The utilization of non-precious and noble-metal free catalysts for the photo conversion of water into hydrogen is of significant interest. In particular, the typical layered MoS2 has attracted interest as a low-cost alternative to platinum in the photocatalytic hydrogen evolution system. However, theoretical studies have suggested that the activity of the MoS2 co-catalyst arises only at the S sites on the edges of grains, and not on the basal planes. In this respect, the doping of a foreign metal into the MoS2 system is an interesting method for boosting the hydrogen production rate by increasing the conductivity and number of active sites. Herein, simple methods are used to decorate CdS nanorods with earth-abundant, few-layered zinc-doped MoS2 nanosheets (Zn-MoS2/CdS), and the so-obtained Zn-MoS2/CdS composite is used for the photocatalytic hydrogen evolution reaction under solar irradiation in the presence of lactic acid as a hole scavenger. Thus, the catalyst is shown to provide significant hydrogen generation activity, along with excellent and continuous photo stability for more than 60 h under optimal conditions. Moreover, the hydrogen evolution rate of the Zn-MoS2/CdS composite is up to ~75-fold greater than that of the pure CdS. The loading of Zn-MoS2 is shown to increase the synergistic effects of the photocatalyst due to the effective separation of charge carriers, extensive exposure of catalytic sites, and high dispersion of the few-layered Zn-MoS2. In addition, the stability of the optimized material is enhanced by the doping of Zn metal into the MoS2. To the best of our knowledge, the hydrogen evolution activity of the as-prepared composite is the highest ever reported for the CdS and single metal-doped MoS2-based catalysts. Hence, this type of Zn-MoS2/CdS composite is strongly believed to have great potential as a low-cost, highly-efficient, noble-metal free catalyst for the photocatalytic reduction of water.
|Journal||Journal of Alloys and Compounds|
|Publication status||Published - 2022 Apr 5|
Bibliographical noteFunding Information:
This work was supported by National Research Foundation of Korea (NRF) grants, funded by the Korean Government (MSIP) (2014R1A4A1001690 and 2016R1E1A1A01941978).
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korean Government ( 2020H1D3A1A02081461 and 2020R1A4A1017737 ).
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry