Gradual carbon doping of graphitic carbon nitride towards metal-free visible light photocatalytic hydrogen evolution

Abstract

A novel hydrothermal-conjugate-copolymerization strategy has been developed for the preparation of a carbon-rich g-C3N4 photocatalyst.

Current understanding and challenges of solar-driven hydrogen generation using polymeric photocatalysts

“…A range of synthetic modifications to promote, for example, charge separation, have been proposed 38 and used to achieve higher AQYs (generally for light in the range of 395~420 nm). Such engineering strategies include increasing the degree of polymerisation 36 , nanosheet fabrication 39 , use of templates 40 , fabrication in molten salts 41 , creating p-n homojunction 42 , and selective doping 43,44 . Another emerging approach to control the properties of CN x H y is the utilisation of selfassembled supramolecular structures as reactants [45][46][47][48] , such as using of halogen-based assemblies [49][50][51][52] and supramolecular single crystals [53][54][55] .…”

Graphitic Carbon Nitride (g‐C3N4) Nanosheets as a Multipurpose Material for Detection of Amines and Solar‐Driven Hydrogen Production

“…Due to NaCl/KCl assisted calcination, the as‐synthesized CN−KNa photocatalyst progressed an enhanced absorption edge with a slight red‐shift toward a more extended wavelength region, suggesting a modification in the bandgap structure. The estimated bandgap energy from Kubelka‐Munk function [29] and Tauc plots [30] is 2.65 and 2.75 eV for CN−KNa and bulk CN samples (Figure 2(b)), respectively. Furthermore, the relative conduction band positions of the CN−KNa and bulk CN samples were correspondingly determined to be −0.15 and −0.22 eV by Mott‐Schottky plots, [31] as shown in Figure 2(c).…”

Facile assembly of a graphitic carbon nitride film at an air/water interface for photoelectrochemical NADH regeneration

“…The broad band between 2900 and 3600 cm −1 can be attributed to N-H stretching vibrations. 29,30 Fig. 2b shows that the optical absorption edge of the CNS blue-shifts by 33 nm with a tail up to 439 nm, compared to that of the BCN (472 nm).…”

“…2b, inset). 30 Furthermore, the surface chemical compositions and bonding states of BCN and CNS were analyzed by XPS. The survey spectra (Fig.…”