Enhanced photoelectrochemical cathodic protection performance of g-C3N4 caused by the co-modification with N defects and C deposition

Photoassisted Charging of Li-Ion Oxygen Batteries Using g-C3N4/rGO Nanocomposite Photocatalysts

“…The performance of the g-C 3 N 4 as the photocatalyst in the reduction of the charging potential of the Li-ion oxygen battery was extraordinary . Indeed, g-C 3 N 4 , a nonmetallic semiconductor, has been explored extensively as a visible-light-active photocatalyst since it is well known with a relatively small band gap, cost efficiency, and thermal and chemical stabilities. − The poor electrical conductivity and the severe recombination of the photogenerated electron–hole pairs, however, limit the large-scale applications of g-C 3 N 4 The synthesis of g-C 3 N 4 -based nanocomposites is accepted as the main strategy to eliminate these handicaps and improve the visible light absorption performance of g-C 3 N 4 . − Especially due to the similar carbon network and sp 2 -conjugated π structure, graphene and g-C 3 N 4 are considered to be the most compatible materials to form nanocomposites. ,,− The reduced graphene oxide (rGO) has an additional advantage over graphene or doped graphene due to the presence of oxygen-rich active sites on it since these active sites result in the formation of novel covalent bonds in the nanocomposites. ,, It is reported that the band gap, CB edge potential, and thus the valance band (VB) edge potential of g-C 3 N 4 can be tuned effectively by intercalation of various amounts of the rGO. , More specifically, the narrowed band gap due to the red shift of the absorption band edges, the positively shifted VB edge potential, and the enhanced electronic conductivity cause the improved photocatalytic activity to better utilize visible light and increase the oxidation power upon the synthesis of the g-C 3 N 4 /rGO nanocomposites. , The red shift of the absorption band edges was also reported in TiO 2 /rGO nanocomposites …”

Review—Photoelectrochemical Cathodic Protection in The Dark: A Review of Nanocomposite and Energy-Storing Photoanodes

“…g-C 3 N 4 : The graphitic carbon nitride (g-C 3 N 4 ), the best stable CN allotrope was recently employed widely in PECP application. [211][212][213][214][215][216][217][218] The band gap of condensed g-C 3 N 4 is ∼2.7 eV. In addition to providing PECP, a g-C 3 N 4 surface coating could also offer ample barrier effect due to its excellent acid/alkali resistance, anti-abrasion/ erosion properties, and high thermal resistance.…”

“…214 N and C co-modified g-C 3 N 4 (C-g-C 3 N x ) was studied for PECP. 212 The N defects altered the band structure of g-C 3 N 4 by letting down CB level and extended the light absorption and enhanced charge transfer and separation. The composite delivered a current density of 9.1 μA•cm −2 , which was ∼3 times that of bare g-C 3 N 4 .…”

Photocatalytic Efficiency of g-C3N4/Graphene Nanocomposites in the Photo-Assisted Charging of the Li-Ion Oxygen Battery

“…Two-dimensional (2D) materials and their composites are expected to make a significant impact on the advancement of the energy conversion and storage technologies. , Graphitic carbon nitride (g-C 3 N 4 ), a 2D nonmetallic semiconductor, is a very promising photocatalyst owing to its convenient light harvesting band gap (2.7 eV), good physicochemical stability, and easy and low-cost synthesis. − However, the severe recombination of the photogenerated electron–hole pairs, low surface area, and low electrical conductivity restrict its application . The synthesis of g-C 3 N 4 -based nanocomposites with the carbonaceous nanomaterials is accepted as the most effective pathway to overcome these handicaps since they are the most compatible constituents of the nanocomposites due to their similar carbon network and sp 2 -conjugated π structure. − …”

“…10−14 However, the severe recombination of the photogenerated electron−hole pairs, low surface area, and low electrical conductivity restrict its application. 15 The synthesis of g-C 3 N 4 -based nanocomposites with the carbonaceous nanomaterials is accepted as the most effective pathway to overcome these handicaps since they are the most compatible constituents of the nanocomposites due to their similar carbon network and sp 2 -conjugated π structure. 16−24 Graphene, a 2D single-layer sheet of sp 2 -hybridized carbon atoms, attracts worldwide research interest due to its exceptional physical properties.…”