Regulating the Assembly of Precursors of Carbon Nitrides to Improve Photocatalytic Hydrogen Production

Abstract

Two-dimensional graphitic carbon nitrides (2D g-C3N4) are promising photocatalysts for water splitting to hydrogen due to their non-toxicity and high stability. However, the bulk g-C3N4 has some intrinsic drawbacks, such as rapid electron–hole recombination and low charge-carrier mobility, resulting in poor photocatalytic activity. Here, 2,4-diamine-6-phenyl-1,3,5-triazine was employed as a precursor to regulating the assembly of melamine and cyanuric acid in water. The resulting g-C3N4 not only improved the visible light absorption and electron–hole separation but also provided more catalytic sites for enhanced photocatalytic hydrogen evolution. The modified g-C3N4 (CNP10-H) showed a hydrogen-releasing rate of 2184 μmol·g−1·h−1, much higher than the bulk g-C3N4.

Structural and Optical Characterization of g-C3N4 Nanosheet Integrated PVC/PVP Polymer Nanocomposites

“…Every carbon atom forms a large planar network structure owing to covalent bonding with three nitrogen atoms. The g-C 3 N 4 is a common kind of carbon nitride that has been extensively utilized in catalysis [ 15 , 16 , 17 ]. Graphitic carbon nitride is a well-known organic semiconductor with distinct electronic, optical, and mechanical properties.…”

Construction of Co3(PO4)2/g-C3N4 nanowire composites to boost visible-light-driven photocatalysis

“…Various strategies were carried out to improve the photocatalytic activity, including element doping, nanostructure formation, and heterojunction construction. [5][6][7][8][9][10][11][12] Designing g-C 3 N 4 heterojunction composites by hybridizing other semiconductors with appropriate conduction band and valence band potentials remains a promising method to further improve the photocatalytic activity.…”

Electrocatalytic activity of MoSi2N4 monolayers decorated with single transition metal atoms: a computational study

“…A viable answer to the present energy issues is water splitting [3]. It is well known that OER, HER, the structure stability and physical properties of Low-dimensional material are the key to electrocatalytic water splitting [4][5][6]. However, most known catalysts are suffering from problems such as high overpotential and low conversion rate, thus severely limiting the large-scale commercial applications [7][8][9].…”