Constructing carbon-nitride-based copolymers via Schiff base chemistry for visible-light photocatalytic hydrogen evolution

Defective graphitic carbon nitride synthesized by controllable co-polymerization with enhanced visible light photocatalytic hydrogen evolution

“…55,56 It can be concluded from above results that introducing defects in polymeric g-C 3 N 4 by copolymerization can effectively facilitate the separation and transfer of excitons, which is eventually beneficial to electron transfer in photocatalytic hydrogen generation. 57 Considering the advantages of this modified g-C 3 N 4 , such as wide visible light absorption range, larger surface areas and suitable edge for hydrogen evolution, we evaluated the photocatalytic hydrogen evolution of the modified g-C 3 N 4 photocatalysts in aqueous solution. 25 As shown in Figure 8a, the amounts of produced H 2 increase linearly with the irradiation time lasting.…”

Fabrication of conductive and high-dispersed Ppy@Ag/g-C3N4 composite photocatalysts for removing various pollutants in water

“…Among the various photocatalysts, the polymeric graphitic-like carbon nitride (g-C 3 N 4 ) has been more and more widely concerned due to its unique inherent characteristic. For example, Wang et al have reported that g-C 3 N 4 displayed good photocatalytic performance for hydrogen production by water splitting under visible light [5][6][7]. All of them can prove that the g-C 3 N 4 semiconductor has the characteristics of visible-light absorbing ability, excellent photocatalytic activity and photochemical stability [8][9][10].…”

Carbonyl‐Grafted g‐C3N4 Porous Nanosheets for Efficient Photocatalytic Hydrogen Evolution

“…Since Wang et al reported graphitic carbon nitride( g-C 3 N 4 ), am etal-free polymer semiconductor that is able to produce hydrogen or oxygen by splitting water under visible-light irradiation, [17] g-C 3 N 4 has attracted more and more attention for its application in supercapacitors, [18] lithiumion batteries, [19] photodegradation of pollutants, [20,21] and especially in photocatalytic hydrogen production. [26] Up to now,s everal approaches have been explored to improve the visible-light utilization of g-C 3 N 4 to achieve high photocatalytic activity,i ncluding doping with metal and/or nonmetal ions, [27][28][29][30][31][32] construction of heterojunctions with other semiconductors, [20,21,25,[33][34][35] copolymerization with organic molecules, [35][36][37][38][39] modification with carbon materials, [40][41][42] co-catalyst deposition, [43,44] thin-film fabrication, [45] and photosensitization with dyes. However, pristine g-C 3 N 4 exhibits limited photocatalytic activity owing to its small specific surface area, poor visible-light utilization, and fast recombination of photogenerated electrons and holes.…”