High activity of Ag-doped Cd_0.1Zn_0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation

Abstract

Summary Background: The hydrothermal method was used as a new approach to prepare a series of Ag-doped Cd0.1Zn0.9S photocatalysts. The effect of Ag doping on the properties and photocatalytic activity of Cd0.1Zn0.9S was studied for the hydrogen production from water reduction under visible light irradiation. Results: Compared to the series prepared by the co-precipitation method, samples prepared by the hydrothermal method performed with a better photocatalytic activity. The sample with the optimum amount of Ag doping showed the highest hydrogen production rate of 3.91 mmol/h, which was 1.7 times higher than that of undoped Cd0.1Zn0.9S. With the Ag doping, a red shift in the optical response was observed, leading to a larger portion of the visible light absorption than that of without doping. In addition to the larger absorption in the visible-light region, the increase in photocatalytic activity of samples with Ag doping may also come from the Ag species facilitating electron–hole separation. Conclusion: This study demonstrated that Ag doping is a promising way to enhance the activity of Cd0.1Zn0.9S photocatalyst.

Nanocomposite heterojunctions as sunlight-driven photocatalysts for hydrogen production from water splitting

“…In addition to a solid solution, CdS can mix with other metal sulfides in order to increase hydrogen production under visible light irradiation. 105,[117][118][119] For instance, TiS 2 and TaS 2 are both semiconductors with small band gaps less than 1 eV. A nano-layer combination of one of these two semiconductors with nanoparticles of CdS resulted in highly efficient photocatalysts for H 2 evolution from an aqueous solution of benzyl alcohol.…”

Improvement of hydrogen evolution under visible light over Zn1−2x(CuGa)xGa2S4photocatalysts by synthesis utilizing a polymerizable complex method

“…However, most of them are synthesized by SSR, which might not be the optimized approach. There are several homogeneous methods to prepare suldes which lead to higher performance, [47][48][49][50] however these methods are usually limited to simple suldes such as CdS and ZnS. Few homogeneous methods have been reported for the synthesis of complex suldes.…”

One-pot synthesis of Ag-MWCNT@TiO2 core–shell nanocomposites for photocatalytic reduction of CO2 with water under visible light irradiation

“…The small shifting of less than 0.1°suggesting that one-pot synthesis allows Ag to be doped into TiO 2 lattice with minimal crystal distortion. Similar finding was also reported in [12]. The crystallite size of the TiO 2 was estimated based on Scherrer's equation.…”

“…Distinctive diffraction peak for MWCNT was not assigned to any of the peaks in the XRD patterns due to the close diffraction peaks of MWCNTs and anatase TiO 2 (1 0 1), i.e., 25.2°a nd 26.0°, respectively [4,11]. In addition, no significant diffraction peaks of Ag were noticeable, which is a result of the small Ag content and highly dispersion of Ag dopants over the MWCNT@TiO 2 core-shell nanocomposites [12].…”