Effect of deposition method on metal loading and photocatalytic activity of Au/CdS for hydrogen production in water electrolyte mixture

Optimizing the precursor of sulfur source for hydrothermal synthesis of high performance CdS for photocatalytic hydrogen production

“…The sulfation of CdS is further conrmed by the FTIR results as the bands at 2926 and 2857 cm À1 can be observed, which can be assigned to the asymmetric and symmetric stretching vibration of Cd-O, respectively. 57 The bending vibration of N-H and the stretching vibration of C-N (around 1100 and 1500 cm À1 , respectively 64,65 ) have not been observed, eliminating the possibility of the sulfur precursors adsorbing on the samples surface. Thus, it can deduce that there is no signicant difference in the surface structure of the synthesized CdS samples.…”

“…These peaks can be ascribed to SO 4 2À or SO 3 2À species. 57,58 It suggests that an oxidation of the CdS surface occurred during the hydrothermal treatment, which results in the fact that the actual atomic ratio of S is slightly less than the theoretical value as shown in Table 1. Our previous work 59 indicated that the formation of these oxides can be avoided by a solvothermal preparation method with ethanediamine as a solvent.…”

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

“…The precipitation of yellow colored polysulfide ions diminishes the photocatalytic efficiency via acting as an optical filter and competing with the H 2 generation reaction. This could be restricted by the addition of Na 2 SO 3 to generate more HSand S 2 O 3 2− ions to enhance the photocatalytic activity [292]. However, the results shown in Figure 4 suggest that H 2 production efficiency of Na 2 S/CdS or CdS/Na 2 SO 3 are higher than that of CdS/Na 2 S/Na 2 SO 3 .…”

Oriented p–n Heterojunction Ag2O/Zn(O,S) Nanodiodes on Mesoporous SiO2 for Photocatalytic Hydrogen Production

“…After the invention of Honda and Fujishima for photoelectrochemical water splitting in 1972, numerous semiconductor materials have been reported in previous works. − However, most of them have low efficiency because the electron–hole pairs rapidly recombine after photoexcitation process. To overcome this critical issue, surface modification by loading cocatalyst, heterojunction formation, and the introduction of sacrificial reagent have been widely and extensively conducted. − …”