinct overview of factors affecting the ability of carbon nitride to accumulate electrons via photocharging, such as type of electron donor and graphitic carbon nitride. Several examples of photocharged carbon nitride application as a reductant of organic and inorganic molecules in the dark are highlighted.
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