A carbon membrane-mediated CdSe and TiO₂ nanofiber film for enhanced photoelectrochemical degradation of methylene blue

Abstract

A CdSe/C/TiO2 nanofiber film was prepared for enhanced photoelectrochemical degradation ability, and carbon membrane as a carrier-transfer-channel could promote electron transfer.

Photocatalytic hydrogen evolution over cyanine-sensitized Ag/TiO2

“…According to these results, it is expected that the resistance of the dyesensitized TiO 2 is the lowest and the charge transfer is the fastest, and therefore the probability of the recombination of charge carriers would be the lowest in C2/Ag/TiO 2 , as displayed by the photocatalytic hydrogen production. 72,73 Additionally, the four prepared cyanine sensitized photocatalysts may differ in incident photo-to-electric conversion efficiency (IPECE), which may act as an indicator of the rate of the back reaction between injected electrons and the excited state of the dye. 71 Silver as noble metal nanoparticles can act as photogenerated electron trapping sites, and then reduce the electronhole recombination compared with the bare TiO 2 , the absorption of Ag/TiO 2 shied to a longer wavelength (towards the visible region) due to the localized surface plasmon resonance (LSPR) of the Ag NPs.…”

“…According to these results, it is expected that the resistance of the dye-sensitized TiO 2 is the lowest and the charge transfer is the fastest, and therefore the probability of the recombination of charge carriers would be the lowest in C2 /Ag/TiO 2 , as displayed by the photocatalytic hydrogen production. 72,73 Additionally, the four prepared cyanine sensitized photocatalysts may differ in incident photo-to-electric conversion efficiency (IPECE), which may act as an indicator of the rate of the back reaction between injected electrons and the excited state of the dye. 71…”

Y2O3:Yb3+, Tm3+/ZnO composite with a heterojunction structure and upconversion function for the photocatalytic degradation of organic dyes

“…As a green and renewable energy, solar energy has been widely used by humankind and is expected to solve critical problems related to energy shortage and environmental pollution. However, due to the limitation of excitation light source energy, such as photocatalysis, bioapplications, and photodynamic medical technology, [1][2][3][4][5][6] it can only use about 50% of the visible light of sunlight, and even 4-5% of ultraviolet (UV) light, 7 signicantly limiting applications and reducing the utilization efficiency of solar energy. Upconverting technology (UPT) can convert two or more low-energy photons in the light source into one high-energy photon, [8][9][10][11][12][13] realizing the conversion of lowenergy light to high-energy light.…”