Photoactive materials with nanostructures, including nanofibers, nanosheets and nanotubes, have also been developed to improve photocatalytic activity.Īmong the photoactive materials, transition metal sulfides (such as CdS, Znln 2S 4 and iron group elements like Fe-, Ni- and Co-based sulfides ) with a relatively narrow bandgap are sensitive to most of the visible wavelength region. For instance, composites including Pt/TiO 2, BiOBr/Bi 2WO 6, g-C 3N 4/KTaO 3, Pt/ZnO, CdS/ZnS and Ag/CdS have been synthesized and have exhibited enhanced photocatalytic activity. Many efforts have been made to improve photoelectrochemical (PEC) water splitting efficiency using various modifications such as ion doping, heterostructure and loading co-catalysts, assemblies which have proved to be beneficial in suppressing the charge carrier recombination in photocatalytic materials. As a device for solar energy, the performance of photoanodes is reliant on their light absorption, charge carrier separation and catalysis/electrolyte diffusion. Photocatalytic water splitting is a good strategy for converting solar energy to chemical energy. Fujishima and Honda used TiO 2 as a photocatalyst to split water to produce oxygen and hydrogen under ultraviolet light radiation. Semiconductor photocatalysis is regarded as a potential green technology for mitigating the energy crisis. The energy crisis is one of the major social problems that various countries will encounter in the 21st century.
0 kommentar(er)
