Phosphorus doped and defect modified graphitic carbon nitride for boosting photocatalytic hydrogen production

Abstract

The enhancement of photogenerated carrier separation efficiency is a significant factor in the performance improvement of photocatalysts in photocatalytic hydrogen evolution. Heteroatom doped and defect construction have been considered a...

Cyano‐Rich g‐C3N4 in Photochemistry: Design, Applications, and Prospects

“…At present, the molten salt method has become one of the overriding means to synthesize cyano‐rich g‐C 3 N 4 . Currently, the main method used is to mix two or more alkali metal salts (KCl/LiCl (most), KCl/LiBr, NaCl/LiCl, LiI/KI, LiBr/KBr, KCl/KSCN, KCl/KOCN, LiCl/KSCN, KI/LiI, KCl/NaCl/LiCl) with the precursors (melamine, urea, dicyandiamide, CH 5 N 3 ·HCl, guanidine hydrochloride, NH 4 SCN, carbohydrazide) or synthetic intermediate or original carbon nitride uniformly, [ 33,40,49,56–81 ] and then heat them in a tube furnace (Air, Ar or N 2 ) or muffle furnace to a certain temperature (450–650 °C) to react for a period of time, and then wash off the salts with hot water, and finally obtain the sample by drying. In this process, alkali metal salts can play the role of a class of template agent, speed up the reaction rate, make the sample more homogeneous, improve the crystallinity of the sample, etc.…”

Effect of molten-salt modulation on the composition and structure of g-C3N4-based photocatalysts

“…The optical absorption and redox property of g-C 3 N 4 -based photocatalysts can be adjusted by elemental doping to optimize the electronic structure and band structure. [35][36][37][38] In recent years, huge efforts have been made via elemental doping through molten-salt mediation. [39][40][41] Chen et al 42 developed homogeneous boron-doped crystalline g-C 3 N 4 nanocrystals by means of thermal polycondensation of melamine and boron oxide (B 2 O 3 ) in the presence of LiCl, NaCl, and KCl to degrade methyl orange (MO) solution under visible-light irradiation.…”

PtCu nanoalloy loaded on sulfur-doped porous g-C3N4 for electrocatalytic hydrogen evolution

“…The photocatalytic efficiency was 57 times that of bulk g-C 3 N 4 under the same conditions. It has been proved that doping atoms such as B, 25 S, 26 and P 27 into g-C 3 N 4 can optimize the energy level structure and improve the catalytic activity. Alharthi 28 used a one-pot method to prepare sulfur-doped g-C 3 N 4 (S-C 3 N 4 ).…”