Enhanced visible-light photocatalytic hydrogen evolution activity of Er3+:Y3Al5O12/PdS–ZnS by conduction band co-catalysts (MoO2, MoS2 and MoSe2)

Abstract

Several conduction band co-catalysts (CBCOs), MoO2, MoS2 and MoSe2, were prepared to improve the visible-light photocatalytic hydrogen evolution activity of Er 3+ :Y3Al5O12/PdS-ZnS from water splitting, in which the PdS is a valence band co-catalyst (VBCO) used to facilitate the photo-generated hole transfer and the Er 3+ :Y3Al5O12 is an up-conversion luminescence agent from visible light to ultraviolet light used to provide the ultraviolet light satisfying the energy demands of wide band-gap ZnS photocatalyst. XRD, SEM, TEM and EDX analyses were employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. UV-vis absorption and PL spectra were also determined to explore luminescence effect of the Er 3+ :Y3Al5O12. The visible-light photocatalytic hydrogen evolution activity of the prepared photocatalysts was evaluated by using Na2S and Na2SO3 as sacrificial reagents in aqueous solution under visible light irradiation. The influential factors such as contents of CBCOs (MoO2, MoS2 and MoSe2) and visible-light irradiation time on visible-light photocatalytic hydrogen evolution of Er 3+ :Y3Al5O12/PdS-ZnS-MoX2 (X = O, S and Se) were investigated in detail. Particularly, Er 3+ :Y3Al5O12/PdS-ZnS-MoSe2 with 0.30 wt% MoSe2 shows the highest

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

“…In particular, most of the research works have been carried out using powder photocatalysts (except photo-electrochemical studies). The reported materials in the recent years are categorized as oxide , carbon [3,81,, and sulfide [3,14,17,35,58,59,113,114,119,128,133,154,164,169,177,181,195,203,208,210,215,220,227,230,235, photocatalysts. Titanium oxide-P25 (TiO2-P25), graphitic carbon nitride (g-C3N4), and cadmium sulfide (CdS) are the most extensively studied photocatalysts for water splitting.…”

Novel Photocatalytic Nanocomposite Made of Polymeric Carbon Nitride and Metal Oxide Nanoparticles

“…In recent years, binary or ternary photocatalysts have attracted considerable attention owing to their favorable advanced oxidation processes under stimulated light [2,3]. Over the last few decades, numerous approaches have been developed to enhance the photocatalytic efficiency of a photocatalyst, including doping with various chemical elements (Cr, Fe, B, S) [4,5,6,7], incorporating co-catalysts [8], including oxides [9], or the coupling of two or more semiconductors. Some of these have shown promising photocatalytic activities for the degradation of toxic pollutants under visible light irradiation because of their structural features and suitable band gaps in the range of 1.7–3 eV.…”

Defect dipoles and stable dielectric properties improve Nb-doped Ba0.7Sr0.3TiO3 photocatalytic H2 evolution activity

“…Therefore, 1.0Nb–BST possesses superior thermodynamic advantages in photocatalytic hydrogen evolution. 54,55…”

“…Therefore, 1.0Nb-BST possesses superior thermodynamic advantages in photocatalytic hydrogen evolution. 54,55 3.5. Improved photocatalytic H 2 evolution by defect dipoles and stable dielectric properties Excitingly, the generation of defect dipoles improves the electron mobility of BST by reducing carrier recombination consistent with previous speculation (Fig.…”